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Date: Wed, 5 Mar 2008 20:47:06 +0100 From: Pavel Machek <pavel@....cz> To: Suresh Siddha <suresh.b.siddha@...el.com> Cc: Ingo Molnar <mingo@...e.hu>, Christoph Hellwig <hch@...radead.org>, hpa@...or.com, tglx@...utronix.de, andi@...stfloor.org, linux-kernel@...r.kernel.org, Arjan van de Ven <arjan@...ux.intel.com> Subject: Re: [patch 2/2] x86, fpu: lazy allocation of FPU area - v3 On Tue 2008-03-04 09:55:28, Suresh Siddha wrote: > On Tue, Mar 04, 2008 at 11:32:20AM +0100, Ingo Molnar wrote: > > > > * Suresh Siddha <suresh.b.siddha@...el.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. You are introducing possibility of hard to debug error, where previous code just worked... Does not look like good idea to me. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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