Commit-ID: 85cb68b27c428d477169f3aa46c72dba103a17bd
Gitweb: http://git.kernel.org/tip/85cb68b27c428d477169f3aa46c72dba103a17bd
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Thu, 20 May 2010 10:34:59 +0200
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Thu, 20 May 2010 11:21:57 +0200
perf: Fix unaligned accesses while fetching trace values
Accessing trace values of an 8 size may end up in a segfault
on archs that can't deal with misaligned access, which is the
case for sparc 64. This is because PERF_SAMPLE_RAW are aligned
to 4 and not to 8.
Fix this on the macros that get the values of 8 size.
This fixes segfaults on perf tools in sparc 64.
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
---
tools/perf/util/trace-event.h | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 406d452..b3e86b1 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -233,7 +233,12 @@ static inline unsigned long long __data2host8(unsigned long long data)
#define data2host2(ptr) __data2host2(*(unsigned short *)ptr)
#define data2host4(ptr) __data2host4(*(unsigned int *)ptr)
-#define data2host8(ptr) __data2host8(*(unsigned long long *)ptr)
+#define data2host8(ptr) ({ \
+ unsigned long long __val; \
+ \
+ memcpy(&__val, (ptr), sizeof(unsigned long long)); \
+ __data2host8(__val); \
+})
extern int header_page_ts_offset;
extern int header_page_ts_size;
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|