Michel Lespinasse 4c199a93a2 rbtree: empty nodes have no color ... Empty nodes have no color. We can make use of this property to simplify the code emitted by the RB_EMPTY_NODE and RB_CLEAR_NODE macros. Also, we can get rid of the rb_init_node function which had been introduced by commit 88d19cf379 ("timers: Add rb_init_node() to allow for stack allocated rb nodes") to avoid some issue with the empty node's color not being initialized. I'm not sure what the RB_EMPTY_NODE checks in rb_prev() / rb_next() are doing there, though. axboe introduced them in commit 10fd48f237 ("rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev"). The way I see it, the 'empty node' abstraction is only used by rbtree users to flag nodes that they haven't inserted in any rbtree, so asking the predecessor or successor of such nodes doesn't make any sense. One final rb_init_node() caller was recently added in sysctl code to implement faster sysctl name lookups. This code doesn't make use of RB_EMPTY_NODE at all, and from what I could see it only called rb_init_node() under the mistaken assumption that such initialization was required before node insertion. [sfr@canb.auug.org.au: fix net/ceph/osd_client.c build] 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> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-10-09 16:22:32 +09:00
..
array.c
base.c	oom: remove deprecated oom_adj	2012-10-09 16:22:24 +09:00
cmdline.c
consoles.c
cpuinfo.c
devices.c
fd.c	don't leak O_CLOEXEC into ->f_flags	2012-09-26 21:10:01 -04:00
fd.h	procfs: Move /proc/pid/fd[info] handling code to fd.[ch]	2012-09-26 21:10:01 -04:00
generic.c	proc: use kzalloc instead of kmalloc and memset	2012-10-06 03:05:18 +09:00
inode.c	proc: no need to initialize proc_inode->fd in proc_get_inode()	2012-10-06 03:05:18 +09:00
internal.h	coredump: use SUID_DUMPABLE_ENABLED rather than hardcoded 1	2012-10-06 03:05:16 +09:00
interrupts.c
Kconfig
kcore.c
kmsg.c
loadavg.c
Makefile	procfs: Move /proc/pid/fd[info] handling code to fd.[ch]	2012-09-26 21:10:01 -04:00
meminfo.c
mmu.c
namespaces.c
nommu.c
page.c
proc_devtree.c
proc_net.c
proc_sysctl.c	rbtree: empty nodes have no color	2012-10-09 16:22:32 +09:00
proc_tty.c
root.c	fs/proc/root.c: use NULL instead of 0 for pointer	2012-10-06 03:05:19 +09:00
softirqs.c
stat.c
task_mmu.c	mm: kill vma flag VM_RESERVED and mm->reserved_vm counter	2012-10-09 16:22:19 +09:00
task_nommu.c
uptime.c
version.c
vmcore.c