On Tue, Mar 17, 2026 at 9:20 AM Jinjie Ruan <[email protected]> wrote:
> Use syscall_get_nr() to get syscall number for syscall_trace_enter(). > This aligns arm64's internal tracing logic with the generic > entry framework. > > [Changes] > 1. Use syscall_get_nr() helper: > - Replace direct regs->syscallno access with > syscall_get_nr(current, regs). > - This helper is functionally equivalent to direct access on arm64. > > 2. Re-read syscall number after tracepoint: > - Re-fetch the syscall number after trace_sys_enter() as it may have > been modified by BPF or ftrace probes, matching generic entry behavior. > > [Why this matters] > - Aligns arm64 with the generic entry interface. > - Makes future migration to generic entry framework. > - Properly handles syscall number modifications by tracers. > - Uses standard architecture-independent helpers. > > No functional changes intended. > > Cc: Will Deacon <[email protected]> > Cc: Catalin Marinas <[email protected]> > Reviewed-by: Kevin Brodsky <[email protected]> > Signed-off-by: Jinjie Ruan <[email protected]> Reviewed-by: Linus Walleij <[email protected]> Yours, Linus Walleij
