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authorMichel Lespinasse <walken@google.com>2012-10-08 16:30:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:35 +0900
commit6280d2356fd8ad0936a63c10dc1e6accf48d0c61 (patch)
tree867b959cc5441f5af443965acc60d2e78dc7fec0 /arch/m68k/math-emu
parente125d1471a4f8f1bf7ea9a83deb8d23cb40bd712 (diff)
rbtree: low level optimizations in __rb_erase_color()
In __rb_erase_color(), we often already have pointers to the nodes being rotated and/or know what their colors must be, so we can generate more efficient code than the generic __rb_rotate_left() and __rb_rotate_right() functions. Also when the current node is red or when flipping the sibling's color, the parent is already known so we can use the more efficient rb_set_parent_color() function to set the desired color. Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: David Woodhouse <David.Woodhouse@intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Daniel Santos <daniel.santos@pobox.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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