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arm/syscalls: mark syscall invocation as likely in invoke_syscall

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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>
This commit is contained in:
Can Peng 2025-09-19 18:00:42 +08:00 committed by Will Deacon
parent b3cf07851b
commit da9e5c04be
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/syscall.c
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@ -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);