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Message-Id: <ad0fbab91f337ec99e3a2a3d60886a785da34366.1546551693.git.stefan@agner.ch>
Date: Thu, 3 Jan 2019 22:48:15 +0100
From: Stefan Agner <stefan@...er.ch>
To: linux@...linux.org.uk
Cc: ndesaulniers@...gle.com, natechancellor@...il.com, arnd@...db.de,
ard.biesheuvel@...aro.org, nicolas.pitre@...aro.org,
peterz@...radead.org, mingo@...hat.com, will.deacon@....com,
julien.thierry@....com, mark.rutland@....com,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Stefan Agner <stefan@...er.ch>
Subject: [PATCH v2 3/3] ARM: spinlock: use unified assembler language syntax
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@...er.ch>
---
Changes since v1:
- Explicitly use unified syntax for inline assembly
arch/arm/include/asm/spinlock.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/spinlock.h b/arch/arm/include/asm/spinlock.h
index 099c78fcf62d..8f009e788ad4 100644
--- a/arch/arm/include/asm/spinlock.h
+++ b/arch/arm/include/asm/spinlock.h
@@ -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)
--
2.20.1
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