linux-kernel - Re: [PATCHV5 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks

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Message-ID: <6c0b3214-f120-47ee-b7fe-677b4f27f039@email.android.com>
Date:	Sun, 27 Dec 2015 14:17:37 +0100
From:	Boris Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Tony Luck <tony.luck@...il.com>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>,
	"elliott@....com" <elliott@....com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHV5 3/3] x86, ras: Add __mcsafe_copy() function to recover from machine checks

Andy Lutomirski <luto@...capital.net> wrote:
>You certainly can, but it doesn't scale well to multiple users of
>similar mechanisms.  It also prevents you from using the same
>mechanism in anything that could be inlined, which is IMO kind of
>unfortunate.

Well, but the bit 31 game doesn't make it any better than the bit 63 fun IMO. Should the exception table entry maybe grow a u32 flags instead? 



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