All of lore.kernel.org
 help / color / mirror / Atom feed
From: Jiri Olsa <jolsa@kernel.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Andi Kleen <andi@firstfloor.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	hpa@zytor.com, Namhyung Kim <namhyung@kernel.org>,
	syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
	x86@kernel.org
Subject: [PATCH 3/3] perf: Remove superfluous allocation error check
Date: Sun, 15 Apr 2018 11:23:52 +0200	[thread overview]
Message-ID: <20180415092352.12403-3-jolsa@kernel.org> (raw)
In-Reply-To: <20180415092352.12403-1-jolsa@kernel.org>

If the get_callchain_buffers fails to allocate the buffer
it will decrease the nr_callchain_events right away.

There's no point of checking the allocation error for
nr_callchain_events > 1. Removing that check.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/events/callchain.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
index 73cc26e321de..c187aa3df3c8 100644
--- a/kernel/events/callchain.c
+++ b/kernel/events/callchain.c
@@ -131,14 +131,8 @@ int get_callchain_buffers(int event_max_stack)
 		goto exit;
 	}
 
-	if (count > 1) {
-		/* If the allocation failed, give up */
-		if (!callchain_cpus_entries)
-			err = -ENOMEM;
-		goto exit;
-	}
-
-	err = alloc_callchain_buffers();
+	if (count == 1)
+		err = alloc_callchain_buffers();
 exit:
 	if (err)
 		atomic_dec(&nr_callchain_events);
-- 
2.13.6

  parent reply	other threads:[~2018-04-15  9:24 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-15  9:23 [PATCH 1/3] perf: Return proper values for user stack errors Jiri Olsa
2018-04-15  9:23 ` [PATCH 2/3] perf: Fix sample_max_stack maximum check Jiri Olsa
2018-04-21  7:49   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2018-04-15  9:23 ` Jiri Olsa [this message]
2018-04-21  7:49   ` [tip:perf/urgent] perf: Remove superfluous allocation error check tip-bot for Jiri Olsa
2018-04-16 16:52 ` [PATCH 1/3] perf: Return proper values for user stack errors Arnaldo Carvalho de Melo
2018-04-16 16:54 ` Arnaldo Carvalho de Melo
2018-04-16 16:55   ` Arnaldo Carvalho de Melo
2018-04-21  7:48 ` [tip:perf/urgent] " tip-bot for Jiri Olsa

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180415092352.12403-3-jolsa@kernel.org \
    --to=jolsa@kernel.org \
    --cc=a.p.zijlstra@chello.nl \
    --cc=acme@kernel.org \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=andi@firstfloor.org \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=namhyung@kernel.org \
    --cc=syzkaller-bugs@googlegroups.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH 3/3] perf: Remove superfluous allocation error check' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.