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

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Date:	Mon, 23 Oct 2006 04:11:45 -0700 (PDT)
From:	Giridhar Pemmasani <pgiri@...oo.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: __vmalloc with GFP_ATOMIC causes 'sleeping from invalid context'

--- Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> 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.

This has been discussed before:

http://marc.theaimsgroup.com/?l=linux-kernel&m=114831100404677&w=2

The problem is not with calling vmalloc in atomic context, but __vmalloc,
which can be. The proposed patch makes sure __vmalloc is not supposed to be
called in interrupt context.

Giri

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