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2025-04-01Revert "objtool: Increase per-function WARN_FUNC() rate limit"Josh Poimboeuf
This reverts commit 0a7fb6f07e3ad497d31ae9a2082d2cacab43d54a. The "skipping duplicate warnings" warning is technically not an actual warning, which can cause confusion. This feature isn't all that useful anyway. It's exceedingly rare for a function to have more than one unrelated warning. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/e5abe5e858acf1a9207a5dfa0f37d17ac9dca872.1743481539.git.jpoimboe@kernel.org
2025-04-01objtool: Append "()" to function name in "unexpected end of section" warningJosh Poimboeuf
Append with "()" to clarify it's a function. Before: vmlinux.o: warning: objtool: cdns_mrvl_xspi_setup_clock: unexpected end of section .text.cdns_mrvl_xspi_setup_clock After: vmlinux.o: warning: objtool: cdns_mrvl_xspi_setup_clock(): unexpected end of section .text.cdns_mrvl_xspi_setup_clock Fixes: c5995abe1547 ("objtool: Improve error handling") Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/692e1e0d0b15a71bd35c6b4b87f3c75cd5a57358.1743481539.git.jpoimboe@kernel.org
2025-04-01objtool: Ignore end-of-section jumps for KCOV/GCOVJosh Poimboeuf
When KCOV or GCOV is enabled, dead code can be left behind, in which case objtool silences unreachable and undefined behavior (fallthrough) warnings. Fallthrough warnings, and their variant "end of section" warnings, were silenced with the following commit: 6b023c784204 ("objtool: Silence more KCOV warnings") Another variant of a fallthrough warning is a jump to the end of a function. If that function happens to be at the end of a section, the jump destination doesn't actually exist. Normally that would be a fatal objtool error, but for KCOV/GCOV it's just another undefined behavior fallthrough. Silence it like the others. Fixes the following warning: drivers/iommu/dma-iommu.o: warning: objtool: iommu_dma_sw_msi+0x92: can't find jump dest instruction at .text+0x54d5 Fixes: 6b023c784204 ("objtool: Silence more KCOV warnings") Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/08fbe7d7e1e20612206f1df253077b94f178d93e.1743481539.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/314f8809-cd59-479b-97d7-49356bf1c8d1@infradead.org/
2025-04-01objtool: Silence more KCOV warnings, part 2Josh Poimboeuf
Similar to GCOV, KCOV can leave behind dead code and undefined behavior. Warnings related to those should be ignored. The previous commit: 6b023c784204 ("objtool: Silence more KCOV warnings") ... only did so for CONFIG_CGOV_KERNEL. Also do it for CONFIG_KCOV, but for real this time. Fixes the following warning: vmlinux.o: warning: objtool: synaptics_report_mt_data: unexpected end of section .text.synaptics_report_mt_data Fixes: 6b023c784204 ("objtool: Silence more KCOV warnings") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/a44ba16e194bcbc52c1cef3d3cd9051a62622723.1743481539.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503282236.UhfRsF3B-lkp@intel.com/
2025-03-28objtool, drm/vmwgfx: Don't ignore vmw_send_msg() for ORCJosh Poimboeuf
The following commit: 0b0d81e3b733 ("objtool, drm/vmwgfx: Fix "duplicate frame pointer save" warning") ... marked vmw_send_msg() STACK_FRAME_NON_STANDARD because it uses RBP in a non-standard way which violates frame pointer convention. That issue only affects the frame pointer unwinder. Remove the annotation for ORC. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/eff3102a7eeb77b4420fcb5e9d9cd9dd81d4514a.1743136205.git.jpoimboe@kernel.org
2025-03-28objtool: Fix STACK_FRAME_NON_STANDARD for cold subfunctionsJosh Poimboeuf
The recent STACK_FRAME_NON_STANDARD refactoring forgot about .cold subfunctions. They must also be ignored. Fixes the following warning: drivers/gpu/drm/vmwgfx/vmwgfx_msg.o: warning: objtool: vmw_recv_msg.cold+0x0: unreachable instruction Fixes: c84301d706c5 ("objtool: Ignore entire functions rather than instructions") Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/70a09ec0b0704398b2bbfb3153ce3d7cb8a381be.1743136205.git.jpoimboe@kernel.org
2025-03-28objtool: Fix segfault in ignore_unreachable_insn()Josh Poimboeuf
Check 'prev_insn' before dereferencing it. Fixes: bd841d6154f5 ("objtool: Fix CONFIG_UBSAN_TRAP unreachable warnings") Reported-by: Arnd Bergmann <arnd@arndb.de> Reported-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/5df4ff89c9e4b9e788b77b0531234ffa7ba03e9e.1743136205.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/d86b4cc6-0b97-4095-8793-a7384410b8ab@app.fastmail.com Closes: https://lore.kernel.org/Z-V_rruKY0-36pqA@gmail.com
2025-03-28objtool: Fix NULL printf() '%s' argument in builtin-check.c:save_argv()Josh Poimboeuf
It's probably not the best idea to pass a string pointer to printf() right after confirming said pointer is NULL. Fix the typo and use argv[i] instead. Fixes: c5995abe1547 ("objtool: Improve error handling") Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> Link: https://lore.kernel.org/r/a814ed8b08fb410be29498a20a5fbbb26e907ecf.1742952512.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/20250326103854.309e3c60@canb.auug.org.au
2025-03-28objtool, lkdtm: Obfuscate the do_nothing() pointerJosh Poimboeuf
If execute_location()'s memcpy of do_nothing() gets inlined and unrolled by the compiler, it copies one word at a time: mov 0x0(%rip),%rax R_X86_64_PC32 .text+0x1374 mov %rax,0x38(%rbx) mov 0x0(%rip),%rax R_X86_64_PC32 .text+0x136c mov %rax,0x30(%rbx) ... Those .text references point to the middle of the function, causing objtool to complain about their lack of ENDBR. Prevent that by resolving the function pointer at runtime rather than build time. This fixes the following warning: drivers/misc/lkdtm/lkdtm.o: warning: objtool: execute_location+0x23: relocation to !ENDBR: .text+0x1378 Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Kees Cook <kees@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/30b9abffbddeb43c4f6320b1270fa9b4d74c54ed.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503191453.uFfxQy5R-lkp@intel.com/
2025-03-25objtool, regulator: rk808: Remove potential undefined behavior in ↵Josh Poimboeuf
rk806_set_mode_dcdc() If 'ctr_bit' is negative, the shift counts become negative, causing a shift of bounds and undefined behavior. Presumably that's not possible in normal operation, but the code generation isn't optimal. And undefined behavior should be avoided regardless. Improve code generation and remove the undefined behavior by converting the signed variables to unsigned. Fixes the following warning with an UBSAN kernel: vmlinux.o: warning: objtool: rk806_set_mode_dcdc() falls through to next function rk806_get_mode_dcdc() vmlinux.o: warning: objtool: .text.rk806_set_mode_dcdc: unexpected end of section Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Mark Brown <broonie@kernel.org> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/2023abcddf3f524ba478d64339996f25dc4097d2.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503182350.52KeHGD4-lkp@intel.com/
2025-03-25objtool, ASoC: codecs: wcd934x: Remove potential undefined behavior in ↵Josh Poimboeuf
wcd934x_slim_irq_handler() If 'port_id' is negative, the shift counts in wcd934x_slim_irq_handler() also become negative, resulting in undefined behavior due to shift out of bounds. If I'm reading the code correctly, that appears to be not possible, but with KCOV enabled, Clang's range analysis isn't always able to determine that and generates undefined behavior. As a result the code generation isn't optimal, and undefined behavior should be avoided regardless. Improve code generation and remove the undefined behavior by converting the signed variables to unsigned. Fixes the following warning with UBSAN: sound/soc/codecs/snd-soc-wcd934x.o: warning: objtool: .text.wcd934x_slim_irq_handler: unexpected end of section Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Mark Brown <broonie@kernel.org> Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/7e863839ec7301bf9c0f429a03873d44e484c31c.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503180044.oH9gyPeg-lkp@intel.com/
2025-03-25objtool, Input: cyapa - Remove undefined behavior in cyapa_update_fw_store()Josh Poimboeuf
In cyapa_update_fw_store(), if 'count' is zero, the write to fw_name[count-1] underflows the array. Presumably that's not possible in normal operation, as its caller sysfs_kf_write() already checks for zero. Regardless it's a good idea to check for the error explicitly and avoid undefined behavior. Fixes the following warning with an UBSAN kernel: vmlinux.o: warning: objtool: .text.cyapa_update_fw_store: unexpected end of section Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/73ae0bb3c656735890d914b74c9d6bb40c25d3cd.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
2025-03-25objtool, panic: Disable SMAP in __stack_chk_fail()Josh Poimboeuf
__stack_chk_fail() can be called from uaccess-enabled code. Make sure uaccess gets disabled before calling panic(). Fixes the following warning: kernel/trace/trace_branch.o: error: objtool: ftrace_likely_update+0x1ea: call to __stack_chk_fail() with UACCESS enabled Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/a3e97e0119e1b04c725a8aa05f7bc83d98e657eb.1742852847.git.jpoimboe@kernel.org
2025-03-25objtool, media: dib8000: Prevent divide-by-zero in dib8000_set_dds()Josh Poimboeuf
If dib8000_set_dds()'s call to dib8000_read32() returns zero, the result is a divide-by-zero. Prevent that from happening. Fixes the following warning with an UBSAN kernel: drivers/media/dvb-frontends/dib8000.o: warning: objtool: dib8000_tune() falls through to next function dib8096p_cfg_DibRx() Fixes: 173a64cb3fcf ("[media] dib8000: enhancement") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/bd1d504d930ae3f073b1e071bcf62cae7708773c.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/r/202503210602.fvH5DO1i-lkp@intel.com/
2025-03-25objtool, nvmet: Fix out-of-bounds stack access in nvmet_ctrl_state_show()Josh Poimboeuf
The csts_state_names[] array only has six sparse entries, but the iteration code in nvmet_ctrl_state_show() iterates seven, resulting in a potential out-of-bounds stack read. Fix that. Fixes the following warning with an UBSAN kernel: vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section Fixes: 649fd41420a8 ("nvmet: add debugfs support") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Chaitanya Kulkarni <kch@nvidia.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/f1f60858ee7a941863dc7f5506c540cb9f97b5f6.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
2025-03-25objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()Josh Poimboeuf
If speed_hz < AMD_SPI_MIN_HZ, amd_set_spi_freq() iterates over the entire amd_spi_freq array without breaking out early, causing 'i' to go beyond the array bounds. Fix that by stopping the loop when it gets to the last entry, so the low speed_hz value gets clamped up to AMD_SPI_MIN_HZ. Fixes the following warning with an UBSAN kernel: drivers/spi/spi-amd.o: error: objtool: amd_set_spi_freq() falls through to next function amd_spi_set_opcode() Fixes: 3fe26121dc3a ("spi: amd: Configure device speed") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Mark Brown <broonie@kernel.org> Cc: Raju Rangoju <Raju.Rangoju@amd.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/78fef0f2434f35be9095bcc9ffa23dd8cab667b9.1742852847.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/r/202503161828.RUk9EhWx-lkp@intel.com/
2025-03-25objtool: Remove redundant opts.noinstr dependencyJosh Poimboeuf
The --noinstr dependecy on --link is already enforced in the cmdline arg parsing code. Remove the redundant check. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/0ead7ffa0f5be2e81aebbcc585e07b2c98702b44.1742852847.git.jpoimboe@kernel.org
2025-03-25objtool: Remove --no-unreachable for noinstr-only vmlinux.o runsJosh Poimboeuf
For (!X86_KERNEL_IBT && !LTO_CLANG && NOINSTR_VALIDATION), objtool runs on both translation units and vmlinux.o. The vmlinux.o run only does noinstr/noret validation. In that case --no-unreachable has no effect. Remove it. Note that for ((X86_KERNEL_IBT || LTO_CLANG) && KCOV), --no-unreachable still gets set in objtool-args-y by scripts/Makefile.lib. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/05414246a0124db2f21b0d071b652aa9043d039d.1742852847.git.jpoimboe@kernel.org
2025-03-25objtool: Fix up some outdated references to ENTRY/ENDPROCJosh Poimboeuf
ENTRY and ENDPROC were deprecated years ago and replaced with SYM_FUNC_{START,END}. Fix up a few outdated references in the objtool documentation and comments. Also fix a few typos. Suggested-by: Brendan Jackman <jackmanb@google.com> Suggested-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/5eb7e06e1a0e87aaeda8d583ab060e7638a6ea8e.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Reduce CONFIG_OBJTOOL_WERROR verbosityJosh Poimboeuf
Remove the following from CONFIG_OBJTOOL_WERROR: * backtrace * "upgraded warnings to errors" message * cmdline args This makes the default output less cluttered and makes it easier to spot the actual warnings. Note the above options are still are available with --verbose or OBJTOOL_VERBOSE=1. Also, do the cmdline arg printing on all warnings, regardless of werror. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/d61df69f64b396fa6b2a1335588aad7a34ea9e71.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Improve error handlingJosh Poimboeuf
Fix some error handling issues, improve error messages, properly distinguish betwee errors and warnings, and generally try to make all the error handling more consistent. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/3094bb4463dad29b6bd1bea03848d1571ace771c.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Properly disable uaccess validationJosh Poimboeuf
If opts.uaccess isn't set, the uaccess validation is disabled, but only partially: it doesn't read the uaccess_safe_builtin list but still tries to do the validation. Disable it completely to prevent false warnings. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/0e95581c1d2107fb5f59418edf2b26bba38b0cbb.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Silence more KCOV warningsJosh Poimboeuf
In the past there were issues with KCOV triggering unreachable instruction warnings, which is why unreachable warnings are now disabled with CONFIG_KCOV. Now some new KCOV warnings are showing up with GCC 14: vmlinux.o: warning: objtool: cpuset_write_resmask() falls through to next function cpuset_update_active_cpus.cold() drivers/usb/core/driver.o: error: objtool: usb_deregister() falls through to next function usb_match_device() sound/soc/codecs/snd-soc-wcd934x.o: warning: objtool: .text.wcd934x_slim_irq_handler: unexpected end of section All are caused by GCC KCOV not finishing an optimization, leaving behind a never-taken conditional branch to a basic block which falls through to the next function (or end of section). At a high level this is similar to the unreachable warnings mentioned above, in that KCOV isn't fully removing dead code. Treat it the same way by adding these to the list of warnings to ignore with CONFIG_KCOV. Reported-by: Ingo Molnar <mingo@kernel.org> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/66a61a0b65d74e072d3dc02384e395edb2adc3c5.1742852846.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/Z9iTsI09AEBlxlHC@gmail.com Closes: https://lore.kernel.org/oe-kbuild-all/202503180044.oH9gyPeg-lkp@intel.com/
2025-03-25objtool: Fix init_module() handlingJosh Poimboeuf
If IBT is enabled and a module uses the deprecated init_module() magic function name rather than module_init(fn), its ENDBR will get removed, causing an IBT failure during module load. Objtool does print an obscure warning, but then does nothing to either correct it or return an error. Improve the usefulness of the warning and return an error so it will at least fail the build with CONFIG_OBJTOOL_WERROR. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/366bfdbe92736cde9fb01d5d3eb9b98e9070a1ec.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Fix CONFIG_OBJTOOL_WERROR for vmlinux.oJosh Poimboeuf
With (!X86_KERNEL_IBT && !LTO_CLANG && NOINSTR_VALIDATION), objtool runs on both translation units and vmlinux.o. With CONFIG_OBJTOOL_WERROR, the TUs get --Werror but vmlinux.o doesn't. Fix that. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/4f71ab9b947ffc47b6a87dd3b9aff4bb32b36d0a.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Fix X86_FEATURE_SMAP alternative handlingJosh Poimboeuf
For X86_FEATURE_SMAP alternatives which replace NOP with STAC or CLAC, uaccess validation skips the NOP branch to avoid following impossible code paths, e.g. where a STAC would be patched but a CLAC wouldn't. However, it's not safe to assume an X86_FEATURE_SMAP alternative is patching STAC/CLAC. There can be other alternatives, like static_cpu_has(), where both branches need to be validated. Fix that by repurposing ANNOTATE_IGNORE_ALTERNATIVE for skipping either original instructions or new ones. This is a more generic approach which enables the removal of the feature checking hacks and the insn->ignore bit. Fixes the following warnings: arch/x86/mm/fault.o: warning: objtool: do_user_addr_fault+0x8ec: __stack_chk_fail() missing __noreturn in .c/.h or NORETURN() in noreturns.h arch/x86/mm/fault.o: warning: objtool: do_user_addr_fault+0x8f1: unreachable instruction [ mingo: Fix up conflicts with recent x86 changes. ] Fixes: ea24213d8088 ("objtool: Add UACCESS validation") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/de0621ca242130156a55d5d74fed86994dfa4c9c.1742852846.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503181736.zkZUBv4N-lkp@intel.com/
2025-03-25objtool: Ignore entire functions rather than instructionsJosh Poimboeuf
STACK_FRAME_NON_STANDARD applies to functions. Use a function-specific ignore attribute in preparation for getting rid of insn->ignore. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/4af13376567f83331a9372ae2bb25e11a3d0f055.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Warn when disabling unreachable warningsJosh Poimboeuf
Print a warning when disabling the unreachable warnings (due to a GCC bug). This will help determine if recent GCCs still have the issue and alert us if any other issues might be silently lurking behind the unreachable disablement. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/df243063787596e6031367e6659e7e43409d6c6d.1742852846.git.jpoimboe@kernel.org
2025-03-25objtool: Fix detection of consecutive jump tables on Clang 20Josh Poimboeuf
The jump table detection code assumes jump tables are in the same order as their corresponding indirect branches. That's apparently not always true with Clang 20. Fix that by changing how multiple jump tables are detected. In the first detection pass, mark the beginning of each jump table so the second pass can tell where one ends and the next one begins. Fixes the following warnings: vmlinux.o: warning: objtool: SiS_GetCRT2Ptr+0x1ad: stack state mismatch: cfa1=4+8 cfa2=5+16 sound/core/seq/snd-seq.o: warning: objtool: cc_ev_to_ump_midi2+0x589: return with modified stack frame Fixes: be2f0b1e1264 ("objtool: Get rid of reloc->jump_table_start") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/141752fff614eab962dba6bdfaa54aa67ff03bba.1742852846.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/ Closes: https://lore.kernel.org/oe-kbuild-all/202503200535.J3hAvcjw-lkp@intel.com/
2025-03-24x86 boot build: make git ignore stale 'tools' directoryLinus Torvalds
We've had this before: when we remove infrastructure to generate files, the old stale build artifacts still remain in-tree. And when the infrastructure to generate them is gone, so is the gitignore file for those build artifacts. End result: git will see the old generated files, and people will mistakenly commit them. That's what happened with the 'genheaders' file not that long ago (see commit 04a3389b3535 "Remove stale generated 'genheaders' file"). This time it's commit 9c54baab4401 ("x86/boot: Drop CRC-32 checksum and the build tool that generates it") that removed the 'build' file from the arch/x86/boot/tools/ subdirectory, and removed the .gitignore file too (because the whole subdirectory is gone). And as a result, if you don't do a 'git clean -dqfx' or similar to clean up your tree, 'git status' will say Untracked files: (use "git add <file>..." to include in what will be committed) arch/x86/boot/tools/ and some hapless sleep-deprived developer will inevitably decide that that means that they need to 'git add' that directory. Which would bring back some stale generated file that we most definitely do not want in the tree. So when removing directories that had special .gitignore patterns, make sure to add a new gitignore entry in the parent directory for the no longer existing subdirectory. It will avoid mistakes. Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Fixes: 9c54baab4401 ("x86/boot: Drop CRC-32 checksum and the build tool that generates it") Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2025-03-24Merge tag 'x86-platform-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 platform updates from Ingo Molnar: "Two small cleanups in the x86 platform support code" * tag 'x86-platform-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/platform/olpc: Remove unused variable 'len' in olpc_dt_compatible_match() x86/platform/olpc-xo1-sci: Don't include <linux/pm_wakeup.h> directly
2025-03-24Merge tag 'x86-sev-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 SEV updates from Ingo Molnar: - Improve sme_enable() PIC build robustness (Kevin Loughlin) - Simplify vc_handle_msr() a bit (Peng Hao) [ Just reminding myself and everybody else about the endless stream of x86 TLAs: "SEV" is AMD's Secure Encrypted Virtualization - Linus ] * tag 'x86-sev-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/sev: Simplify the code by removing unnecessary 'else' statement x86/sev: Add missing RIP_REL_REF() invocations during sme_enable()
2025-03-24Merge tag 'x86-cleanups-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 cleanups from Ingo Molnar: "Miscellaneous x86 cleanups by Arnd Bergmann, Charles Han, Mirsad Todorovac, Randy Dunlap, Thorsten Blum and Zhang Kunbo" * tag 'x86-cleanups-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/coco: Replace 'static const cc_mask' with the newly introduced cc_get_mask() function x86/delay: Fix inconsistent whitespace selftests/x86/syscall: Fix coccinelle WARNING recommending the use of ARRAY_SIZE() x86/platform: Fix missing declaration of 'x86_apple_machine' x86/irq: Fix missing declaration of 'io_apic_irqs' x86/usercopy: Fix kernel-doc func param name in clean_cache_range()'s description x86/apic: Use str_disabled_enabled() helper in print_ipi_mode()
2025-03-24Merge tag 'x86-fpu-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86/fpu updates from Ingo Molnar: - Improve crypto performance by making kernel-mode FPU reliably usable in softirqs ((Eric Biggers) - Fully optimize out WARN_ON_FPU() (Eric Biggers) - Initial steps to support Support Intel APX (Advanced Performance Extensions) (Chang S. Bae) - Fix KASAN for arch_dup_task_struct() (Benjamin Berg) - Refine and simplify the FPU magic number check during signal return (Chang S. Bae) - Fix inconsistencies in guest FPU xfeatures (Chao Gao, Stanislav Spassov) - selftests/x86/xstate: Introduce common code for testing extended states (Chang S. Bae) - Misc fixes and cleanups (Borislav Petkov, Colin Ian King, Uros Bizjak) * tag 'x86-fpu-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/fpu/xstate: Fix inconsistencies in guest FPU xfeatures x86/fpu: Clarify the "xa" symbolic name used in the XSTATE* macros x86/fpu: Use XSAVE{,OPT,C,S} and XRSTOR{,S} mnemonics in xstate.h x86/fpu: Improve crypto performance by making kernel-mode FPU reliably usable in softirqs x86/fpu/xstate: Simplify print_xstate_features() x86/fpu: Refine and simplify the magic number check during signal return selftests/x86/xstate: Fix spelling mistake "hader" -> "header" x86/fpu: Avoid copying dynamic FP state from init_task in arch_dup_task_struct() vmlinux.lds.h: Remove entry to place init_task onto init_stack selftests/x86/avx: Add AVX tests selftests/x86/xstate: Clarify supported xstates selftests/x86/xstate: Consolidate test invocations into a single entry selftests/x86/xstate: Introduce signal ABI test selftests/x86/xstate: Refactor ptrace ABI test selftests/x86/xstate: Refactor context switching test selftests/x86/xstate: Enumerate and name xstate components selftests/x86/xstate: Refactor XSAVE helpers for general use selftests/x86: Consolidate redundant signal helper functions x86/fpu: Fix guest FPU state buffer allocation size x86/fpu: Fully optimize out WARN_ON_FPU()
2025-03-24Merge tag 'x86-boot-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 boot code updates from Ingo Molnar: - Memblock setup and other early boot code cleanups (Mike Rapoport) - Export e820_table_kexec[] to sysfs (Dave Young) - Baby steps of adding relocate_kernel() debugging support (David Woodhouse) - Replace open-coded parity calculation with parity8() (Kuan-Wei Chiu) - Move the LA57 trampoline to separate source file (Ard Biesheuvel) - Misc micro-optimizations (Uros Bizjak) - Drop obsolete E820_TYPE_RESERVED_KERN and related code (Mike Rapoport) * tag 'x86-boot-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/kexec: Add relocate_kernel() debugging support: Load a GDT x86/boot: Move the LA57 trampoline to separate source file x86/boot: Do not test if AC and ID eflags are changeable on x86_64 x86/bootflag: Replace open-coded parity calculation with parity8() x86/bootflag: Micro-optimize sbf_write() x86/boot: Add missing has_cpuflag() prototype x86/kexec: Export e820_table_kexec[] to sysfs x86/boot: Change some static bootflag functions to bool x86/e820: Drop obsolete E820_TYPE_RESERVED_KERN and related code x86/boot: Split parsing of boot_params into the parse_boot_params() helper function x86/boot: Split kernel resources setup into the setup_kernel_resources() helper function x86/boot: Move setting of memblock parameters to e820__memblock_setup()
2025-03-24Merge tag 'x86-build-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 build updates from Ingo Molnar: - Drop CRC-32 checksum and the build tool that generates it (Ard Biesheuvel) - Fix broken copy command in genimage.sh when making isoimage (Nir Lichtman) * tag 'x86-build-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/boot: Add back some padding for the CRC-32 checksum x86/boot: Drop CRC-32 checksum and the build tool that generates it x86/build: Fix broken copy command in genimage.sh when making isoimage
2025-03-24Merge tag 'x86-core-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core x86 updates from Ingo Molnar: "x86 CPU features support: - Generate the <asm/cpufeaturemasks.h> header based on build config (H. Peter Anvin, Xin Li) - x86 CPUID parsing updates and fixes (Ahmed S. Darwish) - Introduce the 'setcpuid=' boot parameter (Brendan Jackman) - Enable modifying CPU bug flags with '{clear,set}puid=' (Brendan Jackman) - Utilize CPU-type for CPU matching (Pawan Gupta) - Warn about unmet CPU feature dependencies (Sohil Mehta) - Prepare for new Intel Family numbers (Sohil Mehta) Percpu code: - Standardize & reorganize the x86 percpu layout and related cleanups (Brian Gerst) - Convert the stackprotector canary to a regular percpu variable (Brian Gerst) - Add a percpu subsection for cache hot data (Brian Gerst) - Unify __pcpu_op{1,2}_N() macros to __pcpu_op_N() (Uros Bizjak) - Construct __percpu_seg_override from __percpu_seg (Uros Bizjak) MM: - Add support for broadcast TLB invalidation using AMD's INVLPGB instruction (Rik van Riel) - Rework ROX cache to avoid writable copy (Mike Rapoport) - PAT: restore large ROX pages after fragmentation (Kirill A. Shutemov, Mike Rapoport) - Make memremap(MEMREMAP_WB) map memory as encrypted by default (Kirill A. Shutemov) - Robustify page table initialization (Kirill A. Shutemov) - Fix flush_tlb_range() when used for zapping normal PMDs (Jann Horn) - Clear _PAGE_DIRTY for kernel mappings when we clear _PAGE_RW (Matthew Wilcox) KASLR: - x86/kaslr: Reduce KASLR entropy on most x86 systems, to support PCI BAR space beyond the 10TiB region (CONFIG_PCI_P2PDMA=y) (Balbir Singh) CPU bugs: - Implement FineIBT-BHI mitigation (Peter Zijlstra) - speculation: Simplify and make CALL_NOSPEC consistent (Pawan Gupta) - speculation: Add a conditional CS prefix to CALL_NOSPEC (Pawan Gupta) - RFDS: Exclude P-only parts from the RFDS affected list (Pawan Gupta) System calls: - Break up entry/common.c (Brian Gerst) - Move sysctls into arch/x86 (Joel Granados) Intel LAM support updates: (Maciej Wieczor-Retman) - selftests/lam: Move cpu_has_la57() to use cpuinfo flag - selftests/lam: Skip test if LAM is disabled - selftests/lam: Test get_user() LAM pointer handling AMD SMN access updates: - Add SMN offsets to exclusive region access (Mario Limonciello) - Add support for debugfs access to SMN registers (Mario Limonciello) - Have HSMP use SMN through AMD_NODE (Yazen Ghannam) Power management updates: (Patryk Wlazlyn) - Allow calling mwait_play_dead with an arbitrary hint - ACPI/processor_idle: Add FFH state handling - intel_idle: Provide the default enter_dead() handler - Eliminate mwait_play_dead_cpuid_hint() Build system: - Raise the minimum GCC version to 8.1 (Brian Gerst) - Raise the minimum LLVM version to 15.0.0 (Nathan Chancellor) Kconfig: (Arnd Bergmann) - Add cmpxchg8b support back to Geode CPUs - Drop 32-bit "bigsmp" machine support - Rework CONFIG_GENERIC_CPU compiler flags - Drop configuration options for early 64-bit CPUs - Remove CONFIG_HIGHMEM64G support - Drop CONFIG_SWIOTLB for PAE - Drop support for CONFIG_HIGHPTE - Document CONFIG_X86_INTEL_MID as 64-bit-only - Remove old STA2x11 support - Only allow CONFIG_EISA for 32-bit Headers: - Replace __ASSEMBLY__ with __ASSEMBLER__ in UAPI and non-UAPI headers (Thomas Huth) Assembly code & machine code patching: - x86/alternatives: Simplify alternative_call() interface (Josh Poimboeuf) - x86/alternatives: Simplify callthunk patching (Peter Zijlstra) - KVM: VMX: Use named operands in inline asm (Josh Poimboeuf) - x86/hyperv: Use named operands in inline asm (Josh Poimboeuf) - x86/traps: Cleanup and robustify decode_bug() (Peter Zijlstra) - x86/kexec: Merge x86_32 and x86_64 code using macros from <asm/asm.h> (Uros Bizjak) - Use named operands in inline asm (Uros Bizjak) - Improve performance by using asm_inline() for atomic locking instructions (Uros Bizjak) Earlyprintk: - Harden early_serial (Peter Zijlstra) NMI handler: - Add an emergency handler in nmi_desc & use it in nmi_shootdown_cpus() (Waiman Long) Miscellaneous fixes and cleanups: - by Ahmed S. Darwish, Andy Shevchenko, Ard Biesheuvel, Artem Bityutskiy, Borislav Petkov, Brendan Jackman, Brian Gerst, Dan Carpenter, Dr. David Alan Gilbert, H. Peter Anvin, Ingo Molnar, Josh Poimboeuf, Kevin Brodsky, Mike Rapoport, Lukas Bulwahn, Maciej Wieczor-Retman, Max Grobecker, Patryk Wlazlyn, Pawan Gupta, Peter Zijlstra, Philip Redkin, Qasim Ijaz, Rik van Riel, Thomas Gleixner, Thorsten Blum, Tom Lendacky, Tony Luck, Uros Bizjak, Vitaly Kuznetsov, Xin Li, liuye" * tag 'x86-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (211 commits) zstd: Increase DYNAMIC_BMI2 GCC version cutoff from 4.8 to 11.0 to work around compiler segfault x86/asm: Make asm export of __ref_stack_chk_guard unconditional x86/mm: Only do broadcast flush from reclaim if pages were unmapped perf/x86/intel, x86/cpu: Replace Pentium 4 model checks with VFM ones perf/x86/intel, x86/cpu: Simplify Intel PMU initialization x86/headers: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-UAPI headers x86/headers: Replace __ASSEMBLY__ with __ASSEMBLER__ in UAPI headers x86/locking/atomic: Improve performance by using asm_inline() for atomic locking instructions x86/asm: Use asm_inline() instead of asm() in clwb() x86/asm: Use CLFLUSHOPT and CLWB mnemonics in <asm/special_insns.h> x86/hweight: Use asm_inline() instead of asm() x86/hweight: Use ASM_CALL_CONSTRAINT in inline asm() x86/hweight: Use named operands in inline asm() x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG_SMP x86/head/64: Avoid Clang < 17 stack protector in startup code x86/kexec: Merge x86_32 and x86_64 code using macros from <asm/asm.h> x86/runtime-const: Add the RUNTIME_CONST_PTR assembly macro x86/cpu/intel: Limit the non-architectural constant_tsc model checks x86/mm/pat: Replace Intel x86_model checks with VFM ones x86/cpu/intel: Fix fast string initialization for extended Families ...
2025-03-24Merge tag 'perf-core-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull performance events updates from Ingo Molnar: "Core: - Move perf_event sysctls into kernel/events/ (Joel Granados) - Use POLLHUP for pinned events in error (Namhyung Kim) - Avoid the read if the count is already updated (Peter Zijlstra) - Allow the EPOLLRDNORM flag for poll (Tao Chen) - locking/percpu-rwsem: Add guard support [ NOTE: this got (mis-)merged into the perf tree due to related work ] (Peter Zijlstra) perf_pmu_unregister() related improvements: (Peter Zijlstra) - Simplify the perf_event_alloc() error path - Simplify the perf_pmu_register() error path - Simplify perf_pmu_register() - Simplify perf_init_event() - Simplify perf_event_alloc() - Merge struct pmu::pmu_disable_count into struct perf_cpu_pmu_context::pmu_disable_count - Add this_cpc() helper - Introduce perf_free_addr_filters() - Robustify perf_event_free_bpf_prog() - Simplify the perf_mmap() control flow - Further simplify perf_mmap() - Remove retry loop from perf_mmap() - Lift event->mmap_mutex in perf_mmap() - Detach 'struct perf_cpu_pmu_context' and 'struct pmu' lifetimes - Fix perf_mmap() failure path Uprobes: - Harden x86 uretprobe syscall trampoline check (Jiri Olsa) - Remove redundant spinlock in uprobe_deny_signal() (Liao Chang) - Remove the spinlock within handle_singlestep() (Liao Chang) x86 Intel PMU enhancements: - Support PEBS counters snapshotting (Kan Liang) - Fix intel_pmu_read_event() (Kan Liang) - Extend per event callchain limit to branch stack (Kan Liang) - Fix system-wide LBR profiling (Kan Liang) - Allocate bts_ctx only if necessary (Li RongQing) - Apply static call for drain_pebs (Peter Zijlstra) x86 AMD PMU enhancements: (Ravi Bangoria) - Remove pointless sample period check - Fix ->config to sample period calculation for OP PMU - Fix perf_ibs_op.cnt_mask for CurCnt - Don't allow freq mode event creation through ->config interface - Add PMU specific minimum period - Add ->check_period() callback - Ceil sample_period to min_period - Add support for OP Load Latency Filtering - Update DTLB/PageSize decode logic Hardware breakpoints: - Return EOPNOTSUPP for unsupported breakpoint type (Saket Kumar Bhaskar) Hardlockup detector improvements: (Li Huafei) - perf_event memory leak - Warn if watchdog_ev is leaked Fixes and cleanups: - Misc fixes and cleanups (Andy Shevchenko, Kan Liang, Peter Zijlstra, Ravi Bangoria, Thorsten Blum, XieLudan)" * tag 'perf-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (55 commits) perf: Fix __percpu annotation perf: Clean up pmu specific data perf/x86: Remove swap_task_ctx() perf/x86/lbr: Fix shorter LBRs call stacks for the system-wide mode perf: Supply task information to sched_task() perf: attach/detach PMU specific data locking/percpu-rwsem: Add guard support perf: Save PMU specific data in task_struct perf: Extend per event callchain limit to branch stack perf/ring_buffer: Allow the EPOLLRDNORM flag for poll perf/core: Use POLLHUP for pinned events in error perf/core: Use sysfs_emit() instead of scnprintf() perf/core: Remove optional 'size' arguments from strscpy() calls perf/x86/intel/bts: Check if bts_ctx is allocated when calling BTS functions uprobes/x86: Harden uretprobe syscall trampoline check watchdog/hardlockup/perf: Warn if watchdog_ev is leaked watchdog/hardlockup/perf: Fix perf_event memory leak perf/x86: Annotate struct bts_buffer::buf with __counted_by() perf/core: Clean up perf_try_init_event() perf/core: Fix perf_mmap() failure path ...
