From ae07f551c42d6e4162436ca452a199deac9dab4d Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Thu, 3 Feb 2011 14:27:25 +1100 Subject: [PATCH] tracing/syscalls: Early terminate search for sys_ni_syscall Many system calls are unimplemented and mapped to sys_ni_syscall, but at boot ftrace would still search through every syscall metadata entry for a match which wouldn't be there. This patch adds causes the search to terminate early if the system call is not mapped. Signed-off-by: Ian Munsie LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> Signed-off-by: Steven Rostedt --- kernel/trace/trace_syscalls.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 86a23e7de031..ee7b5a0bb9f8 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -85,6 +85,9 @@ find_syscall_meta(unsigned long syscall) stop = __stop_syscalls_metadata; kallsyms_lookup(syscall, NULL, NULL, NULL, str); + if (arch_syscall_match_sym_name(str, "sys_ni_syscall")) + return NULL; + for ( ; start < stop; start++) { if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name)) return *start; -- 2.20.1