linux-kernel - Re: [PATCHV3 3/3] x86, ras: Add mcsafe_memcpy() function to recover from machine checks

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Date:	Wed, 23 Dec 2015 12:46:20 -0800
From:	Tony Luck <tony.luck@...il.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>, Elliott@...tnic,
	Robert <elliott@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86-ML <x86@...nel.org>
Subject: Re: [PATCHV3 3/3] x86, ras: Add mcsafe_memcpy() function to recover
 from machine checks

> I know, memcpy returns the ptr to @dest like a parrot

Maybe I need to change the name to remove the
"memcpy" substring to avoid this confusion. How
about "mcsafe_copy()"? Perhaps with a "__" prefix
to point out it is a building block that will get various
wrappers around it??

Dan wants a copy_from_nvdimm() that either completes
the copy, or indicates where a machine check occurred.

I'm going to want a copy_from_user() that has two fault
options (user gave a bad address -> -EFAULT, or the
source address had an uncorrected error -> SIGBUS).

-Tony
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