2025-03-24Merge tag 'sched-core-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler updates from Ingo Molnar: "Core & fair scheduler changes: - Cancel the slice protection of the idle entity (Zihan Zhou) - Reduce the default slice to avoid tasks getting an extra tick (Zihan Zhou) - Force propagating min_slice of cfs_rq when {en,de}queue tasks (Tianchen Ding) - Refactor can_migrate_task() to elimate looping (I Hsin Cheng) - Add unlikey branch hints to several system calls (Colin Ian King) - Optimize current_clr_polling() on certain architectures (Yujun Dong) Deadline scheduler: (Juri Lelli) - Remove redundant dl_clear_root_domain call - Move dl_rebuild_rd_accounting to cpuset.h Uclamp: - Use the uclamp_is_used() helper instead of open-coding it (Xuewen Yan) - Optimize sched_uclamp_used static key enabling (Xuewen Yan) Scheduler topology support: (Juri Lelli) - Ignore special tasks when rebuilding domains - Add wrappers for sched_domains_mutex - Generalize unique visiting of root domains - Rebuild root domain accounting after every update - Remove partition_and_rebuild_sched_domains - Stop exposing partition_sched_domains_locked RSEQ: (Michael Jeanson) - Update kernel fields in lockstep with CONFIG_DEBUG_RSEQ=y - Fix segfault on registration when rseq_cs is non-zero - selftests: Add rseq syscall errors test - selftests: Ensure the rseq ABI TLS is actually 1024 bytes Membarriers: - Fix redundant load of membarrier_state (Nysal Jan K.A.) Scheduler debugging: - Introduce and use preempt_model_str() (Sebastian Andrzej Siewior) - Make CONFIG_SCHED_DEBUG unconditional (Ingo Molnar) Fixes and cleanups: - Always save/restore x86 TSC sched_clock() on suspend/resume (Guilherme G. Piccoli) - Misc fixes and cleanups (Thorsten Blum, Juri Lelli, Sebastian Andrzej Siewior)" * tag 'sched-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits) cpuidle, sched: Use smp_mb__after_atomic() in current_clr_polling() sched/debug: Remove CONFIG_SCHED_DEBUG sched/debug: Remove CONFIG_SCHED_DEBUG from self-test config files sched/debug, Documentation: Remove (most) CONFIG_SCHED_DEBUG references from documentation sched/debug: Make CONFIG_SCHED_DEBUG functionality unconditional sched/debug: Make 'const_debug' tunables unconditional __read_mostly sched/debug: Change SCHED_WARN_ON() to WARN_ON_ONCE() rseq/selftests: Fix namespace collision with rseq UAPI header include/{topology,cpuset}: Move dl_rebuild_rd_accounting to cpuset.h sched/topology: Stop exposing partition_sched_domains_locked cgroup/cpuset: Remove partition_and_rebuild_sched_domains sched/topology: Remove redundant dl_clear_root_domain call sched/deadline: Rebuild root domain accounting after every update sched/deadline: Generalize unique visiting of root domains sched/topology: Wrappers for sched_domains_mutex sched/deadline: Ignore special tasks when rebuilding domains tracing: Use preempt_model_str() xtensa: Rely on generic printing of preemption model x86: Rely on generic printing of preemption model s390: Rely on generic printing of preemption model ...
2025-03-24Merge tag 'objtool-core-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull objtool updates from Ingo Molnar: - The biggest change is the new option to automatically fail the build on objtool warnings: CONFIG_OBJTOOL_WERROR. While there are no currently known unfixed false positives left, such an expansion in the severity of objtool warnings inevitably creates a risk of build failures, so it's disabled by default and depends on !COMPILE_TEST, so it shouldn't be enabled on allyesconfig/allmodconfig builds and won't be forced on people who just accept build-time defaults in 'make oldconfig'. While the option is strongly recommended, only people who enable it explicitly should see it. (Josh Poimboeuf) - Disable branch profiling in noinstr code with a broad brush that includes all of arch/x86/ and kernel/sched/. (Josh Poimboeuf) - Create backup object files on objtool errors and print exact objtool arguments to make failure analysis easier (Josh Poimboeuf) - Improve noreturn handling (Josh Poimboeuf) - Improve rodata handling (Tiezhu Yang) - Support jump tables, switch tables and goto tables on LoongArch (Tiezhu Yang) - Misc cleanups and fixes (Josh Poimboeuf, David Engraf, Ingo Molnar) * tag 'objtool-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits) tracing: Disable branch profiling in noinstr code objtool: Use O_CREAT with explicit mode mask objtool: Add CONFIG_OBJTOOL_WERROR objtool: Create backup on error and print args objtool: Change "warning:" to "error:" for --Werror objtool: Add --Werror option objtool: Add --output option objtool: Upgrade "Linked object detected" warning to error objtool: Consolidate option validation objtool: Remove --unret dependency on --rethunk objtool: Increase per-function WARN_FUNC() rate limit objtool: Update documentation objtool: Improve __noreturn annotation warning objtool: Fix error handling inconsistencies in check() x86/traps: Make exc_double_fault() consistently noreturn LoongArch: Enable jump table for objtool objtool/LoongArch: Add support for goto table objtool/LoongArch: Add support for switch table objtool: Handle PC relative relocation type objtool: Handle different entry size of rodata ...
2025-03-24Merge tag 'locking-core-2025-03-22' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking updates from Ingo Molnar: "Locking primitives: - Micro-optimize percpu_{,try_}cmpxchg{64,128}_op() and {,try_}cmpxchg{64,128} on x86 (Uros Bizjak) - mutexes: extend debug checks in mutex_lock() (Yunhui Cui) - Misc cleanups (Uros Bizjak) Lockdep: - Fix might_fault() lockdep check of current->mm->mmap_lock (Peter Zijlstra) - Don't disable interrupts on RT in disable_irq_nosync_lockdep.*() (Sebastian Andrzej Siewior) - Disable KASAN instrumentation of lockdep.c (Waiman Long) - Add kasan_check_byte() check in lock_acquire() (Waiman Long) - Misc cleanups (Sebastian Andrzej Siewior) Rust runtime integration: - Use Pin for all LockClassKey usages (Mitchell Levy) - sync: Add accessor for the lock behind a given guard (Alice Ryhl) - sync: condvar: Add wait_interruptible_freezable() (Alice Ryhl) - sync: lock: Add an example for Guard:: Lock_ref() (Boqun Feng) Split-lock detection feature (x86): - Fix warning mode with disabled mitigation mode (Maksim Davydov) Locking events: - Add locking events for rtmutex slow paths (Waiman Long) - Add locking events for lockdep (Waiman Long)" * tag 'locking-core-2025-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: lockdep: Remove disable_irq_lockdep() lockdep: Don't disable interrupts on RT in disable_irq_nosync_lockdep.*() rust: lockdep: Use Pin for all LockClassKey usages rust: sync: condvar: Add wait_interruptible_freezable() rust: sync: lock: Add an example for Guard:: Lock_ref() rust: sync: Add accessor for the lock behind a given guard locking/lockdep: Add kasan_check_byte() check in lock_acquire() locking/lockdep: Disable KASAN instrumentation of lockdep.c locking/lock_events: Add locking events for lockdep locking/lock_events: Add locking events for rtmutex slow paths x86/split_lock: Fix the delayed detection logic lockdep/mm: Fix might_fault() lockdep check of current->mm->mmap_lock x86/locking: Remove semicolon from "lock" prefix locking/mutex: Add MUTEX_WARN_ON() into fast path x86/locking: Use asm_inline for {,try_}cmpxchg{64,128} emulations x86/locking: Use ALT_OUTPUT_SP() for percpu_{,try_}cmpxchg{64,128}_op()
2025-03-24Merge tag 'rcu-next-v6.15' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux Pull RCU updates from Boqun Feng: "Documentation: - Add broken-timing possibility to stallwarn.rst - Improve discussion of this_cpu_ptr(), add raw_cpu_ptr() - Document self-propagating callbacks - Point call_srcu() to call_rcu() for detailed memory ordering - Add CONFIG_RCU_LAZY delays to call_rcu() kernel-doc header - Clarify RCU_LAZY and RCU_LAZY_DEFAULT_OFF help text - Remove references to old grace-period-wait primitives srcu: - Introduce srcu_read_{un,}lock_fast(), which is similar to srcu_read_{un,}lock_lite(): avoid smp_mb()s in lock and unlock at the cost of calling synchronize_rcu() in synchronize_srcu() Moreover, by returning the percpu offset of the counter at srcu_read_lock_fast() time, srcu_read_unlock_fast() can avoid extra pointer dereferencing, which makes it faster than srcu_read_{un,}lock_lite() srcu_read_{un,}lock_fast() are intended to replace rcu_read_{un,}lock_trace() if possible RCU torture: - Add get_torture_init_jiffies() to return the start time of the test - Add a test_boost_holdoff module parameter to allow delaying boosting tests when building rcutorture as built-in - Add grace period sequence number logging at the beginning and end of failure/close-call results - Switch to hexadecimal for the expedited grace period sequence number in the rcu_exp_grace_period trace point - Make cur_ops->format_gp_seqs take buffer length - Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool - Complain when invalid SRCU reader_flavor is specified - Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing, which forces SRCU uses atomics even when percpu ops are NMI safe, and use the Kconfig for SRCU lockdep testing Misc: - Split rcu_report_exp_cpu_mult() mask parameter and use for tracing - Remove READ_ONCE() for rdp->gpwrap access in __note_gp_changes() - Fix get_state_synchronize_rcu_full() GP-start detection - Move RCU Tasks self-tests to core_initcall() - Print segment lengths in show_rcu_nocb_gp_state() - Make RCU watch ct_kernel_exit_state() warning - Flush console log from kernel_power_off() - rcutorture: Allow a negative value for nfakewriters - rcu: Update TREE05.boot to test normal synchronize_rcu() - rcu: Use _full() API to debug synchronize_rcu() Make RCU handle PREEMPT_LAZY better: - Fix header guard for rcu_all_qs() - rcu: Rename PREEMPT_AUTO to PREEMPT_LAZY - Update __cond_resched comment about RCU quiescent states - Handle unstable rdp in rcu_read_unlock_strict() - Handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y - osnoise: Provide quiescent states - Adjust rcutorture with possible PREEMPT_RCU=n && PREEMPT_COUNT=y combination - Limit PREEMPT_RCU configurations - Make rcutorture senario TREE07 and senario TREE10 use PREEMPT_LAZY=y" * tag 'rcu-next-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (59 commits) rcutorture: Make scenario TREE07 build CONFIG_PREEMPT_LAZY=y rcutorture: Make scenario TREE10 build CONFIG_PREEMPT_LAZY=y rcu: limit PREEMPT_RCU configurations rcutorture: Update ->extendables check for lazy preemption rcutorture: Update rcutorture_one_extend_check() for lazy preemption osnoise: provide quiescent states rcu: Use _full() API to debug synchronize_rcu() rcu: Update TREE05.boot to test normal synchronize_rcu() rcutorture: Allow a negative value for nfakewriters Flush console log from kernel_power_off() context_tracking: Make RCU watch ct_kernel_exit_state() warning rcu/nocb: Print segment lengths in show_rcu_nocb_gp_state() rcu-tasks: Move RCU Tasks self-tests to core_initcall() rcu: Fix get_state_synchronize_rcu_full() GP-start detection torture: Make SRCU lockdep testing use srcu_read_lock_nmisafe() srcu: Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing rcutorture: Complain when invalid SRCU reader_flavor is specified rcutorture: Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool rcutorture: Make cur_ops->format_gp_seqs take buffer length rcutorture: Add ftrace-compatible timestamp to GP# failure/close-call output ...
2025-03-24Merge tag 'bitmap-for-6.15' of https://github.com/norov/linuxLinus Torvalds
Pull bitmap updates from Yury Norov: - cpumask_next_wrap() rework (me) - GENMASK() simplification (I Hsin) - rust bindings for cpumasks (Viresh and me) - scattered cleanups (Andy, Tamir, Vincent, Ignacio and Joel) * tag 'bitmap-for-6.15' of https://github.com/norov/linux: (22 commits) cpumask: align text in comment riscv: fix test_and_{set,clear}_bit ordering documentation treewide: fix typo 'unsigned __init128' -> 'unsigned __int128' MAINTAINERS: add rust bindings entry for bitmap API rust: Add cpumask helpers uapi: Revert "bitops: avoid integer overflow in GENMASK(_ULL)" cpumask: drop cpumask_next_wrap_old() PCI: hv: Switch hv_compose_multi_msi_req_get_cpu() to using cpumask_next_wrap() scsi: lpfc: rework lpfc_next_{online,present}_cpu() scsi: lpfc: switch lpfc_irq_rebalance() to using cpumask_next_wrap() s390: switch stop_machine_yield() to using cpumask_next_wrap() padata: switch padata_find_next() to using cpumask_next_wrap() cpumask: use cpumask_next_wrap() where appropriate cpumask: re-introduce cpumask_next{,_and}_wrap() cpumask: deprecate cpumask_next_wrap() powerpc/xmon: simplify xmon_batch_next_cpu() ibmvnic: simplify ibmvnic_set_queue_affinity() virtio_net: simplify virtnet_set_affinity() objpool: rework objpool_pop() cpumask: add for_each_{possible,online}_cpu_wrap ...
2025-03-24Merge tag 'docs-6.15' of git://git.lwn.net/linuxLinus Torvalds
Pull documentation updates from Jonathan Corbet: "It has been a reasonably busy cycle for docs... - Significant changes throughout the tree to bring Python code up to current standards and raise the minimum Python required to 3.9 Much of this is preparatory to replacing the ancient Perl scripts/kernel-doc horror with a slightly less horrifying Python implementation, expected for 6.16 - Update the minimum Sphinx required to 3.4.3, allowing us to remove a bunch of older compatibility code - Rework and improve the generation of the ABI documentation (All of the above done by Mauro) - Lots of translation updates. Alex Shi and Yanteng Si are taking on responsibility for the Chinese translations going forward; that work will still get to you via docs-next - Try to standardize the format for indicating a developer's affiliation in commit tags - Clarify the TAB's role in CoC enforcement actions - Try to spell out the rules for when a commit tag can name another developer without their explicit permission Plus lots of other typo fixes and updates" * tag 'docs-6.15' of git://git.lwn.net/linux: (98 commits) docs/zh_CN: fix spelling mistake docs/Chinese: change the disclaimer words docs/zh_CN: Add snp-tdx-threat-model index Chinese translation docs: driver-api: firmware: clarify userspace requirements docs: clarify rules wrt tagging other people docs: Remove outdated highuid.rst documentation Documentation: dma-buf: heaps: Add heap name definitions docs/.../submit-checklist: Use Documentation/admin-guide/abi.rst for cross-ref of README docs: Correct installation instruction Documentation: kcsan: fix "Plain Accesses and Data Races" URL in kcsan.rst Documentation/CoC: Spell out the TAB role in enforcement decisions Documentation: ocxl.rst: Update consortium site scripts: get_feat.pl: substitute s390x with s390 scripts/kernel-doc: drop dead code for Wcontents_before_sections scripts/kernel-doc: don't add not needed new lines docs: driver-api/infiniband.rst: fix Kerneldoc markup drivers: firewire: firewire-cdev.h: fix identation on a kernel-doc markup drivers: media: intel-ipu3.h: fix identation on a kernel-doc markup include/asm-generic/io.h: fix kerneldoc markup Docs/arch/arm64: Fix spelling in amu.rst ...
