mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-24 23:04:17 +08:00
657eef0a54
Currently CONFIG_ARM64_USE_LSE_ATOMICS depends upon CONFIG_JUMP_LABEL,
as the inline atomics were indirected with a static branch.
However, since commit:
21fb26bfb0 ("arm64: alternatives: add alternative_has_feature_*()")
... we use an alternative_branch (which is always available) rather than
a static branch, and hence the dependency is unnecessary.
Remove the stale dependency, along with the stale include. This will
allow the use of LSE atomics in kernels built with CONFIG_JUMP_LABEL=n,
and reduces the risk of circular header dependencies via <asm/lse.h>.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20221114125424.2998268-1-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_LSE_H
|
|
#define __ASM_LSE_H
|
|
|
|
#include <asm/atomic_ll_sc.h>
|
|
|
|
#ifdef CONFIG_ARM64_LSE_ATOMICS
|
|
|
|
#define __LSE_PREAMBLE ".arch_extension lse\n"
|
|
|
|
#include <linux/compiler_types.h>
|
|
#include <linux/export.h>
|
|
#include <linux/stringify.h>
|
|
#include <asm/alternative.h>
|
|
#include <asm/alternative-macros.h>
|
|
#include <asm/atomic_lse.h>
|
|
#include <asm/cpucaps.h>
|
|
|
|
static __always_inline bool system_uses_lse_atomics(void)
|
|
{
|
|
return alternative_has_feature_likely(ARM64_HAS_LSE_ATOMICS);
|
|
}
|
|
|
|
#define __lse_ll_sc_body(op, ...) \
|
|
({ \
|
|
system_uses_lse_atomics() ? \
|
|
__lse_##op(__VA_ARGS__) : \
|
|
__ll_sc_##op(__VA_ARGS__); \
|
|
})
|
|
|
|
/* In-line patching at runtime */
|
|
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
|
|
ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
|
|
|
|
#else /* CONFIG_ARM64_LSE_ATOMICS */
|
|
|
|
static inline bool system_uses_lse_atomics(void) { return false; }
|
|
|
|
#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__)
|
|
|
|
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
|
|
|
|
#endif /* CONFIG_ARM64_LSE_ATOMICS */
|
|
#endif /* __ASM_LSE_H */
|