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authorLi Zefan2010-08-23 16:50:12 +0800
committerSteven Rostedt2010-08-31 16:46:23 -0400
commit3aaba20f26f58843e8f20611e5c0b1c06954310f (patch)
treead15d7aa21af465ddf6091eb490d84312089f245 /crypto
parentfa66f07aa1f0950e1dc78b7ab39728b3f8aa77a1 (diff)
tracing: Fix a race in function profile
While we are reading trace_stat/functionX and someone just disabled function_profile at that time, we can trigger this: divide error: 0000 [#1] PREEMPT SMP ... EIP is at function_stat_show+0x90/0x230 ... This fix just takes the ftrace_profile_lock and checks if rec->counter is 0. If it's 0, we know the profile buffer has been reset. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: stable@kernel.org LKML-Reference: <4C723644.4040708@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions