linux-kernel - Re: [patch 3/7] epoll keyed wakeups - introduce key-aware wakeup macros

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Date:	Sat, 31 Jan 2009 04:30:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch 3/7] epoll keyed wakeups - introduce key-aware wakeup
	macros


* Davide Libenzi <davidel@...ilserver.org> wrote:

> +#define wake_up(x)			kwake_up(x, NULL)
> +#define wake_up_nr(x, nr)		kwake_up_nr(x, nr, NULL)
> +#define wake_up_all(x)			kwake_up_all(x, NULL)
> +#define wake_up_locked(x)		kwake_up_locked(x, NULL)
> +
> +#define wake_up_interruptible(x)	kwake_up_interruptible(x, NULL)
> +#define wake_up_interruptible_nr(x, nr)	kwake_up_interruptible_nr(x, nr, NULL)
> +#define wake_up_interruptible_all(x)	kwake_up_interruptible_all(x, NULL)
> +#define wake_up_interruptible_sync(x)	kwake_up_interruptible_sync(x, NULL)

i like the patchset - nice work!

One minor worry i have: these wakeup calls are _very_ common in the 
kernel, and this patch adds an extra parameter to it that is unused (NULL) 
in 99% of the cases.

Would be nice to see the kernel image size increase due to this change 
(which gives a good measure about how much of an issue this is).

If it's of any worrying level, it might make sense to keep the original 
functions untouched, and introduce a second entry point that has one more 
parameter. Ok?

	Ingo
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