2025-03-24Merge tag 'stop-machine.2025.03.21a' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu Pull stop-machine update from Paul McKenney: - Add a comment for the call to rcu_momentary_eqs() from multi_cpu_stop() explaining that its purpose is to suppress false-positive RCU CPU stall warnings * tag 'stop-machine.2025.03.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: stop-machine: Add comment for rcu_momentary_eqs()
2025-03-24Merge tag 'lkmm.2025.03.21a' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu Pull kernel memory model updates from Paul McKenney: "Add more atomic operations, rework tags, and update documentation: - Add additional atomic operations (Puranjay Mohan) - Make better use of herd7 tags (Jonas Oberhauser) - Update documentation (Akira Yokosawa) These changes require v7.58 of the herd7 and klitmus tools, up from v7.52" * tag 'lkmm.2025.03.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: tools/memory-model: glossary.txt: Fix indents tools/memory-model/README: Fix typo tools/memory-model: Distinguish between syntactic and semantic tags tools/memory-model: Switch to softcoded herd7 tags tools/memory-model: Define effect of Mb tags on RMWs in tools/... tools/memory-model: Define applicable tags on operation in tools/... tools/memory-model: Legitimize current use of tags in LKMM macros tools/memory-model: Add atomic_andnot() with its variants tools/memory-model: Add atomic_and()/or()/xor() and add_negative
2025-03-24Merge tag 'nolibc-20250308-for-6.15-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu Pull nolibc updates from Paul McKenney: - 32bit s390 support - opendir() and friends - openat() support - sscanf() support - various cleanups [ Paul has just forwarded the pull request from Thomas Weißschuh, so the tag signature is from Thomas, not Paul - Linus ] * tag 'nolibc-20250308-for-6.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (26 commits) tools/nolibc: don't use asm/ UAPI headers selftests/nolibc: stop testing constructor order selftests/nolibc: use O_RDONLY flag instead of 0 tools/nolibc: drop outdated example from overview comment tools/nolibc: process open() vararg as mode_t tools/nolibc: always use openat(2) instead of open(2) tools/nolibc: add support for openat(2) selftests/nolibc: add armthumb configuration selftests/nolibc: explicitly enable ARM mode Revert "selftests: kselftest: Fix build failure with NOLIBC" tools/nolibc: add support for [v]sscanf() tools/nolibc: add support for 32-bit s390 selftests/nolibc: rename s390 to s390x selftests/nolibc: only run constructor tests on nolibc selftests/nolibc: split up architecture list in run-tests.sh tools/nolibc: add support for directory access tools/nolibc: add support for sys_llseek() selftests/nolibc: always keep test kernel configuration up to date selftests/nolibc: execute defconfig before other targets selftests/nolibc: drop call to mrproper target ...
2025-03-24Merge tag 'sched_ext-for-6.15' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext Pull sched_ext updates from Tejun Heo: - Add mechanism to count and report internal events. This significantly improves visibility on subtle corner conditions. - The default idle CPU selection logic is revamped and improved in multiple ways including being made topology aware. - sched_ext was disabling ttwu_queue for simplicity, which can be costly when hardware topology is more complex. Implement SCX_OPS_ALLOWED_QUEUED_WAKEUP so that BPF schedulers can selectively enable ttwu_queue. - tools/sched_ext updates to improve compatibility among others. - Other misc updates and fixes. - sched_ext/for-6.14-fixes were pulled a few times to receive prerequisite fixes and resolve conflicts. * tag 'sched_ext-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: (42 commits) sched_ext: idle: Refactor scx_select_cpu_dfl() sched_ext: idle: Honor idle flags in the built-in idle selection policy sched_ext: Skip per-CPU tasks in scx_bpf_reenqueue_local() sched_ext: Add trace point to track sched_ext core events sched_ext: Change the event type from u64 to s64 sched_ext: Documentation: add task lifecycle summary tools/sched_ext: Provide a compatible helper for scx_bpf_events() selftests/sched_ext: Add NUMA-aware scheduler test tools/sched_ext: Provide consistent access to scx flags sched_ext: idle: Fix scx_bpf_pick_any_cpu_node() behavior sched_ext: idle: Introduce scx_bpf_nr_node_ids() sched_ext: idle: Introduce node-aware idle cpu kfunc helpers sched_ext: idle: Per-node idle cpumasks sched_ext: idle: Introduce SCX_OPS_BUILTIN_IDLE_PER_NODE sched_ext: idle: Make idle static keys private sched/topology: Introduce for_each_node_numadist() iterator mm/numa: Introduce nearest_node_nodemask() nodemask: numa: reorganize inclusion path nodemask: add nodes_copy() tools/sched_ext: Sync with scx repo ...
2025-03-24Merge tag 'cgroup-for-6.15' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup Pull cgroup updates from Tejun Heo: - Add deprecation info messages to cgroup1-only features - rstat updates including a bug fix and breaking up a critical section to reduce interrupt latency impact - Other misc and doc updates * tag 'cgroup-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: rstat: Cleanup flushing functions and locking cgroup/rstat: avoid disabling irqs for O(num_cpu) mm: Fix a build breakage in memcontrol-v1.c blk-cgroup: Simplify policy files registration cgroup: Update file naming comment cgroup: Add deprecation message to legacy freezer controller mm: Add transformation message for per-memcg swappiness RFC cgroup/cpuset-v1: Add deprecation messages to sched_relax_domain_level cgroup/cpuset-v1: Add deprecation messages to memory_migrate cgroup/cpuset-v1: Add deprecation messages to mem_exclusive and mem_hardwall cgroup: Print message when /proc/cgroups is read on v2-only system cgroup/blkio: Add deprecation messages to reset_stats cgroup/cpuset-v1: Add deprecation messages to memory_spread_page and memory_spread_slab cgroup/cpuset-v1: Add deprecation messages to sched_load_balance and memory_pressure_enabled cgroup, docs: Be explicit about independence of RT_GROUP_SCHED and non-cpu controllers cgroup/rstat: Fix forceidle time in cpu.stat cgroup/misc: Remove unused misc_cg_res_total_usage cgroup/cpuset: Move procfs cpuset attribute under cgroup-v1.c cgroup: update comment about dropping cgroup kn refs
2025-03-24Merge tag 'wq-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wqLinus Torvalds
Pull workqueue update from Tejun Heo: "Just one commit to expose system BH workqueues to rust" * tag 'wq-for-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: rust: workqueue: define built-in bh queues
generated by cgit (git 2.34.1) at 2025-09-07 05:00:36 +0000