15898055b7
Since we are compiling for a single chipset that is known to support LSE, the system_uses_lse_atomics() static branch can be eliminated entirely. Therefore, make system_uses_lse_atomics() always true to always use LSE atomics, and update ARM64_LSE_ATOMIC_INSN() users to get rid of the extra nops used for alternatives patching at runtime. This reduces generated code size by removing LL/SC atomics, which improves instruction cache footprint. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
44 lines
1.1 KiB
C
Executable file
44 lines
1.1 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_LSE_H
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#define __ASM_LSE_H
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#include <asm/atomic_ll_sc.h>
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#if defined(CONFIG_ARM64_LSE_ATOMICS) && !defined(BUILD_FIPS140_KO)
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#define __LSE_PREAMBLE ".arch_extension lse\n"
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#include <linux/compiler_types.h>
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#include <linux/export.h>
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#include <linux/jump_label.h>
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#include <linux/stringify.h>
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#include <asm/alternative.h>
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#include <asm/atomic_lse.h>
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#include <asm/cpucaps.h>
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extern struct static_key_false cpu_hwcap_keys[ARM64_NCAPS];
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extern struct static_key_false arm64_const_caps_ready;
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/* Always use LSE atomics */
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#define system_uses_lse_atomics() true
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#define __lse_ll_sc_body(op, ...) \
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({ \
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system_uses_lse_atomics() ? \
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__lse_##op(__VA_ARGS__) : \
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__ll_sc_##op(__VA_ARGS__); \
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})
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/* Always use LSE atomics */
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#define ARM64_LSE_ATOMIC_INSN(lse) __LSE_PREAMBLE lse
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#else /* CONFIG_ARM64_LSE_ATOMICS */
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static inline bool system_uses_lse_atomics(void) { return false; }
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#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__)
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
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#endif /* CONFIG_ARM64_LSE_ATOMICS */
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#endif /* __ASM_LSE_H */
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