linux-kernel - Re: [PATCH 3/3] x86, extable: Handle early exceptions

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Date:	Thu, 19 Apr 2012 16:10:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Tony Luck <tony.luck@...il.com>,
	David Daney <ddaney.cavm@...il.com>,
	Borislav Petkov <bp@...64.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney@...iumnetworks.com>
Subject: Re: [PATCH 3/3] x86, extable: Handle early exceptions

On 04/19/2012 03:58 PM, Linus Torvalds wrote:
> 
> In fact, doing an "objdump" on the few modules I have, I didn't find a
> *single* exception table entry. Maybe I did something wrong? Isn't it
> the __ex_table in modules too?
> 

It is, but I suspect a lot of modules don't end up with any exception
table entries, as the common forms of user space access are out of line.

I suspect that just finding the module we're in or not in before
searching its ex_table is probably good enough, but a global hash would
be better.  That being said, some distros are complaining about the
amount of time it takes to load modules on boot...

	-hpa

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