提交 53020fe8 编写于 作者: P Peter Zijlstra 提交者: Ingo Molnar

perf_counter: Fix perf_output_copy() WARN to account for overflow

The simple reservation test in perf_output_copy() failed to take
unsigned int overflow into account, fix this.

[ Impact: fix false positive warning with more than 4GB of profiling data ]
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 a026dfec
......@@ -1927,7 +1927,11 @@ static void perf_output_copy(struct perf_output_handle *handle,
handle->offset = offset;
WARN_ON_ONCE(handle->offset > handle->head);
/*
* Check we didn't copy past our reservation window, taking the
* possible unsigned int wrap into account.
*/
WARN_ON_ONCE(((int)(handle->head - handle->offset)) < 0);
}
#define perf_output_put(handle, x) \
......
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