[tip:perf/core] tools lib traceevent: Add '~' operation within arg_num_eval()

[tip-bot for Steven Rostedt]

Commit-ID:  9eb42dee2b11635174c74a7996934b6ca18f2179
Gitweb:     http://git.kernel.org/tip/9eb42dee2b11635174c74a7996934b6ca18f2179
Author:     Steven Rostedt <rost...@goodmis.org>
AuthorDate: Fri, 26 Feb 2016 18:13:28 -0500
Committer:  Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Thu, 10 Mar 2016 16:27:41 -0300

tools lib traceevent: Add '~' operation within arg_num_eval()

When evaluating values for print flags, if the value included a '~'
operator, the parsing would fail. This broke kmalloc's parsing of:

__print_flags(REC->gfp_flags, "|", {(unsigned
long)((((((( gfp_t)(0x400000u|0x2000000u)) | (( gfp_t)0x40u) |
(( gfp_t)0x80u) | (( gfp_t)0x20000u)) | (( gfp_t)0x02u)) |
(( gfp_t)0x08u)) | (( gfp_t)0x4000u) | (( gfp_t)0x10000u) |
(( gfp_t)0x1000u) | (( gfp_t)0x200u)) & ~(( gfp_t)0x2000000u))
                                        ^
                                        |
                                      here

Signed-off-by: Steven Rostedt <rost...@goodmis.org>
Reported-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Tested-by: David Ahern <dsah...@gmail.com>
Cc: Andi Kleen <a...@firstfloor.org>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Stephane Eranian <eran...@google.com>
Cc: Wang Nan <wangn...@huawei.com>
Link: http://lkml.kernel.org/r/20160226181328.22f47...@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/lib/traceevent/event-parse.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.c 
b/tools/lib/traceevent/event-parse.c
index 865dea5..190cc88 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -2398,6 +2398,12 @@ static int arg_num_eval(struct print_arg *arg, long long 
*val)
                                break;
                        *val = left + right;
                        break;
+               case '~':
+                       ret = arg_num_eval(arg->op.right, &right);
+                       if (!ret)
+                               break;
+                       *val = ~right;
+                       break;
                default:
                        do_warning("unknown op '%s'", arg->op.op);
                        ret = 0;