Messages in this thread Patch in this message |  | | | Date | Tue, 08 Feb 2011 17:16:17 -0500 | | From | Steven Rostedt <> | | Subject | [PATCH 05/10] tracing/syscalls: Early terminate search for sys_ni_syscall |
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From: Ian Munsie <imunsie@au1.ibm.com>
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> --- 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 86a23e7..ee7b5a0 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; -- 1.7.2.3
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