linux-kernel - [PATCH] perf probe powerpc: Ignore SyS symbols irrespective of endianness

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Date:   Tue, 28 Aug 2018 14:38:48 +0530
From:   Sandipan Das <sandipan@...ux.ibm.com>
To:     acme@...nel.org
Cc:     linux-kernel@...r.kernel.org, jolsa@...hat.com,
        ravi.bangoria@...ux.ibm.com, naveen.n.rao@...ux.vnet.ibm.com,
        kamalesh@...ux.vnet.ibm.com
Subject: [PATCH] perf probe powerpc: Ignore SyS symbols irrespective of endianness

This makes sure that the SyS symbols are ignored for any powerpc
system, not just the big endian ones.

Fixes: fb6d59423115 ("perf probe ppc: Use the right prefix when ignoring SyS symbols on ppc")
Reported-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Signed-off-by: Sandipan Das <sandipan@...ux.ibm.com>
Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
---
 tools/perf/arch/powerpc/util/sym-handling.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index 20e7d74d86cd..10a44e946f77 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -22,15 +22,16 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
 
 #endif
 
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
 int arch__choose_best_symbol(struct symbol *syma,
 			     struct symbol *symb __maybe_unused)
 {
 	char *sym = syma->name;
 
+#if !defined(_CALL_ELF) || _CALL_ELF != 2
 	/* Skip over any initial dot */
 	if (*sym == '.')
 		sym++;
+#endif
 
 	/* Avoid "SyS" kernel syscall aliases */
 	if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
@@ -41,6 +42,7 @@ int arch__choose_best_symbol(struct symbol *syma,
 	return SYMBOL_A;
 }
 
+#if !defined(_CALL_ELF) || _CALL_ELF != 2
 /* Allow matching against dot variants */
 int arch__compare_symbol_names(const char *namea, const char *nameb)
 {
-- 
2.14.4