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perf evlist: Fix errno value reporting on failed mmap 

On failure, perf_evlist__mmap_per_{cpu,thread} will try to munmap()
every map that doesn't have a NULL base. This will fail with EINVAL if
one of them has base == MAP_FAILED, clobbering errno, so that
perf_evlist__map will return EINVAL on any failure regardless of the
root cause.

Fix this by resetting failed maps to a NULL base.

Acked-by: Namhyung Kim <namhyung@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1324301972-22740-2-git-send-email-nelhage@nelhage.com
Signed-off-by: Nelson Elhage <nelhage@nelhage.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Nelson Elhage 2011-12-19 08:39:30 -05:00 committed by Arnaldo Carvalho de Melo
parent 6581f6e35f
commit 301b195db1
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/evlist.c
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@ -447,8 +447,10 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
evlist->mmap[idx].mask = mask;
evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
MAP_SHARED, fd, 0);
if (evlist->mmap[idx].base == MAP_FAILED)
if (evlist->mmap[idx].base == MAP_FAILED) {
evlist->mmap[idx].base = NULL;
return -1;
}
perf_evlist__add_pollfd(evlist, fd);
return 0;