From: Christoph Lameter <cl@linux.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Kosina <jkosina@suse.cz>, Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Dan Carpenter <dan.carpenter@oracle.com>,
Theodore Ts'o <tytso@mit.edu>
Subject: Re: [PATCH] mm/sl[aou]b: make kfree() aware of error pointers
Date: Wed, 10 Sep 2014 08:59:33 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.11.1409100858470.23359@gentwo.org> (raw)
In-Reply-To: <20140909162114.44b3e98cf925f125e84a8a06@linux-foundation.org>
On Tue, 9 Sep 2014, Andrew Morton wrote:
> >
> > - if (unlikely(ZERO_OR_NULL_PTR(objp)))
> > + if (unlikely(ZERO_OR_NULL_PTR(objp) || IS_ERR(objp)))
> > return;
>
> kfree() is quite a hot path to which this will add overhead. And we
> have (as far as we know) no code which will actually use this at
> present.
We could come up with a macro that does both. Basically if objp < 4086 or
so (signed comparison) then just return.
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prev parent reply other threads:[~2014-09-10 13:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 21:25 Jiri Kosina
2014-09-09 23:21 ` Andrew Morton
2014-09-10 5:05 ` Jiri Kosina
2014-09-10 5:11 ` Andrew Morton
2014-09-10 6:36 ` Dan Carpenter
2014-09-10 13:56 ` Theodore Ts'o
2014-09-10 14:27 ` Dave Jones
2014-09-10 14:07 ` Theodore Ts'o
2014-09-10 14:24 ` Jiri Kosina
2014-09-10 14:33 ` Andrey Ryabinin
2014-09-10 14:42 ` Jiri Kosina
2014-09-10 15:43 ` Christoph Lameter
2014-09-10 14:26 ` Jiri Kosina
2014-09-10 15:21 ` Dan Carpenter
2014-09-10 15:28 ` Jiri Kosina
2014-09-10 15:53 ` Dan Carpenter
2014-09-10 19:40 ` Theodore Ts'o
2014-09-11 14:14 ` Rasmus Villemoes
2014-09-10 14:22 ` Christoph Lameter
2014-09-10 5:15 ` Valdis.Kletnieks
2014-09-10 6:51 ` Dan Carpenter
2014-09-10 13:59 ` Christoph Lameter [this message]
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