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| author | Ingo Molnar <mingo@elte.hu> | 2010-04-15 09:35:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-15 09:36:16 +0200 |
| commit | b257c14ceb1194a6181144210056d38f22127189 (patch) | |
| tree | c803925f1d5bf2237e7495d306bf43929df0c952 /kernel/trace/trace_event_perf.c | |
| parent | 371fd7e7a56a5c136d31aa980011bd2f131c3ef5 (diff) | |
| parent | 2ba3abd8186f24c7fb418927025b4e2120e3a362 (diff) | |
| download | kernel_samsung_smdk4412-b257c14ceb1194a6181144210056d38f22127189.zip kernel_samsung_smdk4412-b257c14ceb1194a6181144210056d38f22127189.tar.gz kernel_samsung_smdk4412-b257c14ceb1194a6181144210056d38f22127189.tar.bz2 | |
Merge branch 'linus' into sched/core
Merge reason: merge the latest fixes, update to -rc4.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_event_perf.c')
| -rw-r--r-- | kernel/trace/trace_event_perf.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 81f691e..0565bb4 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -17,7 +17,12 @@ EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs); static char *perf_trace_buf; static char *perf_trace_buf_nmi; -typedef typeof(char [PERF_MAX_TRACE_SIZE]) perf_trace_t ; +/* + * Force it to be aligned to unsigned long to avoid misaligned accesses + * suprises + */ +typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)]) + perf_trace_t; /* Count the events in use (per event id, not per instance) */ static int total_ref_count; @@ -130,6 +135,8 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned short type, char *trace_buf, *raw_data; int pc, cpu; + BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long)); + pc = preempt_count(); /* Protect the per cpu buffer, begin the rcu read side */ @@ -152,7 +159,7 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned short type, raw_data = per_cpu_ptr(trace_buf, cpu); /* zero the dead bytes from align to not leak stack to user */ - *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; + memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64)); entry = (struct trace_entry *)raw_data; tracing_generic_entry_update(entry, *irq_flags, pc); |