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| author | Can Peng <pengcan@kylinos.cn> | 2025-09-19 18:00:42 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-09-22 13:26:16 +0100 |
| commit | da9e5c04be589524101aac31746902b6803581e4 (patch) | |
| tree | 50872b7e839e3f43fe1dff01f608f100e9b03e5a | |
| parent | arm64: entry: Switch to generic IRQ entry (diff) | |
| download | linux-da9e5c04be589524101aac31746902b6803581e4.tar.gz linux-da9e5c04be589524101aac31746902b6803581e4.zip | |
arm/syscalls: mark syscall invocation as likely in invoke_syscall
The invoke_syscall() function is overwhelmingly called for
valid system call entries. Annotate the main path with likely()
to help the compiler generate better branch prediction hints,
reducing CPU pipeline stalls due to mispredictions.
This is a micro-optimization targeting syscall-heavy workloads [1].
Link: https://lore.kernel.org/r/20250922121730.986761-1-pengcan@kylinos.cn [1]
Signed-off-by: Can Peng <pengcan@kylinos.cn>
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/arm64/kernel/syscall.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index c442fcec6b9e..aba7ca6bca2d 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -43,7 +43,7 @@ static void invoke_syscall(struct pt_regs *regs, unsigned int scno, add_random_kstack_offset(); - if (scno < sc_nr) { + if (likely(scno < sc_nr)) { syscall_fn_t syscall_fn; syscall_fn = syscall_table[array_index_nospec(scno, sc_nr)]; ret = __invoke_syscall(regs, syscall_fn); |