linux-kernel - Re: [PATCH v8 3/3] x86, mce: Add __mcsafe

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Message-ID: <CA+8MBbL5Cwxjr_vtfE5n+XHPknFK4QMC3QNwaif5RvWo-eZATQ@mail.gmail.com>
Date:	Sat, 9 Jan 2016 09:48:02 -0800
From:	Tony Luck <tony.luck@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-nvdimm <linux-nvdimm@...1.01.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert <elliott@....com>, Ingo Molnar <mingo@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v8 3/3] x86, mce: Add __mcsafe_copy()

On Fri, Jan 8, 2016 at 5:49 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Jan 8, 2016 4:19 PM, "Tony Luck" <tony.luck@...el.com> wrote:
>>
>> Make use of the EXTABLE_FAULT exception table entries. This routine
>> returns a structure to indicate the result of the copy:
>
> Perhaps this is silly, but could we make this feature depend on ERMS
> and thus make the code a lot simpler?

ERMS?

> Also, what's the sfence for?  You don't seem to be using any
> non-temporal operations.

Ah - left over from the original function that this
was cloned from (which did use non-temporal
operations).  Will delete.

-Tony