[dm-devel] [PATCH] SCHED: remove proliferation of wait_on_bit action functions.

David Howells dhowells at redhat.com
Tue May 13 16:08:46 UTC 2014

NeilBrown <neilb at suse.de> wrote:

> The current "wait_on_bit" interface requires an 'action' function
> to be provided which does the actual waiting.
> There are over 20 such functions, many of them identical.
> Most cases can be satisfied by one of just two functions, one
> which uses io_schedule() and one which just uses schedule().
> So:
>  Rename wait_on_bit and        wait_on_bit_lock to
>         wait_on_bit_action and wait_on_bit_lock_action
>  to make it explicit that they need an action function.
>  Introduce new wait_on_bit{,_lock} and wait_on_bit{,_lock}_io
>  which are *not* given an action function but implicitly use
>  a standard one.
>  The decision to error-out if a signal is pending is now made
>  based on the 'mode' argument rather than being encoded in the action
>  function.

Yay!  About time!  This is something I've wanted to do for ages, but never
quite got around to.

Acked-by: David Howells <dhowells at redhat.com>

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