Commit e4d16def authored Jul 20, 2020 by Brian Gerst Committed by Thomas Gleixner Jul 23, 2020

x86/percpu: Remove "e" constraint from XADD



The "e" constraint represents a constant, but the XADD instruction doesn't
accept immediate operands.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Dennis Zhou <dennis@kernel.org>
Link: https://lkml.kernel.org/r/20200720204925.3654302-6-ndesaulniers@google.com

parent 33e5614a

arch/x86/include/asm/percpu.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -220,7 +220,7 @@ do { \
		break; \
		case 8: \
		asm qual ("xaddq %0, "__percpu_arg(1) \
		: "+re" (paro_ret__), "+m" (var) \
		: "+r" (paro_ret__), "+m" (var) \
		: : "memory"); \
		break; \
		default: __bad_percpu_size(); \

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