linux-kernel - Re: [PATCH 1/2] mm/vmalloc: Export purge_vmap_area

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Message-ID: <20100325052814.GA7493@laptop.nomadix.com>
Date:	Thu, 25 Mar 2010 16:28:14 +1100
From:	Nick Piggin <npiggin@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nathan Fontenot <nfont@...tin.ibm.com>
Subject: Re: [PATCH 1/2] mm/vmalloc: Export purge_vmap_area_lazy()

On Wed, Mar 24, 2010 at 06:56:31PM +1100, Benjamin Herrenschmidt wrote:
> Some powerpc code needs to ensure that all previous iounmap/vunmap has
> really been flushed out of the MMU hash table. Without that, various
> hotplug operations may fail when trying to return those pieces to
> the hypervisor due to existing active mappings.
> 
> This exports purge_vmap_area_lazy() to allow the powerpc code to perform
> that purge when unplugging devices.

You want vm_unmap_aliases(), which also flushes entries in the
per-cpu vmap allocator (and is already exported for other code
that has similar problems).

Thanks,
Nick

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