linux-kernel - Re: [PATCH v8 3/7] mm, devm_memremap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b8ae55a4-7c1a-cc35-beea-badf35a69b06@deltatee.com>
Date:   Fri, 30 Nov 2018 15:19:03 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        stable <stable@...r.kernel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v8 3/7] mm, devm_memremap_pages: Fix shutdown handling

Hey,

On 2018-11-29 11:51 a.m., Dan Williams wrote:
> Got it, let me see how bad moving arch_remove_memory() turns out,
> sounds like a decent approach to coordinate multiple users of a single
> ref.

I've put together a patch set[1] that fixes all the users of
devm_memremap_pages() without moving arch_remove_memory(). It's pretty
clean except for the p2pdma case which is fairly tricky but I don't
think there's an easy way around that.

If you come up with a better solution that's great, otherwise let me
know and I'll do some clean up and more testing and send this set to the
lists. Though, we might need to wait for your patch to land before we
can properly send the fix to it (the first patch in my series)...

Logan

[1] https://github.com/sbates130272/linux-p2pmem/ memremap_fix