linux-sg2042/arch/arm64/lib/atomic_ll_sc.c

#include <asm/atomic.h>
#define __ARM64_IN_ATOMIC_IMPL
#include <asm/atomic_ll_sc.h>
arm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics In order to patch in the new atomic instructions at runtime, we need to generate wrappers around the out-of-line exclusive load/store atomics. This patch adds a new Kconfig option, CONFIG_ARM64_LSE_ATOMICS. which causes our atomic functions to branch to the out-of-line ll/sc implementations. To avoid the register spill overhead of the PCS, the out-of-line functions are compiled with specific compiler flags to force out-of-line save/restore of any registers that are usually caller-saved. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> 2015-02-03 20:39:03 +08:00			`#include <asm/atomic.h>`
			`#define __ARM64_IN_ATOMIC_IMPL`
			`#include <asm/atomic_ll_sc.h>`