linux-kernel - Re: __vmalloc with GFP_ATOMIC causes 'sleeping from invalid context'

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Message-Id: <1161599894.19388.11.camel@localhost.localdomain>
Date:	Mon, 23 Oct 2006 11:38:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Giridhar Pemmasani <pgiri@...oo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: __vmalloc with GFP_ATOMIC causes 'sleeping from invalid
	context'

Ar Llu, 2006-10-23 am 02:13 -0400, ysgrifennodd Giridhar Pemmasani:
> Synopsis of patch: If __vmalloc is called to allocate memory with
> GFP_ATOMIC in atomic context, the chain of calls results in
> __get_vm_area_node allocating memory for vm_struct with GFP_KERNEL

You are not allowed to call vmalloc in atomic context, especially in
interrupt paths. Vmalloc has to do TLB handling work and that can
involve cross calls and other stuff that isn't IRQ friendly on all
platforms.


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