linux-kernel - Re: [PATCH 07/19] ptrace: use bit_waitqueue for TRAPPING instead of wait

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Date:	Tue, 24 May 2011 12:03:16 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	oleg@...hat.com, vda.linux@...glemail.com,
	jan.kratochvil@...hat.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com,
	pedro@...esourcery.com
Subject: Re: [PATCH 07/19] ptrace: use bit_waitqueue for TRAPPING instead of wait_chldexit

On Tue, May 24, 2011 at 11:37 AM, Tejun Heo <tj@...nel.org> wrote:
>
> +               wake_up_bit(&task->jobctl, ilog2(JOBCTL_TRAPPING));

Why do people do this *SHIT*?

Stop it.

If you need the bit number, then define the damn thing in terms of bit
numbers! Do

  #define JOBCTL_TRAPPING_BIT xxx
  #define JOBCTL_TRAPPING (1u << JOBCTL_TRAPPING_BIT)

but never ever do that stupid ilog2() thing. Every time I see it I go
"ok, that's just total crap".

Don't do it.

                      Linus
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