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arm: use a_ll/a_sc atomics when building for ARMv6T2 

ARMv6 cores with support for Thumb2 can take advantage of the "ldrex"
and "strex" based implementations of a_ll and a_sc.
This commit is contained in:
Andre McCurdy 2018-04-18 18:51:44 -07:00 committed by Rich Felker
parent 749a06b4c5
commit 8c2943f057
1 changed files with 1 additions and 1 deletions
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2
arch/arm/atomic_arch.h
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@ -8,7 +8,7 @@ extern uintptr_t __attribute__((__visibility__("hidden")))
__a_cas_ptr, __a_barrier_ptr;
#if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6KZ__ || __ARM_ARCH_6ZK__) && !__thumb__) \
|| __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
|| __ARM_ARCH_6T2__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
#define a_ll a_ll
static inline int a_ll(volatile int *p)