From: Nick Piggin <npiggin@suse.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] mm/vmalloc: Export purge_vmap_area_lazy()
Date: Thu, 25 Mar 2010 16:28:14 +1100 [thread overview]
Message-ID: <20100325052814.GA7493@laptop.nomadix.com> (raw)
In-Reply-To: <1269417391.8599.188.camel@pasglop>
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
next prev parent reply other threads:[~2010-03-25 5:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-24 7:56 [PATCH 1/2] mm/vmalloc: Export purge_vmap_area_lazy() Benjamin Herrenschmidt
2010-03-25 5:28 ` Nick Piggin [this message]
2010-03-25 8:25 ` Benjamin Herrenschmidt
2010-03-25 8:39 ` MJ embd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100325052814.GA7493@laptop.nomadix.com \
--to=npiggin@suse.de \
--cc=benh@kernel.crashing.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).