linux-kernel - Re: [PATCH] x86: Fix potential overflow in perfctr reservation

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Message-Id: <200704221414.32946.ak@suse.de>
Date:	Sun, 22 Apr 2007 14:14:32 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Fix potential overflow in perfctr reservation


> 
> The created a warning storm:

Hmm, yes good idea to fix that. Probably for x86-64 too.

> 
> I worry rather a lot about how well runtime tested this very late change
> was, 

I tested it with oprofile and checked the nmi watchdog.

> and whether it works correctly even with this fix applied.  Perhaps 
> we should jsut revert?

Then you get the memory corruption back.

The change really only enlarges the bitmaps a little anyways, it does not
change any algorithms.

-Andi
 
 

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