From 8af25d0a2e465f3cb73c47c605fddd1664ee79b2 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 7 Jul 2026 21:06:36 +0200 Subject: [PATCH] entry: Use syscall number instead of rereading it MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit rseq_syscall_enter_work() is invoked before the syscall number can be modified. So there is no point in rereading it from pt_regs. Signed-off-by: Thomas Gleixner Tested-by: Mukesh Kumar Chaurasiya (IBM) Reviewed-by: Radu Rendec Reviewed-by: Jinjie Ruan Reviewed-by: Mukesh Kumar Chaurasiya (IBM) Reviewed-by: Philippe Mathieu-Daudé Link: https://patch.msgid.link/20260707190254.181086755@kernel.org --- include/linux/entry-common.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h index c0f6464ca96b..c8373525bdb1 100644 --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -70,9 +70,10 @@ static inline void syscall_enter_audit(struct pt_regs *regs, long syscall) } } -static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work) +static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work, + long syscall) { - long syscall, ret = 0; + long ret = 0; /* * Handle Syscall User Dispatch. This must comes first, since @@ -90,7 +91,7 @@ static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned l * through hrtimer_interrupt(). */ if (work & SYSCALL_WORK_SYSCALL_RSEQ_SLICE) - rseq_syscall_enter_work(syscall_get_nr(current, regs)); + rseq_syscall_enter_work(syscall); /* Handle ptrace */ if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) { @@ -145,7 +146,7 @@ static __always_inline long syscall_enter_from_user_mode_work(struct pt_regs *re unsigned long work = READ_ONCE(current_thread_info()->syscall_work); if (work & SYSCALL_WORK_ENTER) - syscall = syscall_trace_enter(regs, work); + syscall = syscall_trace_enter(regs, work, syscall); return syscall; }