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2019-09-19Merge tag 'dma-mapping-5.4' of git://git.infradead.org/users/hch/dma-mappingLinus Torvalds
Pull dma-mapping updates from Christoph Hellwig: - add dma-mapping and block layer helpers to take care of IOMMU merging for mmc plus subsequent fixups (Yoshihiro Shimoda) - rework handling of the pgprot bits for remapping (me) - take care of the dma direct infrastructure for swiotlb-xen (me) - improve the dma noncoherent remapping infrastructure (me) - better defaults for ->mmap, ->get_sgtable and ->get_required_mask (me) - cleanup mmaping of coherent DMA allocations (me) - various misc cleanups (Andy Shevchenko, me) * tag 'dma-mapping-5.4' of git://git.infradead.org/users/hch/dma-mapping: (41 commits) mmc: renesas_sdhi_internal_dmac: Add MMC_CAP2_MERGE_CAPABLE mmc: queue: Fix bigger segments usage arm64: use asm-generic/dma-mapping.h swiotlb-xen: merge xen_unmap_single into xen_swiotlb_unmap_page swiotlb-xen: simplify cache maintainance swiotlb-xen: use the same foreign page check everywhere swiotlb-xen: remove xen_swiotlb_dma_mmap and xen_swiotlb_dma_get_sgtable xen: remove the exports for xen_{create,destroy}_contiguous_region xen/arm: remove xen_dma_ops xen/arm: simplify dma_cache_maint xen/arm: use dev_is_dma_coherent xen/arm: consolidate page-coherent.h xen/arm: use dma-noncoherent.h calls for xen-swiotlb cache maintainance arm: remove wrappers for the generic dma remap helpers dma-mapping: introduce a dma_common_find_pages helper dma-mapping: always use VM_DMA_COHERENT for generic DMA remap vmalloc: lift the arm flag for coherent mappings to common code dma-mapping: provide a better default ->get_required_mask dma-mapping: remove the dma_declare_coherent_memory export remoteproc: don't allow modular build ...
2019-09-08parisc: add support for kexec_file_load() syscallSven Schnelle
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-08parisc: add kexec syscall supportSven Schnelle
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-04parisc: don't set ARCH_NO_COHERENT_DMA_MMAPChristoph Hellwig
parisc is the only architecture that sets ARCH_NO_COHERENT_DMA_MMAP when an MMU is enabled. AFAIK this is because parisc CPUs use VIVT caches, which means exporting normally cachable memory to userspace is relatively dangrous due to cache aliasing. But normally cachable memory is only allocated by dma_alloc_coherent on parisc when using the sba_iommu or ccio_iommu drivers, so just remove the .mmap implementation for them so that we don't have to set ARCH_NO_COHERENT_DMA_MMAP, which I plan to get rid of. Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-08-03parisc/ftrace: Add KPROBES_ON_FTRACESven Schnelle
Allow KPROBES to use the ftrace infrastructure on PA-RISC. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-15docs: admin-guide: add a series of orphaned documentsMauro Carvalho Chehab
There are lots of documents that belong to the admin-guide but are on random places (most under Documentation root dir). Move them to the admin guide. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
2019-06-08parisc: add dynamic ftraceSven Schnelle
This patch implements dynamic ftrace for PA-RISC. The required mcount call sequences can get pretty long, so instead of patching the whole call sequence out of the functions, we are using -fpatchable-function-entry from gcc. This puts a configurable amount of NOPS before/at the start of the function. Taking do_sys_open() as example, which would look like this when the call is patched out: 1036b248: 08 00 02 40 nop 1036b24c: 08 00 02 40 nop 1036b250: 08 00 02 40 nop 1036b254: 08 00 02 40 nop 1036b258 <do_sys_open>: 1036b258: 08 00 02 40 nop 1036b25c: 08 03 02 41 copy r3,r1 1036b260: 6b c2 3f d9 stw rp,-14(sp) 1036b264: 08 1e 02 43 copy sp,r3 1036b268: 6f c1 01 00 stw,ma r1,80(sp) When ftrace gets enabled for this function the kernel will patch these NOPs to: 1036b248: 10 19 57 20 <address of ftrace> 1036b24c: 6f c1 00 80 stw,ma r1,40(sp) 1036b250: 48 21 3f d1 ldw -18(r1),r1 1036b254: e8 20 c0 02 bv,n r0(r1) 1036b258 <do_sys_open>: 1036b258: e8 3f 1f df b,l,n .