The following patch series consolidates the various instances of waitqueue
hashing to use a uniform structure and share the per-zone hashtable among all
waitqueue hashers.  This is expected to increase the number of hashtable
buckets available for waiting on bh's and inodes and eliminate statically
allocated kernel data structures for greater node locality and reduced kernel
image size.  Some attempt was made to look similar to Oleg Nesterov's
suggested API in order to provide some kind of credit for independent
invention of something very similar (the original versions of these patches
predated my public postings on the subject of filtered waitqueues).

These patches have the further benefit and intention of enabling aio to use
filtered wakeups by standardizing the data structure passed to wake functions
so that embedded waitqueue elements in aio structures may be succesfully
passed to the filtered wakeup wake functions, though this patch series doesn't
implement that particular functionality.

Successfully stress-tested on x86-64, and ia64 in recent prior versions.


This patch:

Move waitqueue -related functions not needing static functions in sched.c
to kernel/wait.c
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>