Re: [patch 3/7] epoll keyed wakeups - introduce key-aware wakeupmacros

From: Ingo Molnar
Date: Fri Jan 30 2009 - 22:31:16 EST

* Davide Libenzi <davidel@xxxxxxxxxxxxxxx> 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?

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