linux-kernel - [PATCH 28/29] radix-tree: Create all_tag

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Date:   Wed, 16 Nov 2016 16:16:59 -0800
From:   Matthew Wilcox <mawilcox@...uxonhyperv.com>
To:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...ux.intel.com>, linux-mm@...ck.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 28/29] radix-tree: Create all_tag_set

From: Matthew Wilcox <willy@...ux.intel.com>

all_tag_set() sets every tag on a node.  This is useful for the IDR code
when we're creating new nodes which contain only free slots.

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
 lib/radix-tree.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index c8ef657..e063ca2 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -22,6 +22,8 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -33,7 +35,6 @@
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/string.h>
-#include <linux/bitops.h>
 #include <linux/rcupdate.h>
 #include <linux/preempt.h>		/* in_interrupt() */
 
@@ -184,6 +185,11 @@ static inline int any_tag_set(struct radix_tree_node *node, unsigned int tag)
 	return 0;
 }
 
+static inline void all_tag_set(struct radix_tree_node *node, unsigned int tag)
+{
+	bitmap_fill(node->tags[tag], RADIX_TREE_MAP_SIZE);
+}
+
 /**
  * radix_tree_find_next_bit - find the next set bit in a memory region
  *
-- 
2.10.2