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| author | Jiri Olsa <jolsa@redhat.com> | 2012-03-23 15:41:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-03-24 08:46:59 +0100 |
| commit | b01c3a0010aabadf745f3e7fdb9cab682e0a28a2 (patch) | |
| tree | de5fab4234ea646edbbac28f3d7dfb28f28bb601 /kernel/events | |
| parent | 04a54d27ce9698d108d29c8a6a50c28f7446336b (diff) | |
| download | linux-b01c3a0010aabadf745f3e7fdb9cab682e0a28a2.tar.bz2 | |
perf: Move mmap page data_head offset assertion out of header
Having the build time assertion in header is making the perf
build fail on x86 with:
../../include/linux/perf_event.h:411:32: error: variably modified \
‘__assert_mmap_data_head_offset’ at file scope [-Werror]
I'm moving the build time validation out of the header, because
I think it's better than to lessen the perf build warn/error
check.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: acme@redhat.com
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Cc: cjashfor@linux.vnet.ibm.com
Cc: fweisbec@gmail.com
Link: http://lkml.kernel.org/r/1332513680-7870-1-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index dc3b05272511..3f92a19aa11e 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7116,6 +7116,13 @@ void __init perf_event_init(void) /* do not patch jump label more than once per second */ jump_label_rate_limit(&perf_sched_events, HZ); + + /* + * Build time assertion that we keep the data_head at the intended + * location. IOW, validation we got the __reserved[] size right. + */ + BUILD_BUG_ON((offsetof(struct perf_event_mmap_page, data_head)) + != 1024); } static int __init perf_event_sysfs_init(void) |