linux-kernel - Re: Incompatibilities of kmem_cache

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Message-ID: <20070721062032.GA1814@linux-sh.org>
Date:	Sat, 21 Jul 2007 15:20:32 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	werner <werner@...aya.yi.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Incompatibilities of kmem_cache_create

On Sat, Jul 21, 2007 at 02:50:01AM -0300, werner wrote:
> Of the kernel 2.6.22-git15 of this night,  kmem_cache_create is not
> compatible and causes compiling errors of some fundamental programs.
> Before, this error didnt occur.
> 
Slab destructors haven't been supported in the kernel for ages, anything
that's relying on them to work out-of-tree is fundamentally broken.

> At least this happened on compiling the externel modules for btrfs and
> ndiskwrapper.    Principally the compatibility of the Kernel with older
> and new versions of the file systems have to be observed very good, for
> the reliability to can read dates.
> 
> Thus this should be checked, and corrected
> 
Indeed it should. You can correct this by removing the extraneous NULL
parameter for the slab dtor from the kmem_cache_create() callsite in the
out-of-tree code. All of the in-tree users were already converted.
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