Commit 85cb68b2 authored May 20, 2010 by Frederic Weisbecker

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@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: David Miller <davem@davemloft.net>

parent 49f135ed

tools/perf/util/trace-event.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -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;