linux-kernel - [tip:perf/urgent] perf symbols: Properly align symbol_conf.priv

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Date:	Wed, 30 Mar 2011 07:17:18 GMT
From:	"tip-bot for David S. Miller" <davem@...emloft.net>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	davem@...emloft.net, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf symbols: Properly align symbol_conf.priv_size

Commit-ID:  4d439517561d009e170e2fe20be1ba25e19abe75
Gitweb:     http://git.kernel.org/tip/4d439517561d009e170e2fe20be1ba25e19abe75
Author:     David S. Miller <davem@...emloft.net>
AuthorDate: Tue, 29 Mar 2011 14:18:39 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 29 Mar 2011 14:18:39 -0300

perf symbols: Properly align symbol_conf.priv_size

If symbol_conf.priv_size is not a multiple of "sizeof(u64)" we'll bus
error on sparc64 in symbol__new because the "struct symbol *" pointer
is computed by adding symbol_conf.priv_size to the memory allocated.

We cannot isolate the fix to symbol__new and symbol__delete since the
private area is computed by subtracting the priv_size value from a
"struct symbol" pointer, so then the private area can still be
potentially unaligned.

So, simply align the symbol_conf.priv_size value in symbol__init()

Cc: Ingo Molnar <mingo@...e.hu>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20110328.175849.112593455.davem@...emloft.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 8f73907..f06c10f 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2406,6 +2406,8 @@ int symbol__init(void)
 	if (symbol_conf.initialized)
 		return 0;
 
+	symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
+
 	elf_version(EV_CURRENT);
 	if (symbol_conf.sort_by_name)
 		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
--
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