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| author | Sean Christopherson <seanjc@google.com> | 2022-11-19 01:34:50 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-02 13:22:35 -0500 |
| commit | bb056c0f080a3d15c2a9ad9057a8b542d45e4ba0 (patch) | |
| tree | a7231d2f04e11798c35e848bcfbddb4db0bc098b /tools/arch | |
| parent | 36293352ff433061d45d52784983e44950c09ae3 (diff) | |
| download | linux-bb056c0f080a3d15c2a9ad9057a8b542d45e4ba0.tar.bz2 | |
tools: KVM: selftests: Convert clear/set_bit() to actual atomics
Convert {clear,set}_bit() to atomics as KVM's ucall implementation relies
on clear_bit() being atomic, they are defined in atomic.h, and the same
helpers in the kernel proper are atomic.
KVM's ucall infrastructure is the only user of clear_bit() in tools/, and
there are no true set_bit() users. tools/testing/nvdimm/ does make heavy
use of set_bit(), but that code builds into a kernel module of sorts, i.e.
pulls in all of the kernel's header and so is already getting the kernel's
atomic set_bit().
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221119013450.2643007-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/arch')
| -rw-r--r-- | tools/arch/x86/include/asm/atomic.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h index a42733af7d51..365cf182df12 100644 --- a/tools/arch/x86/include/asm/atomic.h +++ b/tools/arch/x86/include/asm/atomic.h @@ -76,4 +76,9 @@ static inline int test_and_set_bit(long nr, unsigned long *addr) GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c"); } +static inline int test_and_clear_bit(long nr, unsigned long *addr) +{ + GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btc), *addr, "Ir", nr, "%0", "c"); +} + #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ |