linux-kernel - Re: percpu related boot crash on x86

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Date:	Thu, 20 Jan 2011 11:47:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: percpu related boot crash on x86

On Thu, 2011-01-20 at 10:31 +0200, Pekka Enberg wrote:
>    if (!irqs_disabled())
> 
> guard around the debugging code to make vfree() always work with IRQs 
> disabled. 

That won't be sufficient, __purge_vmap_area_lazy() needs to call
flush_tlb_kernel_range() occasionally.

There really is a good reason vmalloc()/vfree() don't work with
interrupts disabled.


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