linux-kernel - [tip:perf/urgent] perf evlist: Remove stale mmap read for backward

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Date:   Fri, 16 Feb 2018 01:34:26 -0800
From:   tip-bot for Kan Liang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     kan.liang@...el.com, namhyung@...nel.org, hpa@...or.com,
        peterz@...radead.org, mingo@...nel.org, yao.jin@...ux.intel.com,
        ak@...ux.intel.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, jolsa@...nel.org, wangnan0@...wei.com,
        acme@...hat.com
Subject: [tip:perf/urgent] perf evlist: Remove stale mmap read for backward

Commit-ID:  6888ff66c44ffa3077ed69e978902d0ff4b84ae1
Gitweb:     https://git.kernel.org/tip/6888ff66c44ffa3077ed69e978902d0ff4b84ae1
Author:     Kan Liang <kan.liang@...el.com>
AuthorDate: Thu, 18 Jan 2018 13:26:16 -0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 15 Feb 2018 09:50:53 -0300

perf evlist: Remove stale mmap read for backward

perf_evlist__mmap_read_catchup() and perf_evlist__mmap_read_backward()
are only for overwrite mode.

But they read the evlist->mmap buffer which is for non-overwrite mode.

It did not bring any serious problem yet, because there is no one use
it.

Remove the unused interfaces.

Signed-off-by: Kan Liang <kan.liang@...el.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Acked-by: Wang Nan <wangnan0@...wei.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1516310792-208685-2-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 17 -----------------
 tools/perf/util/evlist.h |  4 ----
 2 files changed, 21 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index ac35cd2..e5fc14e 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -715,28 +715,11 @@ union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int
 	return perf_mmap__read_forward(md);
 }
 
-union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
-{
-	struct perf_mmap *md = &evlist->mmap[idx];
-
-	/*
-	 * No need to check messup for backward ring buffer:
-	 * We can always read arbitrary long data from a backward
-	 * ring buffer unless we forget to pause it before reading.
-	 */
-	return perf_mmap__read_backward(md);
-}
-
 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 {
 	return perf_evlist__mmap_read_forward(evlist, idx);
 }
 
-void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
-{
-	perf_mmap__read_catchup(&evlist->mmap[idx]);
-}
-
 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
 {
 	perf_mmap__consume(&evlist->mmap[idx], false);
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 75f8e0a..336b838 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -133,10 +133,6 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx);
 
 union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist,
 						 int idx);
-union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
-						  int idx);
-void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
-
 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
 
 int perf_evlist__open(struct perf_evlist *evlist);