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author | Wolfram Strepp <wstrepp@gmx.de> | 2009-04-01 02:23:45 +0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 19:59:17 +0400 |
commit | 55a63998b8967615a15e2211ba0ff3a84a565824 (patch) | |
tree | a83905577b60496a3ea9174bf29596f927354746 /Documentation/sysrq.txt | |
parent | 53d6660836f233df66490707365ab177e5fb2bb4 (diff) | |
download | linux-55a63998b8967615a15e2211ba0ff3a84a565824.tar.xz |
lib/rbtree.c: optimize rb_erase()
Tfour 4 redundant if-conditions in function __rb_erase_color() in
lib/rbtree.c are removed.
In pseudo-source-code, the structure of the code is as follows:
if ((!A || B) && (!C || D)) {
.
.
.
} else {
if (!C || D) {//if this is true, it implies: (A == true) && (B == false)
if (A) {//hence this always evaluates to 'true'...
.
}
.
//at this point, C always becomes true, because of:
__rb_rotate_right/left();
//and:
other = parent->rb_right/left;
}
.
.
if (C) {//...and this too !
.
}
}
Signed-off-by: Wolfram Strepp <wstrepp@gmx.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <andrea@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/sysrq.txt')
0 files changed, 0 insertions, 0 deletions