lib: Add generic binary search function to the kernel.
authorTim Abbott <tabbott@ksplice.com>
Thu, 14 Apr 2011 18:00:19 +0000 (20:00 +0200)
committerRusty Russell <rusty@rustcorp.com.au>
Thu, 19 May 2011 07:25:27 +0000 (16:25 +0930)
commit1a94dc35bc5c166d89913dc01a49d27a3c21a455
tree575196f1d0b9528b7d63b9bff692dd81e1aeac0f
parentf02e8a6596b7dc9b2171f7ff5654039ef0950cdc
lib: Add generic binary search function to the kernel.

There a large number hand-coded binary searches in the kernel (run
"git grep search | grep binary" to find many of them).  Since in my
experience, hand-coding binary searches can be error-prone, it seems
worth cleaning this up by providing a generic binary search function.

This generic binary search implementation comes from Ksplice.  It has
the same basic API as the C library bsearch() function.  Ksplice uses
it in half a dozen places with 4 different comparison functions, and I
think our code is substantially cleaner because of this.

Signed-off-by: Tim Abbott <tabbott@ksplice.com>
Extra-bikeshedding-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Extra-bikeshedding-by: AndrĂ© Goddard Rosa <andre.goddard@gmail.com>
Extra-bikeshedding-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Alessio Igor Bogani <abogani@kernel.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
include/linux/bsearch.h [new file with mode: 0644]
lib/Makefile
lib/bsearch.c [new file with mode: 0644]