From cf4694be2b2cf74945e50d39a02ea2307c4495f4 Mon Sep 17 00:00:00 2001 From: Peter Gonda Date: Thu, 6 Oct 2022 00:34:06 +0000 Subject: 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 Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20221006003409.649993-5-seanjc@google.com --- tools/arch/x86/include/asm/atomic.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'tools/arch') 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 #include /* @@ -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 */ -- cgit