Commit-ID: f9881cc43b118efc6f82fef2d121166113ee9f8e
Gitweb: https://git.kernel.org/tip/f9881cc43b118efc6f82fef2d121166113ee9f8e
Author: Mark Rutland <mark.rutland@xxxxxxx>
AuthorDate: Mon, 16 Jul 2018 12:30:09 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 25 Jul 2018 11:53:59 +0200
locking/atomics: Instrument xchg()
While we instrument all of the (non-relaxed) atomic_*() functions and
cmpxchg(), we missed xchg().
Let's add instrumentation for xchg(), fixing up x86 to implement
arch_xchg().
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: andy.shevchenko@xxxxxxxxx
Cc: arnd@xxxxxxxx
Cc: aryabinin@xxxxxxxxxxxxx
Cc: catalin.marinas@xxxxxxx
Cc: glider@xxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: parri.andrea@xxxxxxxxx
Cc: peter@xxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20180716113017.3909-5-mark.rutland@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/atomic.h | 2 +-
arch/x86/include/asm/atomic64_64.h | 2 +-
arch/x86/include/asm/cmpxchg.h | 2 +-
include/asm-generic/atomic-instrumented.h | 7 +++++++
4 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index 823fd2f320cf..b143717b92b3 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -202,7 +202,7 @@ static __always_inline bool arch_atomic_try_cmpxchg(atomic_t *v, int *old, int n
static inline int arch_atomic_xchg(atomic_t *v, int new)
{
- return xchg(&v->counter, new);
+ return arch_xchg(&v->counter, new);
}
static inline void arch_atomic_and(int i, atomic_t *v)
diff --git a/arch/x86/include/asm/atomic64_64.h b/arch/x86/include/asm/atomic64_64.h
index 849f1c566a11..4343d9b4f30e 100644
--- a/arch/x86/include/asm/atomic64_64.h
+++ b/arch/x86/include/asm/atomic64_64.h
@@ -188,7 +188,7 @@ static __always_inline bool arch_atomic64_try_cmpxchg(atomic64_t *v, s64 *old, l
static inline long arch_atomic64_xchg(atomic64_t *v, long new)
{
- return xchg(&v->counter, new);
+ return arch_xchg(&v->counter, new);
}
static inline void arch_atomic64_and(long i, atomic64_t *v)
diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h
index e3efd8a06066..a55d79b233d3 100644
--- a/arch/x86/include/asm/cmpxchg.h
+++ b/arch/x86/include/asm/cmpxchg.h
@@ -75,7 +75,7 @@ extern void __add_wrong_size(void)
* use "asm volatile" and "memory" clobbers to prevent gcc from moving
* information around.
*/
-#define xchg(ptr, v) __xchg_op((ptr), (v), xchg, "")
+#define arch_xchg(ptr, v) __xchg_op((ptr), (v), xchg, "")
/*
* Atomic compare and exchange. Compare OLD with MEM, if identical,
diff --git a/include/asm-generic/atomic-instrumented.h b/include/asm-generic/atomic-instrumented.h
index c7c3e4cdd942..53481b6eacdf 100644
--- a/include/asm-generic/atomic-instrumented.h
+++ b/include/asm-generic/atomic-instrumented.h
@@ -408,6 +408,13 @@ static __always_inline bool atomic64_add_negative(s64 i, atomic64_t *v)
}
#endif
+#define xchg(ptr, new) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ kasan_check_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_xchg(__ai_ptr, (new)); \
+})
+
#define cmpxchg(ptr, old, new) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
--
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