-c,r1 1036b25c: 08 03 02 41 copy r3,r1 1036b260: 6b c2 3f d9 stw rp,-14(sp) 1036b264: 08 1e 02 43 copy sp,r3 1036b268: 6f c1 01 00 stw,ma r1,80(sp) So the first NOP in do_sys_open() will be patched to jump backwards into some minimal trampoline code which pushes a stackframe, saves r1 which holds the return address, loads the address of the real ftrace function, and branches to that location. For 64 Bit things are getting a bit more complicated (and longer) because we must make sure that the address of ftrace location is 8 byte aligned, and the offset passed to ldd for fetching the address is 8 byte aligned as well. Note that gcc has a bug which misplaces the function label, and needs a patch to make dynamic ftrace work. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90751 for details. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-20parisc: Allow building 64-bit kernel without -mlong-calls compiler optionHelge Deller
A 64-bit kernel built without CONFIG_MLONGCALLS (-mlong-calls compiler option) usually fails to link because of unreachable functions. Try to work around that linking issue by moving the *.init and *.exit text segments closer to the main text segment. With that change those segments now don't get freed at runtime any longer, but since we in most cases run with huge-page enabled, we ignore the lost memory in preference of better performance. This change will not guarantee that every kernel config will now sucessfully build with short calls and without linking issues. Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-20parisc: Kconfig: remove ARCH_DISCARD_MEMBLOCKMike Rapoport
Since commit 350e88bad496 ("mm: memblock: make keeping memblock memory opt-in rather than opt-out") the default behaviour is to discard memblock data after init and the ARCH_DISCARD_MEMBLOCK is obsolete. Remove it. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-07Merge branch 'parisc-5.2-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc updates from Helge Deller: "Many great new features, fixes and optimizations, including: - Convert page table updates to use per-pagetable spinlocks which overall improves performance on SMP machines a lot, by Mikulas Patocka - Kernel debugger (KGDB) support, by Sven Schnelle - KPROBES support, by Sven Schnelle - Lots of TLB lock/flush improvements, by Dave Anglin - Drop DISCONTIGMEM and switch to SPARSEMEM - Added JUMP_LABEL, branch runtime-patching support - Lots of other small speedups and cleanups, e.g. for QEMU, stack randomization, avoidance of name clashes, documentation updates, etc ..." * 'parisc-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (28 commits) parisc: Add static branch and JUMP_LABEL feature parisc: Use PA_ASM_LEVEL in boot code parisc: Rename LEVEL to PA_ASM_LEVEL to avoid name clash with DRBD code parisc: Update huge TLB page support to use per-pagetable spinlock parisc: Use per-pagetable spinlock parisc: Allow live-patching of __meminit functions parisc: Add memory barrier to asm pdc and sync instructions parisc: Add memory clobber to TLB purges parisc: Use ldcw instruction for SMP spinlock release barrier parisc: Remove lock code to serialize TLB operations in pacache.S parisc: Switch from DISCONTIGMEM to SPARSEMEM parisc: enable wide mode early parisc: update feature lists parisc: Show n/a if product number not available parisc: remove unused flags parameter in __patch_text() doc: update kprobes supported architecture list parisc: Implement kretprobes parisc: remove kprobes.h from generic-y parisc: Implement kprobes parisc: add functions required by KPROBE_EVENTS ...
