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From: Pavel Machek <pavel@ucw.cz>
To: Ingo Molnar <mingo@elte.hu>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	hpa@zytor.com, tglx@linutronix.de, andi@firstfloor.org,
	linux-kernel@vger.kernel.org,
	Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [patch 2/2] x86, fpu: lazy allocation of FPU area - v3
Date: Thu, 6 Mar 2008 21:24:47 +0100	[thread overview]
Message-ID: <20080306202446.GA4225@ucw.cz> (raw)
In-Reply-To: <20080306155141.GA23340@elte.hu>

On Thu 2008-03-06 16:51:41, Ingo Molnar wrote:
> 
> * Pavel Machek <pavel@ucw.cz> wrote:
> 
> > > > kmem_cache_alloc() can fail (return NULL) and not handling it is a 
> > > > bug.
> > > 
> > > oops. you are correct. Will send a sigsegv in the failure case then. 
> > > Thanks.
> > 
> > You are introducing possibility of hard to debug error, where previous 
> > code just worked... Does not look like good idea to me.
> 
> hm, how does it differ from any other allocation failure? We could fail 

Well, we should not be sending SIGSEGV...? SIGBUS would be cleaner, or
SIGKILL... what happens when userland tries to catch this one?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2008-03-06 20:25 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-03 23:02 [patch 1/2] x86, fpu: split FPU state from task struct " Suresh Siddha
2008-03-03 23:02 ` [patch 2/2] x86, fpu: lazy allocation of FPU area " Suresh Siddha
2008-03-04  1:20   ` Christoph Hellwig
2008-03-04  1:43     ` Suresh Siddha
2008-03-04 10:32       ` Ingo Molnar
2008-03-04 17:55         ` Suresh Siddha
2008-03-05 19:47           ` Pavel Machek
2008-03-06 15:51             ` Ingo Molnar
2008-03-06 19:10               ` Suresh Siddha
2008-03-06 20:24               ` Pavel Machek [this message]
2008-03-06 20:52                 ` Andi Kleen
2008-03-07 12:29                 ` H. Peter Anvin
2008-03-07 13:06                   ` Arjan van de Ven
2008-03-07 13:18                     ` Andi Kleen
2008-03-07 13:20                       ` Arjan van de Ven
2008-03-07 13:27                         ` Andi Kleen
2008-03-05 19:48   ` Pavel Machek
2008-03-06 19:26     ` Suresh Siddha
2008-03-06 21:21       ` Pavel Machek
2008-03-04  1:18 ` [patch 1/2] x86, fpu: split FPU state from task struct " Christoph Hellwig
2008-03-04  1:36   ` Suresh Siddha
2008-03-04  8:20     ` Ingo Molnar
2008-03-06 12:39     ` Christoph Hellwig
2008-03-04 10:28 ` Ingo Molnar
2008-03-04 17:59   ` Suresh Siddha
2008-03-04 20:53     ` Ingo Molnar

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