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>

diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index 9abddde372abfbb11934f93da2e39924fe4116d3..24103fa57b54e8332a099dbdb7288ede6616a9f6 100644 (file)
--- 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__ */