2019-05-06parisc: Add static branch and JUMP_LABEL featureHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Switch from DISCONTIGMEM to SPARSEMEMHelge Deller
The commit 1c30844d2dfe ("mm: reclaim small amounts of memory when an external fragmentation event occurs") breaks memory management on a parisc c8000 workstation with this memory layout: 0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB 1) Start 0x0000000100000000 End 0x00000001bfdfffff Size 3070 MB 2) Start 0x0000004040000000 End 0x00000040ffffffff Size 3072 MB With the patch 1c30844d2dfe, the kernel will incorrectly reclaim the first zone when it fills up, ignoring the fact that there are two completely free zones. Basiscally, it limits cache size to 1GiB. The parisc kernel is currently using the DISCONTIGMEM implementation, but isn't NUMA. Avoid this issue or strange work-arounds by switching to the more commonly used SPARSEMEM implementation. Reported-by: Mikulas Patocka <mpatocka@redhat.com> Fixes: 1c30844d2dfe ("mm: reclaim small amounts of memory when an external fragmentation event occurs") Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Implement kretprobesSven Schnelle
Implement kretprobes on parisc, parts stolen from powerpc. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Implement kprobesSven Schnelle
Implement kprobes support for PA-RISC. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: add KGDB supportSven Schnelle
This patch add KGDB support to PA-RISC. It also implements single-stepping utilizing the recovery counter. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-04-03locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archsWaiman Long
Currently, we have two different implementation of rwsem: 1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c) 2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c) As we are going to use a single generic implementation for rwsem-xadd.c and no architecture-specific code will be needed, there is no point in keeping two different implementations of rwsem. In most cases, the performance of rwsem-spinlock.c will be worse. It also doesn't get all the performance tuning and optimizations that had been implemented in rwsem-xadd.c over the years. For simplication, we are going to remove rwsem-spinlock.c and make all architectures use a single implementation of rwsem - rwsem-xadd.c. All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM in the code are removed. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-riscv@lists.infradead.org Cc: linux-um@lists.infradead.org Cc: linux-xtensa@linux-xtensa.org Cc: linuxppc-dev@lists.ozlabs.org Cc: nios2-dev@lists.rocketboards.org Cc: openrisc@lists.librecores.org Cc: uclinux-h8-devel@lists.sourceforge.jp Link: https://lkml.kernel.org/r/20190322143008.21313-3-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-1932-bit userspace ABI: introduce ARCH_32BIT_OFF_T config optionYury Norov
All new 32-bit architectures should have 64-bit userspace off_t type, but existing architectures has 32-bit ones. To enforce the rule, new config option is added to arch/Kconfig that defaults ARCH_32BIT_OFF_T to be disabled for new 32-bit architectures. All existing 32-bit architectures enable it explicitly. New option affects force_o_largefile() behaviour. Namely, if userspace off_t is 64-bits long, we have no reason to reject user to open big files. Note that even if architectures has only 64-bit off_t in the kernel (arc, c6x, h8300, hexagon, nios2, openrisc, and unicore32), a libc may use 32-bit off_t, and therefore want to limit the file size to 4GB unless specified differently in the open flags. Signed-off-by: Yury Norov <ynorov@caviumnetworks.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Yury Norov <ynorov@marvell.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-12-29Merge tag 'kconfig-v4.21-2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kconfig file consolidation from Masahiro Yamada: "Consolidation of bus (PCI, PCMCIA, EISA, RapidIO) config entries by Christoph Hellwig. Currently, every architecture that wants to provide common peripheral busses needs to add some boilerplate code and include the right Kconfig files. This series instead just selects the presence (when needed) and then handles everything in the bus-specific Kconfig file under drivers/" * tag 'kconfig-v4.21-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: pcmcia: remove per-arch PCMCIA config entry eisa: consolidate EISA Kconfig entry in drivers/eisa rapidio: consolidate RAPIDIO config entry in drivers/rapidio pcmcia: allow PCMCIA support independent of the architecture PCI: consolidate the PCI_SYSCALL symbol PCI: consolidate the PCI_DOMAINS and PCI_DOMAINS_GENERIC config options PCI: consolidate PCI config entry in drivers/pci MIPS: remove the HT_PCI config option
2018-12-13dma-mapping: always build the direct mapping codeChristoph Hellwig
All architectures except for sparc64 use the dma-direct code in some form, and even for sparc64 we had the discussion of a direct mapping mode a while ago. In preparation for directly calling the direct mapping code don't bother having it optionally but always build the code in. This is a minor hardship for some powerpc and arm configs that don't pull it in yet (although they should in a relase ot two), and sparc64 which currently doesn't need it at all, but it will reduce the ifdef mess we'd otherwise need significantly. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com>
2018-12-06arch: switch the default on ARCH_HAS_SG_CHAINChristoph Hellwig
These days architectures are mostly out of the business of dealing with struct scatterlist at all, unless they have architecture specific iommu drivers. Replace the ARCH_HAS_SG_CHAIN symbol with a ARCH_NO_SG_CHAIN one only enabled for architectures with horrible legacy iommu drivers like alpha and parisc, and conditionally for arm which wants to keep it disable for legacy platforms. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
2018-11-23PCI: consolidate PCI config entry in drivers/pciChristoph Hellwig
There is no good reason to duplicate the PCI menu in every architecture. Instead provide a selectable HAVE_PCI symbol that indicates availability of PCI support, and a FORCE_PCI symbol to for PCI on and the handle the rest in drivers/pci. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Paul Burton <paul.burton@mips.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-10-31mm: remove CONFIG_HAVE_MEMBLOCKMike Rapoport
All architecures use memblock for early memory management. There is no need for the CONFIG_HAVE_MEMBLOCK configuration option. [rppt@linux.vnet.ibm.com: of/fdt: fixup #ifdefs] Link: http://lkml.kernel.org/r/20180919103457.GA20545@rapoport-lnx [rppt@linux.vnet.ibm.com: csky: fixups after bootmem removal] Link: http://lkml.kernel.org/r/20180926112744.GC4628@rapoport-lnx [rppt@linux.vnet.ibm.com: remove stale #else and the code it protects] Link: http://lkml.kernel.org/r/1538067825-24835-1-git-send-email-rppt@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1536927045-23536-4-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Acked-by: Michal Hocko <mhocko@suse.com> Tested-by: Jonathan Cameron <jonathan.cameron@huawei.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <lftan@altera.com> Cc: Mark Salter <msalter@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Serge Semin <fancer.lancer@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-10-31mm: remove CONFIG_NO_BOOTMEMMike Rapoport
All achitectures select NO_BOOTMEM which essentially becomes 'Y' for any kernel configuration and therefore it can be removed. [alexander.h.duyck@linux.intel.com: remove now defunct NO_BOOTMEM from depends list for deferred init] Link: http://lkml.kernel.org/r/20180925201814.3576.15105.stgit@localhost.localdomain Link: http://lkml.kernel.org/r/1536927045-23536-3-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <lftan@altera.com> Cc: Mark Salter <msalter@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Serge Semin <fancer.lancer@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-09-20dma-mapping: merge direct and noncoherent opsChristoph Hellwig
All the cache maintainance is already stubbed out when not enabled, but merging the two allows us to nicely handle the case where cache maintainance is required for some devices, but not others. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
2018-08-15Merge tag 'kconfig-v4.19-2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kconfig consolidation from Masahiro Yamada: "Consolidation of Kconfig files by Christoph Hellwig. Move the source statements of arch-independent Kconfig files instead of duplicating the includes in every arch/$(SRCARCH)/Kconfig" * tag 'kconfig-v4.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kconfig: add a Memory Management options" menu kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt kconfig: use a menu in arch/Kconfig to reduce clutter kconfig: include kernel/Kconfig.preempt from init/Kconfig Kconfig: consolidate the "Kernel hacking" menu kconfig: include common Kconfig files from top-level Kconfig kconfig: remove duplicate SWAP symbol defintions um: create a proper drivers Kconfig um: cleanup Kconfig files um: stop abusing KBUILD_KCONFIG
2018-08-13parisc: Add HAVE_REGS_AND_STACK_ACCESS_API featureHelge Deller
Some parts of the HAVE_REGS_AND_STACK_ACCESS_API feature is needed for the rseq syscall. This patch adds the most important parts, and as long as we don't support kprobes, we should be fine. Signed-off-by: Helge Deller <deller@gmx.de>
2018-08-13parisc: use generic dma_noncoherent_opsChristoph Hellwig
Switch to the generic noncoherent direct mapping implementation. Fix sync_single_for_cpu to do skip the cache flush unless the transfer is to the device to match the more tested unmap_single path which should have the same cache coherency implications. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Helge Deller <deller@gmx.de>
