From: Will Deacon <will.deacon@arm.com>
Date: Tue, 18 Sep 2018 09:39:55 +0100
Subject: arm64: cmpxchg: Use "K" instead of "L" for ll/sc immediate constraint
Git-commit: 4230509978f2921182da4e9197964dccdbe463c3
Patch-mainline: v5.0-rc1
References: git-fixes

The "L" AArch64 machine constraint, which we use for the "old" value in
an LL/SC cmpxchg(), generates an immediate that is suitable for a 64-bit
logical instruction. However, for cmpxchg() operations on types smaller
than 64 bits, this constraint can result in an invalid instruction which
is correctly rejected by GAS, such as EOR W1, W1, #0xffffffff.

Whilst we could special-case the constraint based on the cmpxchg size,
it's far easier to change the constraint to "K" and put up with using
a register for large 64-bit immediates. For out-of-line LL/SC atomics,
this is all moot anyway.

Reported-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Ivan T. Ivanov <iivanov@suse.de>
---
 arch/arm64/include/asm/atomic_ll_sc.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/include/asm/atomic_ll_sc.h
+++ b/arch/arm64/include/asm/atomic_ll_sc.h
@@ -267,7 +267,7 @@ __LL_SC_PREFIX(__cmpxchg_case_##name(vol
 	"2:"								\
 	: [tmp] "=&r" (tmp), [oldval] "=&r" (oldval),			\
 	  [v] "+Q" (*(unsigned long *)ptr)				\
-	: [old] "Lr" (old), [new] "r" (new)				\
+	: [old] "Kr" (old), [new] "r" (new)				\
 	: cl);								\
 									\
 	return oldval;							\