[PATCH 9/9] tools: KVM: selftests: Convert clear/set_bit() to actual atomics

[Sean Christopherson]

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@xxxxxxxxxx>
---
 tools/arch/x86/include/asm/atomic.h       |  5 +++++
 tools/include/asm-generic/atomic-gcc.h    | 11 +++++++++++
 tools/include/asm-generic/bitops/atomic.h | 15 ++++++---------
 3 files changed, 22 insertions(+), 9 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 */
diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-generic/atomic-gcc.h
index 37ef522aaac4..9b3c528bab92 100644
--- a/tools/include/asm-generic/atomic-gcc.h
+++ b/tools/include/asm-generic/atomic-gcc.h
@@ -81,4 +81,15 @@ static inline int test_and_set_bit(long nr, unsigned long *addr)
 	return !!(old & mask);
 }
 
+static inline int test_and_clear_bit(long nr, unsigned long *addr)
+{
+	unsigned long mask = BIT_MASK(nr);
+	long old;
+
+	addr += BIT_WORD(nr);
+
+	old = __sync_fetch_and_and(addr, ~mask);
+	return !!(old & mask);
+}
+
 #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */
diff --git a/tools/include/asm-generic/bitops/atomic.h b/tools/include/asm-generic/bitops/atomic.h
index f64b049d236c..ab37a221b41a 100644
--- a/tools/include/asm-generic/bitops/atomic.h
+++ b/tools/include/asm-generic/bitops/atomic.h
@@ -5,14 +5,11 @@
 #include <asm/types.h>
 #include <asm/bitsperlong.h>
 
-static inline void set_bit(unsigned long nr, unsigned long *addr)
-{
-	addr[nr / __BITS_PER_LONG] |= 1UL << (nr % __BITS_PER_LONG);
-}
-
-static inline void clear_bit(unsigned long nr, unsigned long *addr)
-{
-	addr[nr / __BITS_PER_LONG] &= ~(1UL << (nr % __BITS_PER_LONG));
-}
+/*
+ * Just alias the test versions, all of the compiler built-in atomics "fetch",
+ * and optimizing compile-time constants on x86 isn't worth the complexity.
+ */
+#define set_bit test_and_set_bit
+#define clear_bit test_and_clear_bit
 
 #endif /* _TOOLS_LINUX_ASM_GENERIC_BITOPS_ATOMIC_H_ */
-- 
2.38.1.584.g0f3c55d4c2-goog