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| author | Paul Mackerras <paulus@samba.org> | 2009-12-15 11:40:32 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-15 15:09:55 +0300 |
| commit | 0f624e7e5625f4c30c836b7a5decfe2553582391 (patch) | |
| tree | 6de6f9fbb15db70007238c923efb48dcde194c20 /tools | |
| parent | a6005123ce22770dbd91bc3cb637ce0807ab959b (diff) | |
| download | linux-0f624e7e5625f4c30c836b7a5decfe2553582391.tar.xz | |
perf_event: Fix incorrect range check on cpu number
It is quite legitimate for CPUs to be numbered sparsely, meaning
that it possible for an online CPU to have a number which is
greater than the total count of possible CPUs.
Currently find_get_context() has a sanity check on the cpu
number where it checks it against num_possible_cpus(). This
test can fail for a legitimate cpu number if the
cpu_possible_mask is sparsely populated.
This fixes the problem by checking the CPU number against
nr_cpumask_bits instead, since that is the appropriate check to
ensure that the cpu number is same to pass to cpu_isset()
subsequently.
Reported-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Tested-by: Michael Neuling <mikey@neuling.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@kernel.org>
LKML-Reference: <20091215084032.GA18661@brick.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions