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entry: Use syscall number instead of rereading it

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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 <tglx@kernel.org>
Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Link: https://patch.msgid.link/20260707190254.181086755@kernel.org
This commit is contained in:
Thomas Gleixner
2026-07-12 12:38:01 +02:00
parent bad2a27ba8
commit 8af25d0a2e
1 changed files with 5 additions and 4 deletions
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include/linux/entry-common.h
+5 -4
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@@ -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;
}