linux-kernel - BUG: different symbol address between System.map and /proc/kallsyms

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Message-ID: <4B2ECD47.7040202@cn.fujitsu.com>
Date:	Mon, 21 Dec 2009 09:20:07 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: BUG: different symbol address between System.map and /proc/kallsyms

Hi,

The symbol address in System.map and /proc/kallsys is different:

# cat System.map | grep _text
  c1000000 T _text
# cat /proc/kallsyms | grep _text
  c0100000 T _text

# readelf -s vmlinux | grep _text
35078: c1000000     0 NOTYPE  GLOBAL DEFAULT    1 _text

So, perf can't get sysmbol address properly:

# ./perf report
# Samples: 29
#
# Overhead  Command        Shared Object  Symbol
# ........  .......  ...................  ......
#
    93.10%    sleep             c014f988  [k] 0x000000c014f988
     3.45%    sleep  libc-2.9.90.so       [.] _int_malloc
     3.45%    sleep  [kernel]             [k] 0x000000c014f988
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