[tip:perf/core] perf trace beauty mmap: Ignore 'fd' and 'offset' args for MAP_ANONYMOUS

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  d57da8c9a5e11e7786931cfa1fd744969f530b2e
Gitweb:     http://git.kernel.org/tip/d57da8c9a5e11e7786931cfa1fd744969f530b2e
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Wed, 19 Jul 2017 12:16:15 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 20 Jul 2017 09:55:51 -0300

perf trace beauty mmap: Ignore 'fd' and 'offset' args for MAP_ANONYMOUS

Just suppress them, not used by the kernel.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-atpt07y2x9a8ttlwja94ow3j@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/trace/beauty/mmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/trace/beauty/mmap.c b/tools/perf/trace/beauty/mmap.c
index af1cfde..754558f 100644
--- a/tools/perf/trace/beauty/mmap.c
+++ b/tools/perf/trace/beauty/mmap.c
@@ -34,6 +34,9 @@ static size_t syscall_arg__scnprintf_mmap_flags(char *bf, size_t size,
 {
 	int printed = 0, flags = arg->val;
 
+	if (flags & MAP_ANONYMOUS)
+		arg->mask |= (1 << 4) | (1 << 5); /* Mask 4th ('fd') and 5th ('offset') args, ignored */
+
 #define	P_MMAP_FLAG(n) \
 	if (flags & MAP_##n) { \
 		printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \