5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Beulich <jbeulich@xxxxxxxx>
commit 1df931d95f4dc1c11db1123e85d4e08156e46ef9 upstream.
As noted (and fixed) a couple of times in the past, "=@cc<cond>" outputs
and clobbering of "cc" don't work well together. The compiler appears to
mean to reject such, but doesn't - in its upstream form - quite manage
to yet for "cc". Furthermore two similar macros don't clobber "cc", and
clobbering "cc" is pointless in asm()-s for x86 anyway - the compiler
always assumes status flags to be clobbered there.
Fixes: 989b5db215a2 ("x86/uaccess: Implement macros for CMPXCHG on user addresses")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Message-Id: <485c0c0b-a3a7-0b7c-5264-7d00c01de032@xxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/uaccess.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -471,7 +471,7 @@ do { \
[ptr] "+m" (*_ptr), \
[old] "+a" (__old) \
: [new] ltype (__new) \
- : "memory", "cc"); \
+ : "memory"); \
if (unlikely(__err)) \
goto label; \
if (unlikely(!success)) \
