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| author | Ian Munsie <imunsie@au1.ibm.com> | 2011-02-03 04:27:25 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2011-02-08 03:30:14 +0100 |
| commit | ae07f551c42d6e4162436ca452a199deac9dab4d (patch) | |
| tree | 88041bf32c4ee8788ef1b909539d0a42fcd9f3f9 /kernel | |
| parent | tracing/syscalls: Allow arch specific syscall symbol matching (diff) | |
| download | linux-ae07f551c42d6e4162436ca452a199deac9dab4d.tar.xz linux-ae07f551c42d6e4162436ca452a199deac9dab4d.zip | |
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 <imunsie@au1.ibm.com>
LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; |