linux-kernel - Re: [PATCH 1/3] x86, ras: Add new infrastructure for machine check fixup tables

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Date:	Tue, 10 Nov 2015 14:05:28 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH 1/3] x86, ras: Add new infrastructure for machine check
 fixup tables

On Tue, Nov 10, 2015 at 12:21:16PM +0100, Borislav Petkov wrote:
> > +# define _ASM_MCEXTABLE(from, to)				\
> 
> Maybe add an intermediary macro which abstracts the table name:
> 
> #define __ASM_EXTABLE(from, to, table)
> ...
> 
> and then do
> 
> #define _ASM_EXTABLE(from, to)		__ASM_EXTABLE(from, to, "__ex_table")
> #define _ASM_MCEXTABLE(from, to)	__ASM_EXTABLE(from, to, "__mcex_table")

That looks a bit nicer.
> 
> Yeah, all that duplication might raise some brows but I'd guess
> special-handling MCA in the normal exception paths might make the code
> a bit too ugly...

The 0-day robot berated me for bloating the i386-tinyconfig by 88 bytes.
I guess I can put the new functions inside #ifdef CONFIG_MEMORY_FAILURE
to save them from that. Enterprise kernels that turn this option on can
probably live with 88 bytes.

-Tony
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