linux-kernel - Re: [PATCH] SCSI, pmcraid: Fix kmalloc() argument order in pmcraid_chr

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Message-ID: <alpine.LNX.2.00.1110250110310.19795@swampdragon.chaosbits.net>
Date:	Tue, 25 Oct 2011 01:13:58 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
cc:	Dave Jones <davej@...hat.com>, Joe Perches <joe@...ches.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>
Subject: Re: [PATCH] SCSI, pmcraid: Fix kmalloc() argument order in
 pmcraid_chr_ioctl()

On Tue, 25 Oct 2011, richard -rw- weinberger wrote:

> On Tue, Oct 25, 2011 at 12:54 AM, Dave Jones <davej@...hat.com> wrote:
> > On Tue, Oct 25, 2011 at 12:50:08AM +0200, richard -rw- weinberger wrote:
> >
> >  > BTW: What about a checkpatch.pl rule to detect such a misuse of kmalloc()?
> >  > We could grep for "k[mzc]alloc(GFP_".
> >
> > Make sure to ignore bio_kmalloc (which has reverse argument order to kmalloc, ugh)
> >
> 
> Hmmm, maybe we should "fix" the argument order of bio_kmalloc().
> But as this function is exported we'd silently break some out-of-tree
> kernel modules....
> 
Or we could fix it noisily by renaming the function kmalloc_bio() and 
fixing the argument order. That will still break out-of-tree modules, but 
at least it won't break them silently...

Or we could introduce kmalloc_bio() with fixed argument order, fix all 
in-kernel users and mark bio_kmalloc() deprecated with a note that it'll 
go away by 3.6 or thereabouts...
I'd be happy to prepare a patch series doing that if it's wanted...?

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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