Commit 8c91c532 authored Apr 06, 2012 by H. Peter Anvin

x86: Use correct byte-sized register constraint in __add()

Similar to:

 2ca052a3 x86: Use correct byte-sized register constraint in __xchg_op()

... the __add() macro also needs to use a "q" constraint in the
byte-sized case, lest we try to generate an illegal register.

Link: http://lkml.kernel.org/r/4F7A3315.501@goop.org


Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Leigh Scott <leigh123linux@googlemail.com>
Cc: Thomas Reitmayr <treitmayr@devbase.at>
Cc: <stable@vger.kernel.org> v3.3

parent 2ca052a3

arch/x86/include/asm/cmpxchg.h

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -173,7 +173,7 @@ extern void __add_wrong_size(void)
	switch (sizeof(*(ptr))) { \		switch (sizeof(*(ptr))) { \
	case __X86_CASE_B: \		case __X86_CASE_B: \
	asm volatile (lock "addb %b1, %0\n" \		asm volatile (lock "addb %b1, %0\n" \
	: "+m" (*(ptr)) : "ri" (inc) \		: "+m" (*(ptr)) : "qi" (inc) \
	: "memory", "cc"); \		: "memory", "cc"); \
	break; \		break; \
	case __X86_CASE_W: \		case __X86_CASE_W: \