linux-kernel - [PATCH 1/1] perf tools: elf_sym__is_function should accept "zero" sized functions

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Date:	Mon,  5 Oct 2009 23:35:03 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>
Subject: [PATCH 1/1] perf tools: elf_sym__is_function should accept "zero" sized functions

Asm routines that end up having size equal to zero are not really zero
sized, and as now we do kernel_maps__fixup_sym_end, at least for kernel
routines this gets fixed.

A similar fixup needs to be done for the userspace bits as well, but as
this fixup started only because in /proc/kallsyms we don't have the end
address nor the function size, it appeared here first.

Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mike Galbraith <efault@....de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e3eebdd..582ce72 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -396,8 +396,7 @@ static inline int elf_sym__is_function(const GElf_Sym *sym)
 {
 	return elf_sym__type(sym) == STT_FUNC &&
 	       sym->st_name != 0 &&
-	       sym->st_shndx != SHN_UNDEF &&
-	       sym->st_size != 0;
+	       sym->st_shndx != SHN_UNDEF;
 }
 
 static inline int elf_sym__is_label(const GElf_Sym *sym)
-- 
1.6.2.5

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