Re: [PATCH] Remove softlockup from invalidate_mapping_pages.

["Steinar H. Gunderson" <sgunderson@bigfoot.com>]

On Thu, Apr 20, 2006 at 12:38:39AM -0700, Andrew Morton wrote:
> In practice, I think it's OK - there's no _reason_ why anyone would want to
> trash the ->index of a just-truncated page.  However I think it'd be saner
> to a) only look at ->index after we've tried to lock the page and b) make
> sure that ->index is really "to the right" of where we're currently at.
> 
> How's this look?
> 
> --- devel/mm/truncate.c~remove-softlockup-from-invalidate_mapping_pages	2006-04-20 00:20:49.000000000 -0700
> +++ devel-akpm/mm/truncate.c	2006-04-20 00:28:18.000000000 -0700

I tried this patch against 2.6.17-rc2 (I hoped that it might be fixing my
kswapd oopses too, as they seem related; see
http://lkml.org/lkml/2006/4/26/124 and followups), and it simply makes my
machine hang on bootup -- it seems to make modprobe hang forever on some lock
or something right after it loads raid6.ko (pulled in by evms_activate) in
initramfs. Without the patch, the machine boots just fine.

Since it's on serial console, I've got a SysRq+T log if it helps you.

/* Steinar */
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