diff mbox series

[RFC,V1,07/10] tools: Add atomic_test_and_set_bit()

Message ID 20220715192956.1873315-9-pgonda@google.com (mailing list archive)
State New, archived
Headers show
Series *** KVM: selftests: Add simple SEV test | expand

Commit Message

Peter Gonda July 15, 2022, 7:29 p.m. UTC 
atomic_test_and_set_bit() allows for atomic bitmap usage from KVM
selftests.

Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>

---
 tools/arch/x86/include/asm/atomic.h | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h
index 1f5e26aae9fc..45ea15c98957 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, volatile unsigned long *addr)
+{
+	GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c");
+
+}
+
 #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */