linux-kernel - [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI

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Message-Id: <20221201161442.2127231-1-mjeanson@efficios.com>
Date:   Thu,  1 Dec 2022 11:14:42 -0500
From:   Michael Jeanson <mjeanson@...icios.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Michael Jeanson <mjeanson@...icios.com>, stable@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michal Suchanek <msuchanek@...e.de>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI_V1

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.

Fixes: 68b34588e202 ("powerpc/64/sycall: Implement syscall entry/exit logic in C")
Cc: stable@...r.kernel.org # v5.7+
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Michal Suchanek <msuchanek@...e.de>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Michael Jeanson <mjeanson@...icios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.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