From a7402c943bb4657cc0b44453177803fbead70990 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Tue, 6 Feb 2018 19:18:13 +0100 Subject: [PATCH] perf tools: Fix comment for sort__* compare functions In commit 2f15bd8c6c6e ("perf tools: Fix "Command" sort_entry's cmp and collapse function") we switched from pointer to string comparison. But failed to remove related comments. Removing them and adding another one to warn before pointer comparison in here. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20180206181813.10943-18-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/sort.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c index 2da4d04..e8514f6 100644 --- a/tools/perf/util/sort.c +++ b/tools/perf/util/sort.c @@ -111,17 +111,20 @@ struct sort_entry sort_thread = { /* --sort comm */ +/* + * We can't use pointer comparison in functions below, + * because it gives different results based on pointer + * values, which could break some sorting assumptions. + */ static int64_t sort__comm_cmp(struct hist_entry *left, struct hist_entry *right) { - /* Compare the addr that should be unique among comm */ return strcmp(comm__str(right->comm), comm__str(left->comm)); } static int64_t sort__comm_collapse(struct hist_entry *left, struct hist_entry *right) { - /* Compare the addr that should be unique among comm */ return strcmp(comm__str(right->comm), comm__str(left->comm)); } -- 2.7.4