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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2018-05-04 18:44:24 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-05-07 21:29:30 +1000 |
| commit | 0b7758aaf6543b9a10c8671db559e9d374a3fd95 (patch) | |
| tree | fa542503c8f9a04d35cad225003d906e27e24e2a | |
| parent | c4ec1f0353b342473b93637fd0c3fb524bedbb2d (diff) | |
| download | linux-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.h | 10 |
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__ */ |