From: Nelson Elhage Date: Mon, 19 Dec 2011 13:39:30 +0000 (-0500) Subject: perf evlist: Fix errno value reporting on failed mmap X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=301b195db179241da8be25f345f3c4e64960f1d5;p=mv-sheeva.git 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 Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1324301972-22740-2-git-send-email-nelhage@nelhage.com Signed-off-by: Nelson Elhage Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 8b19e7a1e88..963d63dde45 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -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;