| Age | Commit message (Collapse) | Author |
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In preparation for supporting stage-2 huge mappings for np-guest. Add a
nr_pages argument to the __pkvm_host_wrprotect_guest hypercall. This
range supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is 512
on a 4K-pages system).
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-6-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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In preparation for supporting stage-2 huge mappings for np-guest. Add a
nr_pages argument to the __pkvm_host_unshare_guest hypercall. This range
supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is 512 on a
4K-pages system).
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-5-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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In preparation for supporting stage-2 huge mappings for np-guest. Add a
nr_pages argument to the __pkvm_host_share_guest hypercall. This range
supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is 512 on a
4K-pages system).
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-4-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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Add a helper to iterate over the hypervisor vmemmap. This will be
particularly handy with the introduction of huge mapping support
for the np-guest stage-2.
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-3-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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clean_dcache_guest_page() and invalidate_icache_guest_page() accept a
size as an argument. But they also rely on fixmap, which can only map a
single PAGE_SIZE page.
With the upcoming stage-2 huge mappings for pKVM np-guests, those
callbacks will get size > PAGE_SIZE. Loop the CMOs on a PAGE_SIZE basis
until the whole range is done.
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20250521124834.1070650-2-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
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* kvm-arm64/pkvm-selftest-6.16:
: .
: pKVM selftests covering the memory ownership transitions by
: Quentin Perret. From the initial cover letter:
:
: "We have recently found a bug [1] in the pKVM memory ownership
: transitions by code inspection, but it could have been caught with a
: test.
:
: Introduce a boot-time selftest exercising all the known pKVM memory
: transitions and importantly checks the rejection of illegal transitions.
:
: The new test is hidden behind a new Kconfig option separate from
: CONFIG_EL2_NVHE_DEBUG on purpose as that has side effects on the
: transition checks ([1] doesn't reproduce with EL2 debug enabled).
:
: [1] https://lore.kernel.org/kvmarm/20241128154406.602875-1-qperret@google.com/"
: .
KVM: arm64: Extend pKVM selftest for np-guests
KVM: arm64: Selftest for pKVM transitions
KVM: arm64: Don't WARN from __pkvm_host_share_guest()
KVM: arm64: Add .hyp.data section
Signed-off-by: Marc Zyngier <maz@kernel.org>
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* kvm-arm64/pkvm-6.16:
: .
: pKVM memory management cleanups, courtesy of Quentin Perret.
: From the cover letter:
:
: "This series moves the hypervisor's ownership state to the hyp_vmemmap,
: as discussed in [1]. The two main benefits are:
:
: 1. much cheaper hyp state lookups, since we can avoid the hyp stage-1
: page-table walk;
:
: 2. de-correlates the hyp state from the presence of a mapping in the
: linear map range of the hypervisor; which enables a bunch of
: clean-ups in the existing code and will simplify the introduction of
: other features in the future (hyp tracing, ...)"
: .
KVM: arm64: Unconditionally cross check hyp state
KVM: arm64: Defer EL2 stage-1 mapping on share
KVM: arm64: Move hyp state to hyp_vmemmap
KVM: arm64: Introduce {get,set}_host_state() helpers
KVM: arm64: Use 0b11 for encoding PKVM_NOPAGE
KVM: arm64: Fix pKVM page-tracking comments
KVM: arm64: Track SVE state in the hypervisor vcpu structure
Signed-off-by: Marc Zyngier <maz@kernel.org>
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Usage of longjmp() was added to ensure that teardown is always run in
commit 63e6b2a42342 ("selftests/harness: Run TEARDOWN for ASSERT failures")
However instead of calling longjmp() to the teardown handler it is easier to
just call the teardown handler directly from __bail().
Any potential duplicate teardown invocations are harmless as the actual
handler will only ever be executed once since
commit fff37bd32c76 ("selftests/harness: Fix fixture teardown").
Additionally this removes a incompatibility with nolibc,
which does not support setjmp()/longjmp().
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-12-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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To get rid of setjmp()/longjmp(), the variant and self need to be usable
from __bail().
Make them available from the test metadata.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-11-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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To get rid of setjmp()/longjmp(), the teardown logic needs to be usable
from __bail(). Introduce a new callback for it.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-10-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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To get rid of setjmp()/longjmp(), the teardown logic needs to be usable
from __bail(). To access the atomic teardown conditional from there,
move it into the test metadata.
This also allows the removal of "setup_completed".
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-9-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This field is unused and has no meaning for tests without fixtures.
Don't set it for them.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-8-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Make the kselftest harness compatible with nolibc which does not implement
signals by replacing the signal logic with pidfds.
