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From: Praveen Kumar <kpraveen.lkml@gmail.com>
To: xen-devel@lists.xen.org
Cc: sstabellini@kernel.org, wei.liu2@citrix.com,
	George.Dunlap@eu.citrix.com, andrew.cooper3@citrix.com,
	dario.faggioli@citrix.com, ian.jackson@eu.citrix.com,
	tim@xen.org, Praveen Kumar <kpraveen.lkml@gmail.com>,
	jbeulich@suse.com
Subject: [Resend][PATCH 01/17] rb_tree: reorganize code in rb_erase() for additional changes
Date: Thu,  1 Jun 2017 02:50:40 +0530	[thread overview]
Message-ID: <20170531212056.10583-2-kpraveen.lkml@gmail.com> (raw)
In-Reply-To: <20170531212056.10583-1-kpraveen.lkml@gmail.com>

First, move some code around in order to make the next change more obvious.

commit 16c047add3ceaf0ab882e3e094d1ec904d02312d from linux tree

Signed-off-by: Praveen Kumar <kpraveen.lkml@gmail.com>
---
 xen/common/rbtree.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/xen/common/rbtree.c b/xen/common/rbtree.c
index 3328960d56..9826909a2a 100644
--- a/xen/common/rbtree.c
+++ b/xen/common/rbtree.c
@@ -236,6 +236,16 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
         node = node->rb_right;
         while ((left = node->rb_left) != NULL)
             node = left;
+
+        if (rb_parent(old))
+        {
+            if (rb_parent(old)->rb_left == old)
+                rb_parent(old)->rb_left = node;
+            else
+                rb_parent(old)->rb_right = node;
+        } else
+            root->rb_node = node;
+
         child = node->rb_right;
         parent = rb_parent(node);
         color = rb_color(node);
@@ -252,15 +262,6 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
         node->rb_right = old->rb_right;
         node->rb_left = old->rb_left;
 
-        if (rb_parent(old))
-        {
-            if (rb_parent(old)->rb_left == old)
-                rb_parent(old)->rb_left = node;
-            else
-                rb_parent(old)->rb_right = node;
-        } else
-            root->rb_node = node;
-
         rb_set_parent(old->rb_left, node);
         if (old->rb_right)
             rb_set_parent(old->rb_right, node);
-- 
2.12.0


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  reply	other threads:[~2017-05-31 21:20 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-31 21:20 [Xen-devel[PATCH Resend v2] xen: common: rbtree: ported updates from linux tree Praveen Kumar
2017-05-31 21:20 ` Praveen Kumar [this message]
2017-05-31 22:40   ` [Resend][PATCH 01/17] rb_tree: reorganize code in rb_erase() for additional changes Dario Faggioli
2017-05-31 22:56     ` Andrew Cooper
2017-06-01  8:01       ` Dario Faggioli
2017-06-02 16:28         ` Praveen Kumar
2017-06-08 15:57   ` Jan Beulich
2017-05-31 21:20 ` [Resend][PATCH 02/17] rb_tree: make clear distinction between two different cases in rb_erase() Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 03/17] rb_tree: remove redundant if()-condition " Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 04/17] rbtree: empty nodes have no color Praveen Kumar
2017-06-12 16:42   ` Dario Faggioli
2017-06-13  8:21     ` Jan Beulich
2017-05-31 21:20 ` [Resend][PATCH 05/17] rbtree: move some implementation details from rbtree.h to rbtree.c Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 06/17] rbtree: break out of rb_insert_color loop after tree rotation Praveen Kumar
2017-06-12 16:41   ` Dario Faggioli
2017-05-31 21:20 ` [Resend][PATCH 07/17] rbtree: adjust root color in rb_insert_color() only when necessary Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 08/17] rbtree: low level optimizations in rb_insert_color() Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 09/17] rbtree: adjust node color in __rb_erase_color() only when necessary Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 10/17] rbtree: optimize case selection logic in __rb_erase_color() Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 11/17] rbtree: low level optimizations " Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 12/17] rbtree: optimize fetching of sibling node Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 13/17] rbtree: add __rb_change_child() helper function Praveen Kumar
2017-06-12 16:14   ` Dario Faggioli
2017-05-31 21:20 ` [Resend][PATCH 14/17] rbtree: place easiest case first in rb_erase() Praveen Kumar
2017-06-12 16:19   ` Dario Faggioli
2017-05-31 21:20 ` [Resend][PATCH 15/17] rbtree: handle 1-child recoloring in rb_erase() instead of rb_erase_color() Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 16/17] rbtree: low level optimizations in rb_erase() Praveen Kumar
2017-05-31 21:20 ` [Resend][PATCH 17/17] rbtree: add postorder iteration functions Praveen Kumar
2017-05-31 22:34 ` [Xen-devel[PATCH Resend v2] xen: common: rbtree: ported updates from linux tree Dario Faggioli
2017-06-01  7:26 ` Jan Beulich
2017-06-01  7:43   ` Dario Faggioli
2017-06-02 16:35     ` Praveen Kumar
2017-06-02 16:31   ` Praveen Kumar
2017-06-12 16:44 ` Dario Faggioli

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