From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Kumar Gala <kumar.gala@freescale.com>
Cc: linux-kernel Kernel <linux-kernel@vger.kernel.org>
Subject: Re: questions on how x86 uses IPI for tlb invalidates
Date: Wed, 19 Nov 2008 03:20:25 +1100 [thread overview]
Message-ID: <200811190320.25720.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <07E85AE1-3F9B-45A0-BBFF-22B8DAD54158@freescale.com>
On Wednesday 19 November 2008 03:06, Kumar Gala wrote:
> On Nov 18, 2008, at 10:03 AM, Nick Piggin wrote:
> > You can't do the broadcast TLB invalidates in kunmap_atomic.
> > All that's needed in that case is to just invalidate the local
> > CPU.
>
> Agreed, I was planning on fixing that. I guess the high level
> question is if a broadcast invalidate can occur in soft or hard irq
> context.
x86 does them for unmapping KVA (except kunmap_atomic), and
unmapping UVA. Unmapping KVA (eg. kunmap, vunmap) is not allowed
in irq context.
So long as you fix kunmap_atomic, you shouldn't have a problems.
prev parent reply other threads:[~2008-11-18 16:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-18 15:20 Kumar Gala
2008-11-18 15:44 ` Nick Piggin
2008-11-18 15:51 ` Kumar Gala
2008-11-18 16:03 ` Nick Piggin
2008-11-18 16:06 ` Kumar Gala
2008-11-18 16:20 ` Nick Piggin [this message]
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