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Commit 56813262 authored by H. Peter Anvin's avatar H. Peter Anvin Committed by Greg Kroah-Hartman
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x86: Add memory modify constraints to xchg() and cmpxchg() 

commit 113fc5a6 upstream.

xchg() and cmpxchg() modify their memory operands, not merely read
them.  For some versions of gcc the "memory" clobber has apparently
dealt with the situation, but not for all.
Originally-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Cc: Glauber Costa <glommer@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Peter Palfrader <peter@palfrader.org>
Cc: Greg KH <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Zachary Amsden <zamsden@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
LKML-Reference: <4C4F7277.8050306@zytor.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 203824be
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Showing with 54 additions and 54 deletions
arch/x86/include/asm/cmpxchg_32.h
View file @ 56813262
......@@ -27,20 +27,20 @@ struct __xchg_dummy {
switch (size) { \
case 1: \
asm volatile("xchgb %b0,%1" \
: "=q" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=q" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
case 2: \
asm volatile("xchgw %w0,%1" \
: "=r" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=r" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
case 4: \
asm volatile("xchgl %0,%1" \
: "=r" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=r" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
default: \
......@@ -70,14 +70,14 @@ static inline void __set_64bit(unsigned long long *ptr,
unsigned int low, unsigned int high)
{
asm volatile("\n1:\t"
"movl (%0), %%eax\n\t"
"movl 4(%0), %%edx\n\t"
LOCK_PREFIX "cmpxchg8b (%0)\n\t"
"movl (%1), %%eax\n\t"
"movl 4(%1), %%edx\n\t"
LOCK_PREFIX "cmpxchg8b (%1)\n\t"
"jnz 1b"
: /* no outputs */
: "D"(ptr),
"b"(low),
"c"(high)
: "=m" (*ptr)
: "D" (ptr),
"b" (low),
"c" (high)
: "ax", "dx", "memory");
}
......@@ -121,21 +121,21 @@ extern void __cmpxchg_wrong_size(void);
__typeof__(*(ptr)) __new = (new); \
switch (size) { \
case 1: \
asm volatile(lock "cmpxchgb %b1,%2" \
: "=a"(__ret) \
: "q"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgb %b2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "q" (__new), "0" (__old) \
: "memory"); \
break; \
case 2: \
asm volatile(lock "cmpxchgw %w1,%2" \
: "=a"(__ret) \
: "r"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgw %w2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "r" (__new), "0" (__old) \
: "memory"); \
break; \
case 4: \
asm volatile(lock "cmpxchgl %1,%2" \
: "=a"(__ret) \
: "r"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgl %2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "r" (__new), "0" (__old) \
: "memory"); \
break; \
default: \
......@@ -180,12 +180,12 @@ static inline unsigned long long __cmpxchg64(volatile void *ptr,
unsigned long long new)
{
unsigned long long prev;
asm volatile(LOCK_PREFIX "cmpxchg8b %3"
: "=A"(prev)
: "b"((unsigned long)new),
"c"((unsigned long)(new >> 32)),
"m"(*__xg(ptr)),
"0"(old)
asm volatile(LOCK_PREFIX "cmpxchg8b %1"
: "=A" (prev),
"+m" (*__xg(ptr))
: "b" ((unsigned long)new),
"c" ((unsigned long)(new >> 32)),
"0" (old)
: "memory");
return prev;
}
......@@ -195,12 +195,12 @@ static inline unsigned long long __cmpxchg64_local(volatile void *ptr,
unsigned long long new)
{
unsigned long long prev;
asm volatile("cmpxchg8b %3"
: "=A"(prev)
: "b"((unsigned long)new),
"c"((unsigned long)(new >> 32)),
"m"(*__xg(ptr)),
"0"(old)
asm volatile("cmpxchg8b %1"
: "=A" (prev),
"+m" (*__xg(ptr))
: "b" ((unsigned long)new),
"c" ((unsigned long)(new >> 32)),
"0" (old)
: "memory");
return prev;
}
......
arch/x86/include/asm/cmpxchg_64.h
View file @ 56813262
......@@ -26,26 +26,26 @@ extern void __cmpxchg_wrong_size(void);
switch (size) { \
case 1: \
asm volatile("xchgb %b0,%1" \
: "=q" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=q" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
case 2: \
asm volatile("xchgw %w0,%1" \
: "=r" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=r" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
case 4: \
asm volatile("xchgl %k0,%1" \
: "=r" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=r" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
case 8: \
asm volatile("xchgq %0,%1" \
: "=r" (__x) \
: "m" (*__xg(ptr)), "0" (__x) \
: "=r" (__x), "+m" (*__xg(ptr)) \
: "0" (__x) \
: "memory"); \
break; \
default: \
......@@ -71,27 +71,27 @@ extern void __cmpxchg_wrong_size(void);
__typeof__(*(ptr)) __new = (new); \
switch (size) { \
case 1: \
asm volatile(lock "cmpxchgb %b1,%2" \
: "=a"(__ret) \
: "q"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgb %b2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "q" (__new), "0" (__old) \
: "memory"); \
break; \
case 2: \
asm volatile(lock "cmpxchgw %w1,%2" \
: "=a"(__ret) \
: "r"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgw %w2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "r" (__new), "0" (__old) \
: "memory"); \
break; \
case 4: \
asm volatile(lock "cmpxchgl %k1,%2" \
: "=a"(__ret) \
: "r"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgl %k2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "r" (__new), "0" (__old) \
: "memory"); \
break; \
case 8: \
asm volatile(lock "cmpxchgq %1,%2" \
: "=a"(__ret) \
: "r"(__new), "m"(*__xg(ptr)), "0"(__old) \
asm volatile(lock "cmpxchgq %2,%1" \
: "=a" (__ret), "+m" (*__xg(ptr)) \
: "r" (__new), "0" (__old) \
: "memory"); \
break; \
default: \
......
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