2018-08-10lib/ubsan: remove null-pointer checksAndrey Ryabinin
With gcc-8 fsanitize=null become very noisy. GCC started to complain about things like &a->b, where 'a' is NULL pointer. There is no NULL dereference, we just calculate address to struct member. It's technically undefined behavior so UBSAN is correct to report it. But as long as there is no real NULL-dereference, I think, we should be fine. -fno-delete-null-pointer-checks compiler flag should protect us from any consequences. So let's just no use -fsanitize=null as it's not useful for us. If there is a real NULL-deref we will see crash. Even if userspace mapped something at NULL (root can do this), with things like SMAP should catch the issue. Link: http://lkml.kernel.org/r/20180802153209.813-1-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-08parisc: Enable CONFIG_MLONGCALLS by defaultHelge Deller
Enable the -mlong-calls compiler option by default, because otherwise in most cases linking the vmlinux binary fails due to truncations of R_PARISC_PCREL22F relocations. This fixes building the 64-bit defconfig. Cc: stable@vger.kernel.org # 4.0+ Signed-off-by: Helge Deller <deller@gmx.de>
2018-08-02kconfig: include kernel/Kconfig.preempt from init/KconfigChristoph Hellwig
Almost all architectures include it. Add a ARCH_NO_PREEMPT symbol to disable preempt support for alpha, hexagon, non-coldfire m68k and user mode Linux. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-08-02Kconfig: consolidate the "Kernel hacking" menuChristoph Hellwig
Move the source of lib/Kconfig.debug and arch/$(ARCH)/Kconfig.debug to the top-level Kconfig. For two architectures that means moving their arch-specific symbols in that menu into a new arch Kconfig.debug file, and for a few more creating a dummy file so that we can include it unconditionally. Also move the actual 'Kernel hacking' menu to lib/Kconfig.debug, where it belongs. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-08-02kconfig: include common Kconfig files from top-level KconfigChristoph Hellwig
Instead of duplicating the source statements in every architecture just do it once in the toplevel Kconfig file. Note that with this the inclusion of arch/$(SRCARCH/Kconfig moves out of the top-level Kconfig into arch/Kconfig so that don't violate ordering constraits while keeping a sensible menu structure. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-06-28parisc: Default to 4 SMP CPUsHelge Deller
I haven't seen any real SMP machine yet with > 4 CPUs (we don't suport SuperDomes yet), so reducing the default maximum number of CPUs may speed up various bitop functions which depend on number of CPUs in the system. bload-o-meter on a typical 64-bit kernel shows: Data: add/remove: 0/0 grow/shrink: 0/10 up/down: 0/-3724 (-3724) Total: Before=1910404, After=1906680, chg -0.19% Code: add/remove: 0/2 grow/shrink: 42/38 up/down: 2320/-3500 (-1180) Total: Before=11053099, After=11051919, chg -0.01% Signed-off-by: Helge Deller <deller@gmx.de>
2018-06-28parisc: Mark 16kB and 64kB page sizes BROKENHelge Deller
A full boot only succeeds with 4kB page sizes currently. For 16kB and 64kB page size support somone needs to fix the LBA PCI code at least, so mark those broken for now. Signed-off-by: Helge Deller <deller@gmx.de>
2018-06-15arch/*: Kconfig: fix documentation for NMI watchdogMauro Carvalho Chehab
Changeset 9919cba7ff71 ("watchdog: Update documentation") updated the documentation, removing the old nmi_watchdog.txt and adding a file with a new content. Update Kconfig files accordingly. Fixes: 9919cba7ff71 ("watchdog: Update documentation") Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Jonathan Corbet <corbet@lwn.net>
2018-05-09dma-mapping: move the NEED_DMA_MAP_STATE config symbol to lib/KconfigChristoph Hellwig
This way we have one central definition of it, and user can select it as needed. Note that we now also always select it when CONFIG_DMA_API_DEBUG is select, which fixes some incorrect checks in a few network drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
2018-05-09scatterlist: move the NEED_SG_DMA_LENGTH config symbol to lib/KconfigChristoph Hellwig
This way we have one central definition of it, and user can select it as needed. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
2018-04-11parisc: Switch to generic COMPAT_BINFMT_ELFHelge Deller
Drop our own compat binfmt implementation in arch/parisc/kernel/binfmt_elf32.c in favour of the generic implementation with CONFIG_COMPAT_BINFMT_ELF. While cleaning up the dependencies, I noticed that ELF_PLATFORM was strangely defined: On a 32-bit kernel, it was defined to "PARISC", while when running in compat mode on a 64-bit kernel it was defined to "PARISC32". Since it doesn't seem to be used in glibc yet, it's now defined in both cases to "PARISC". In any case, it can be distinguished because it's either a 32-bit or a 64-bit ELF file. Signed-off-by: Helge Deller <deller@gmx.de>
