diff options
| author | Peter Gonda <pgonda@google.com> | 2022-10-06 02:34:06 +0200 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2022-11-17 01:58:52 +0100 |
| commit | cf4694be2b2cf74945e50d39a02ea2307c4495f4 (patch) | |
| tree | 74389c8ce3d4978a99def91aa5f9a259a61437fb /tools/arch | |
| parent | KVM: selftests: Automatically do init_ucall() for non-barebones VMs (diff) | |
| download | linux-cf4694be2b2cf74945e50d39a02ea2307c4495f4.tar.xz linux-cf4694be2b2cf74945e50d39a02ea2307c4495f4.zip | |
tools: Add atomic_test_and_set_bit()
Add x86 and generic implementations of atomic_test_and_set_bit() to allow
KVM selftests to atomically manage bitmaps.
Note, the generic version is taken from arch_test_and_set_bit() as of
commit 415d83249709 ("locking/atomic: Make test_and_*_bit() ordered on
failure").
Signed-off-by: Peter Gonda <pgonda@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221006003409.649993-5-seanjc@google.com
Diffstat (limited to 'tools/arch')
| -rw-r--r-- | tools/arch/x86/include/asm/atomic.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h index 1f5e26aae9fc..01cc27ec4520 100644 --- a/tools/arch/x86/include/asm/atomic.h +++ b/tools/arch/x86/include/asm/atomic.h @@ -8,6 +8,7 @@ #define LOCK_PREFIX "\n\tlock; " +#include <asm/asm.h> #include <asm/cmpxchg.h> /* @@ -70,4 +71,10 @@ static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new) return cmpxchg(&v->counter, old, new); } +static inline int atomic_test_and_set_bit(long nr, unsigned long *addr) +{ + GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c"); + +} + #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ |