Michael Jeanson <mjean...@efficios.com> writes:
> In v5.7 the powerpc syscall entry/exit logic was rewritten in C, on
> PPC64_ELF_ABI_V1 this resulted in the symbols in the syscall table
> changing from their dot prefixed variant to the non-prefixed ones.
>
> Since ftrace prefixes a dot to the syscall names when matching them to
> build its syscall event list, this resulted in no syscall events being
> available.
>
> Remove the PPC64_ELF_ABI_V1 specific version of
> arch_syscall_match_sym_name to have the same behavior across all powerpc
> variants.
This doesn't seem to work for me.
Event with it applied I still don't see anything in
/sys/kernel/debug/tracing/events/syscalls
Did we break it in some other way recently?
cheers
> Fixes: 68b34588e202 ("powerpc/64/sycall: Implement syscall entry/exit logic
> in C")
> Cc: sta...@vger.kernel.org # v5.7+
> Cc: Steven Rostedt <rost...@goodmis.org>
> Cc: Masami Hiramatsu <mhira...@kernel.org>
> Cc: Mark Rutland <mark.rutl...@arm.com>
> Cc: Michael Ellerman <m...@ellerman.id.au>
> Cc: Nicholas Piggin <npig...@gmail.com>
> Cc: Christophe Leroy <christophe.le...@csgroup.eu>
> Cc: Michal Suchanek <msucha...@suse.de>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-ker...@vger.kernel.org
> Signed-off-by: Michael Jeanson <mjean...@efficios.com>
> Reviewed-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
> ---
> arch/powerpc/include/asm/ftrace.h | 12 ------------
> 1 file changed, 12 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/ftrace.h
> b/arch/powerpc/include/asm/ftrace.h
> index 3cee7115441b..e3d1f377bc5b 100644
> --- a/arch/powerpc/include/asm/ftrace.h
> +++ b/arch/powerpc/include/asm/ftrace.h
> @@ -64,17 +64,6 @@ void ftrace_graph_func(unsigned long ip, unsigned long
> parent_ip,
> * those.
> */
> #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
> -#ifdef CONFIG_PPC64_ELF_ABI_V1
> -static inline bool arch_syscall_match_sym_name(const char *sym, const char
> *name)
> -{
> - /* 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)) ||
> - (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
> - (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
> - (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
> -}
> -#else
> static inline bool arch_syscall_match_sym_name(const char *sym, const char
> *name)
> {
> return !strcmp(sym, name) ||
> @@ -83,7 +72,6 @@ static inline bool arch_syscall_match_sym_name(const char
> *sym, const char *name
> (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
> (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
> }
> -#endif /* CONFIG_PPC64_ELF_ABI_V1 */
> #endif /* CONFIG_FTRACE_SYSCALLS */
>
> #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
> --
> 2.34.1
