From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: David Rientjes <rientjes@google.com>, Ingo Molnar <mingo@elte.hu>,
Jack Steiner <steiner@sgi.com>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Christoph Lameter <cl@linux-foundation.org>
Subject: Re: introducing __GFP_PANIC
Date: Mon, 04 May 2009 12:56:09 +0300 [thread overview]
Message-ID: <1241430969.21088.20.camel@penberg-laptop> (raw)
In-Reply-To: <20090504084916.GB4173@lenovo>
On Mon, 2009-05-04 at 12:49 +0400, Cyrill Gorcunov wrote:
> | __GFP_PANIC is an annotation saying that it's okay for a particular
> | call-site not to check for NULL because we never expect to run out of
> | memory at that point. But we don't really need to panic() for all the
> | possible *errors*, just for the out-of-memory case.
> |
> | Pekka
> |
>
> Which means, __GFP_PANIC will not grant the guarantee to a caller
> that he will not get NULL deref even with __GFP_PANIC specified?
Yes, __GFP_PANIC will guarantee that you never return NULL for
_out-of-memory_ but makes no guarantees what happens if you pass bogus
size or order.
next prev parent reply other threads:[~2009-05-04 9:56 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-01 19:56 [PATCH -tip] x86: uv - prevent NULL dereference in uv_system_init Cyrill Gorcunov
2009-05-01 20:03 ` Ingo Molnar
2009-05-01 20:09 ` Cyrill Gorcunov
2009-05-01 20:25 ` Cyrill Gorcunov
2009-05-01 20:31 ` Jack Steiner
2009-05-03 8:48 ` Ingo Molnar
2009-05-03 9:01 ` Cyrill Gorcunov
2009-05-03 9:09 ` David Rientjes
2009-05-03 9:38 ` Cyrill Gorcunov
2009-05-03 9:53 ` David Rientjes
2009-05-03 9:59 ` Pekka Enberg
2009-05-03 12:12 ` Cyrill Gorcunov
2009-05-03 12:27 ` Pekka Enberg
2009-05-03 14:38 ` Cyrill Gorcunov
2009-05-03 16:54 ` Pekka Enberg
2009-05-03 17:23 ` introducing __GFP_PANIC Cyrill Gorcunov
2009-05-03 17:38 ` Pekka Enberg
2009-05-03 17:49 ` Cyrill Gorcunov
2009-05-03 20:45 ` Cyrill Gorcunov
2009-05-03 20:58 ` David Rientjes
2009-05-04 8:14 ` Cyrill Gorcunov
2009-05-04 8:32 ` Pekka Enberg
2009-05-04 8:49 ` Cyrill Gorcunov
2009-05-04 9:56 ` Pekka Enberg [this message]
2009-05-04 9:08 ` Cyrill Gorcunov
2009-05-04 9:57 ` Pekka Enberg
2009-05-04 10:01 ` Cyrill Gorcunov
2009-05-04 10:11 ` Cyrill Gorcunov
2009-05-04 10:33 ` Pekka Enberg
2009-05-04 10:52 ` Cyrill Gorcunov
2009-05-04 10:56 ` David Rientjes
2009-05-04 11:10 ` Cyrill Gorcunov
2009-05-04 16:58 ` [tip:x86/apic] x86: uv - prevent NULL dereference in uv_system_init() tip-bot for Cyrill Gorcunov
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