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>
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@ -85,6 +85,9 @@ find_syscall_meta(unsigned long syscall)
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stop = __stop_syscalls_metadata;
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stop = __stop_syscalls_metadata;
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kallsyms_lookup(syscall, NULL, NULL, NULL, str);
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kallsyms_lookup(syscall, NULL, NULL, NULL, str);
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if (arch_syscall_match_sym_name(str, "sys_ni_syscall"))
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return NULL;
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for ( ; start < stop; start++) {
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for ( ; start < stop; start++) {
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if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
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if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
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return *start;
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return *start;
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