linux-kernel - Re: [GIT PULL]

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Date:	Fri, 11 Feb 2011 16:33:59 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Ted Ts'o" <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL]

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])

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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