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

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Date:	Fri, 8 Jan 2016 17:49:30 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Tony Luck <tony.luck@...el.com>
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 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?

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

--Andy