linux-kernel - Re: use memcpy_mcsafe() for copy_to_iter() (was: Re: [PATCH v3 0/9] Series short description)

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Date:   Mon, 14 May 2018 10:53:51 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Snitzer <snitzer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: use memcpy_mcsafe() for copy_to_iter() (was: Re: [PATCH v3 0/9] Series short description)



> On May 14, 2018, at 8:52 AM, Dan Williams <dan.j.williams@...el.com> wrote:
> 

> 
> I think "happy" is a strong word when it comes to x86 machine check
> handling. My interpretation is that he and Andy acquiesced that this
> is about the best we can do with dax+mce as things stand today.


Agreed. I think it’s plausible that we could do slightly better for MCEs related to bad memory accessed through the direct map, but the code would be complicated and miserable to test, and it’s not even clear that it would materially decrease the chance that we survive as compared to these patches.