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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2018-05-04 18:44:24 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2018-05-07 21:29:30 +1000
commit0b7758aaf6543b9a10c8671db559e9d374a3fd95 (patch)
treefa542503c8f9a04d35cad225003d906e27e24e2a
parentc4ec1f0353b342473b93637fd0c3fb524bedbb2d (diff)
downloadlinux-0b7758aaf6543b9a10c8671db559e9d374a3fd95.tar.bz2
powerpc/trace/syscalls: Update syscall name matching logic
On powerpc64 ABIv1, we are enabling syscall tracing for only ~20 syscalls. This is due to commit e145242ea0df6 ("syscalls/core, syscalls/x86: Clean up syscall stub naming convention") which has changed the syscall entry wrapper prefix from "SyS" to "__se_sys". Update the logic for ABIv1 to not just skip the initial dot, but also the "__se_sys" prefix. Fixes: commit e145242ea0df6 ("syscalls/core, syscalls/x86: Clean up syscall stub naming convention") Reported-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
-rw-r--r--arch/powerpc/include/asm/ftrace.h10
1 files changed, 3 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index 9abddde372ab..24103fa57b54 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -73,13 +73,9 @@ struct dyn_arch_ftrace {
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
- /*
- * Compare the symbol name with the system call name. Skip the .sys or .SyS
- * prefix from the symbol name and the sys prefix from the system call name and
- * just match the rest. This is only needed on ppc64 since symbol names on
- * 32bit do not start with a period so the generic function will work.
- */
- return !strcmp(sym + 4, name + 3);
+ /* We need to skip past the initial dot, and the __se_sys alias */
+ return !strcmp(sym + 1, name) ||
+ (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name));
}
#endif
#endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */