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| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2010-05-19 01:19:17 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-19 09:41:05 +0200 |
| commit | 623aab896ee1a532cb540bcf0d5ae8a88275afd5 (patch) | |
| tree | ff839554cc1cc2d775ed62e28a3e6a2d54308fd3 /arch | |
| parent | 151f85a471d29fc81f70348143d009a729901bc0 (diff) | |
| download | linux-623aab896ee1a532cb540bcf0d5ae8a88275afd5.tar.gz linux-623aab896ee1a532cb540bcf0d5ae8a88275afd5.tar.bz2 linux-623aab896ee1a532cb540bcf0d5ae8a88275afd5.zip | |
perf, x86: P4 PMU -- do a real check for ESCR address being in hash
To prevent from clashes in future code modifications
do a real check for ESCR address being in hash. At
moment the callers are known to pass sane values but
better to be on a safe side.
And comment fix.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Lin Ming <ming.m.lin@intel.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100518212439.004503600@openvz.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_p4.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c index 87e1803e67a6..5f8e36d62793 100644 --- a/arch/x86/kernel/cpu/perf_event_p4.c +++ b/arch/x86/kernel/cpu/perf_event_p4.c @@ -670,7 +670,7 @@ static void p4_pmu_swap_config_ts(struct hw_perf_event *hwc, int cpu) /* * ESCR address hashing is tricky, ESCRs are not sequential - * in memory but all starts from MSR_P4_BSU_ESCR0 (0x03e0) and + * in memory but all starts from MSR_P4_BSU_ESCR0 (0x03a0) and * the metric between any ESCRs is laid in range [0xa0,0xe1] * * so we make ~70% filled hashtable @@ -735,8 +735,9 @@ static int p4_get_escr_idx(unsigned int addr) { unsigned int idx = P4_ESCR_MSR_IDX(addr); - if (unlikely(idx >= P4_ESCR_MSR_TABLE_SIZE || - !p4_escr_table[idx])) { + if (unlikely(idx >= P4_ESCR_MSR_TABLE_SIZE || + !p4_escr_table[idx] || + p4_escr_table[idx] != addr)) { WARN_ONCE(1, "P4 PMU: Wrong address passed: %x\n", addr); return -1; } |