linux-ext4 - Re: [GIT PULL]

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Date:	Fri, 11 Feb 2011 19:41:41 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Ted Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL]

On 2/11/11 6:33 PM, Linus Torvalds wrote:
> On Fri, Feb 11, 2011 at 5:40 AM, Ted Ts'o <tytso@....edu> wrote:
>>
>> Please pull from:
>>
>>  git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git for_linus
>>
>> to get regression and bug fixes for 2.6.38.
>>
>> Eric Sandeen (3):
>>      ext4: serialize unaligned asynchronous DIO
> 
> This is a completely disgusting patch, and it causes warnings like this:

>  fs/ext4/file.c: In function ‘ext4_aiodio_wait’:
>  fs/ext4/file.c:60:44: warning: cast from pointer to integer of different size
> 
> because that disgusting patch does things like
> 
>   #define ext4_aio_mutex(v)  (&ext4__aio_mutex[((unsigned)v) % EXT4_WQ_HASH_SZ])

Well crap, the patch I sent Ted did not cause warnings.
OTOH, I eyeballed his changes to my patch and said OK.  Didn't test-build it though.
Sorry about that.

Will see what's going on here...

-Eric

> which is just terminally broken.
> 
> It's terminally broken for multiple reasons, too. It's not just "oh, a
> warning". It's a case of "oh, THAT CODE IS UTTER CRAP". The warning
> was just the lucky reason I noticed the totally unacceptable code.
> 
> Dammit, don't send sh*t to me this late in the release cycle. This
> clearly went through _zero_ quality control.
> 
>                    Linus
> 
> PS. If people don't understand why that code is utter crap, let me
> give you a hint: macro argument expansion vs operator precedence.
> 
> PPS. And btw, the warning is unacceptable too. Cast the thing to
> "unsigned long" (or uintptr_t, but quite frankly, in the kernel I'd
> suggest "unsigned long" rather than the more obscure standard types)
> after you've fixed the macro argument problem.
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