2018-03-27parisc/Kconfig: SMP kernels boot on all machinesHelge Deller
I'm not aware of any machines which won't be able to run our SMP kernel. Refine the Kconfig help text. Signed-off-by: Helge Deller <deller@gmx.de>
2017-11-17arch: Fix duplicates in Kconfig for parisc and sparcBabu Moger
Fix duplicates for sparc and parisc. This was due these following commits. 1. commit 4c97a0c8fee3 ("arch: define CPU_BIG_ENDIAN for all fixed big endian archs") 2. commit 97d9f969161d ("arch/sparc: Define config parameter CPU_BIG_ENDIAN") 3. commit 74ad3d28af21 ("parisc: Define CONFIG_CPU_BIG_ENDIAN") Remove duplicates. Signed-off-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: Helge Deller <deller@gmx.de>
2017-11-17parisc: Add CPU topology supportHelge Deller
Add topology support, including multi-core scheduler support on PA8800/PA8900 CPUs and enhanced output in /proc/cpuinfo, e.g. lscpu now reports on a single-socket, dual-core machine: Architecture: parisc64 CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 CPU family: PA-RISC 2.0 Model name: PA8800 (Mako) Signed-off-by: Helge Deller <deller@gmx.de>
2017-11-02License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseGreg Kroah-Hartman
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-09-22parisc: Reintroduce option to gzip-compress the kernelHelge Deller
By adding the feature to build the kernel as self-extracting executeable, the possibility to simply compress the kernel with gzip was lost. This patch now reintroduces this possibilty again and leaves it up to the user to decide how the kernel should be built. The palo bootloader is able to natively load both formats. Signed-off-by: Helge Deller <deller@gmx.de>
2017-09-08arch: define CPU_BIG_ENDIAN for all fixed big endian archsBabu Moger
Patch series "Define CPU_BIG_ENDIAN or warn for inconsistencies", v3. While working on enabling queued rwlock on SPARC, found this following code in include/asm-generic/qrwlock.h which uses CONFIG_CPU_BIG_ENDIAN to clear a byte. static inline u8 *__qrwlock_write_byte(struct qrwlock *lock) { return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN); } Problem is many of the fixed big endian architectures don't define CPU_BIG_ENDIAN and clears the wrong byte. Define CPU_BIG_ENDIAN for all the fixed big endian architecture to fix it. Also found few more references of this config parameter in drivers/of/base.c drivers/of/fdt.c drivers/tty/serial/earlycon.c drivers/tty/serial/serial_core.c Be aware that this may cause regressions if someone has worked-around problems in the above code already. Remove the work-around. Here is our original discussion https://lkml.org/lkml/2017/5/24/620 Link: http://lkml.kernel.org/r/1499358861-179979-2-git-send-email-babu.moger@oracle.com Signed-off-by: Babu Moger <babu.moger@oracle.com> Suggested-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Stafford Horne <shorne@gmail.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Michal Simek <monstr@monstr.eu> Cc: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Greg KH <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-08-22parisc: Wire up support for self-extracting kernelHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2017-08-22parisc: Enable UBSAN supportHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2017-08-22parisc: PDT: Add full support for memory failure via Page Deallocation Table ↵Helge Deller
(PDT) This patch adds full support to read PDT info on all machine types. At bootup the PDT is read and bad memory excluded from usage via memblock_reserve(). Later in the boot process a kernel thread is started (kpdtd) which regularily checks firmare for new reported bad memory and tries to soft offline pages in case of correctable errors and to kill processes and exclude such memory in case of uncorrectable errors via memory_failure(). Signed-off-by: Helge Deller <deller@gmx.de>
2017-07-31parisc: Define CONFIG_CPU_BIG_ENDIANBabu Moger
While working on enabling queued rwlock on SPARC, found this following code in include/asm-generic/qrwlock.h which uses CONFIG_CPU_BIG_ENDIAN to clear a byte. static inline u8 *__qrwlock_write_byte(struct qrwlock *lock) { return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN); } Problem is many of the fixed big endian architectures don't define CPU_BIG_ENDIAN and clears the wrong byte. Define CPU_BIG_ENDIAN for parisc architecture to fix it. Signed-off-by: Babu Moger <babu.moger@oracle.com> Signed-off-by: Helge Deller <deller@gmx.de>
2017-04-26HAVE_ARCH_HARDENED_USERCOPY is unconditional nowAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-04-26CONFIG_ARCH_HAS_RAW_COPY_USER is unconditional nowAl Viro
all architectures converted Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>