The code also becomes simpler.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-7-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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__sync_bool_compare_and_swap() is deprecated and requires libatomic on
GCC. Compiler toolchains don't necessarily have libatomic available, so
avoid this requirement by using atomics that don't need libatomic.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-6-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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The pointers to the wrappers are stored in function pointers,
preventing them from actually being inlined.
Remove the inline qualifier, aligning these wrappers with the other
functions defined through macros.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-5-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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With -Wmissing-prototypes the compiler will warn about non-static
functions which don't have a prototype defined.
As they are not used from a different compilation unit they don't need to
be defined globally.
Avoid the issue by marking the functions static.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-4-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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For tests without fixtures the variant argument is unused.
This is intentional, prevent to compiler from complaining.
Example warning:
harness-selftest.c: In function 'wrapper_standalone_pass':
../kselftest_harness.h:181:52: error: unused parameter 'variant' [-Werror=unused-parameter]
181 | struct __fixture_variant_metadata *variant) \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
../kselftest_harness.h:156:25: note: in expansion of macro '__TEST_IMPL'
156 | #define TEST(test_name) __TEST_IMPL(test_name, -1)
| ^~~~~~~~~~~
harness-selftest.c:15:1: note: in expansion of macro 'TEST'
15 | TEST(standalone_pass) {
| ^~~~
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-3-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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All comments in this file use C89 comment style.
Except for this one. Change it to get one step closer to C89
compatibility.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-2-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Add a selftest for the kselftest harness itself so any changes can be
validated.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250505-nolibc-kselftest-harness-v4-1-ee4dd5257135@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Nolibc now provides all the headers required by nolibc-test.c.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-9-74f82eea3b59@weissschuh.net
Acked-by: Willy Tarreau <w@1wt.eu>
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-8-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-7-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-6-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-5-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-4-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-3-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-2-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-1-74f82eea3b59@weissschuh.net
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Newer architectures like riscv 32-bit are missing sys_wait4().
Make use of the fact that wait(&status) is defined to be equivalent to
waitpid(-1, status, 0) to implement it on all architectures.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-15-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Newer architectures (like riscv32) do not implement sys_gettimeofday().
In those cases fall back to sys_clock_gettime().
While that does not support the timezone argument of sys_gettimeofday(),
specifying this argument invokes undefined behaviour, so it's safe to ignore.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-14-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Only the standard POSIX modes are supported.
No extensions nor the (noop) "b" from ISO C are accepted.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-13-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Not all configurations support namespaces, so skip the tests where
necessary. Also if the tests are running without privileges.
Enable the namespace configuration for those architectures where it is not
enabled by default.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-12-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-11-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-10-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-9-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-8-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-7-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-6-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-5-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-4-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Add fstat(), fstatat() and lstat(). All of them use the existing implementation
based on statx().
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-3-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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The %m format can be used to format the current errno.
It is non-standard but supported by other commonly used libcs like glibc and
musl, so applications do rely on them.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-2-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-1-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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The UAPI headers already provide definitions for these symbols.
Using them makes the code shorter, more robust and compatible with
applications using linux/poll.h directly.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250430-poll-v1-2-44b5ceabdeee@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects the definition.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250430-poll-v1-1-44b5ceabdeee@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Add nolibc support for m68k. Should be helpful for nommu where
linking libc can bloat even hello world to the point where you get
an OOM just trying to load it.
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
Link: https://lore.kernel.org/r/20250426224738.284874-1-daniel@0x0f.com
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Prevent regressions of issues validates by the header check by always
running it together with the nolibc selftests.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-3-011576b6ed6f@linutronix.de
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Inclusion of any nolibc header file should also bring all other headers.
On the other hand it should also be possible to include any nolibc header
files
in any order.
Currently this is implemented by including the catch-all nolibc.h after the
headers own definitions.
This is problematic if one nolibc header depends on another one.
The first header has to include the other one before defining any symbols.
That in turn will include the rest of nolibc while the current header has
not defined anything yet. If any other part of nolibc depends on
definitions from the current header, errors are encountered.
This is already the case today. Effectively nolibc can only be included in
the order of nolibc.h.
Restructure the way "nolibc.h" is included.
Move it to the beginning of the header files and before the include guards.
Now any header will behave exactly like "nolibc.h" while the include
guards prevent any duplicate definitions.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-2-011576b6ed6f@linutronix.de
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Each nolibc header should be valid for inclusion irrespective of any
special ordering requirements.
Add a new make target, based on the old kbuild "make header_check" target
to validate this requirement.
For now the check fails, but the following commits will fix the issues.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-1-011576b6ed6f@linutronix.de
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