linux-kernel - [PATCH] Fix mmap error for perf data file. Not all file systems, e.g. JFFS2, support MAP

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Date:	Fri,  4 Sep 2015 09:00:45 +0200
From:	Kenth Eriksson <kenth.eriksson@...nsmode.com>
To:	linux-kernel@...r.kernel.org, andi@...stfloor.org
Cc:	Kenth Eriksson <kenth.eriksson@...nsmode.com>
Subject: [PATCH] Fix mmap error for perf data file. Not all file systems, e.g. JFFS2, support MAP_SHARED.

Signed-off-by: Kenth Eriksson <kenth.eriksson@...nsmode.com>
---
 tools/perf/util/session.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 0c74012..c6617fe 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1338,11 +1338,10 @@ static int __perf_session__process_events(struct perf_session *session,
 	memset(mmaps, 0, sizeof(mmaps));
 
 	mmap_prot  = PROT_READ;
-	mmap_flags = MAP_SHARED;
+	mmap_flags = MAP_PRIVATE;
 
 	if (session->header.needs_swap) {
 		mmap_prot  |= PROT_WRITE;
-		mmap_flags = MAP_PRIVATE;
 	}
 remap:
 	buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, fd,
-- 
2.3.6

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