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ARM: 8829/1: spinlock: use unified assembler language syntax

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Convert the conditional infix to a postfix to make sure this inline
assembly is unified syntax. Since gcc assumes non-unified syntax
when emitting ARM instructions, make sure to define the syntax as
unified.

This allows to use LLVM's integrated assembler.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Stefan Agner 2019-01-24 21:43:40 +01:00 committed by Russell King
parent 32fdb046ac
commit eb7ff9023e
1 changed files with 2 additions and 1 deletions
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3
arch/arm/include/asm/spinlock.h
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@ -210,11 +210,12 @@ static inline void arch_read_lock(arch_rwlock_t *rw)
prefetchw(&rw->lock);
__asm__ __volatile__(
" .syntax unified\n"
"1: ldrex %0, [%2]\n"
" adds %0, %0, #1\n"
" strexpl %1, %0, [%2]\n"
WFE("mi")
" rsbpls %0, %1, #0\n"
" rsbspl %0, %1, #0\n"
" bmi 1b"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (&rw->lock)