linux-kernel - [tip:perf/core] perf top: Cleanup condition in perf_top__record_precise

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <tip-beefb8d0e556aaf3cb69168c5953e023ace6aa78@git.kernel.org>
Date:	Mon, 14 Dec 2015 00:37:33 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	namhyung@...nel.org, dsahern@...il.com, acme@...hat.com,
	a.p.zijlstra@...llo.nl, hpa@...or.com,
	linux-kernel@...r.kernel.org, jolsa@...hat.com, tglx@...utronix.de,
	mingo@...nel.org
Subject: [tip:perf/core] perf top:
  Cleanup condition in perf_top__record_precise_ip()

Commit-ID:  beefb8d0e556aaf3cb69168c5953e023ace6aa78
Gitweb:     http://git.kernel.org/tip/beefb8d0e556aaf3cb69168c5953e023ace6aa78
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Fri, 11 Dec 2015 11:56:56 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 11 Dec 2015 08:38:10 -0300

perf top: Cleanup condition in perf_top__record_precise_ip()

The 'he' cannot be NULL since it's caller hist_iter__top_callback() is
called only if iter->he is not NULL (see hist_entry_iter__add).  So
setting 'sym' before the condition to simplify the code.

Also make it clearer that the top->symbol_filter_entry check is only
meaningful on stdio mode (i.e. when use_browser is 0).

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1449802616-16170-4-git-send-email-namhyung@kernel.org
[ Complete the simplification replacing one more he->ms.sym with sym ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index f447e55..92fe963 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -175,15 +175,14 @@ static void perf_top__record_precise_ip(struct perf_top *top,
 					int counter, u64 ip)
 {
 	struct annotation *notes;
-	struct symbol *sym;
+	struct symbol *sym = he->ms.sym;
 	int err = 0;
 
-	if (he == NULL || he->ms.sym == NULL ||
-	    ((top->sym_filter_entry == NULL ||
-	      top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
+	if (sym == NULL || (use_browser == 0 &&
+			    (top->sym_filter_entry == NULL ||
+			     top->sym_filter_entry->ms.sym != sym)))
 		return;
 
-	sym = he->ms.sym;
 	notes = symbol__annotation(sym);
 
 	if (pthread_mutex_trylock(&notes->lock))
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/