Date: Tue, 4 Mar 2008 09:55:28 -0800
From: Suresh Siddha <suresh.b.siddha@intel.com>
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
Message-ID: <20080304175528.GD28006@linux-os.sc.intel.com>
References: <20080303230335.892214000@linux-os.sc.intel.com> <20080303230336.042604000@linux-os.sc.intel.com> <20080304012012.GB22431@infradead.org> <20080304014306.GC28006@linux-os.sc.intel.com> <20080304103220.GA17621@elte.hu>
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On Tue, Mar 04, 2008 at 11:32:20AM +0100, Ingo Molnar wrote:
> 
> * Suresh Siddha <suresh.b.siddha@intel.com> wrote:
> 
> > On Mon, Mar 03, 2008 at 08:20:12PM -0500, Christoph Hellwig wrote:
> > > On Mon, Mar 03, 2008 at 03:02:46PM -0800, Suresh Siddha wrote:
> > > > +	/*
> > > > +	 * Memory allocation at the first usage of the FPU and other state.
> > > > +	 */
> > > > +	if (!tsk->thread.xstate)
> > > > +		tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
> > >
> > >  Also don't we need some kind of error handling here?
> > 
> > Currently it uses SLAB_PANIC.
> 
> but SLAB_PANIC only covers kmem_cache_create() failures. 
> 
> 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.
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