linux-kernel - [PATCH 6/9] XArray: internal node is a xa_node when it is bigger than XA_ZERO

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Message-Id: <20200330123643.17120-7-richard.weiyang@gmail.com>
Date:   Mon, 30 Mar 2020 12:36:40 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     willy@...radead.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 6/9] XArray: internal node is a xa_node when it is bigger than XA_ZERO_ENTRY

As the comment mentioned, we reserved several ranges of internal node
for tree maintenance, 0-62, 256, 257. This means a node bigger than
XA_ZERO_ENTRY is a normal node.

The checked on XA_ZERO_ENTRY seems to be more meaningful.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 include/linux/xarray.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index a491653d8882..e9d07483af64 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -1221,7 +1221,7 @@ static inline struct xa_node *xa_to_node(const void *entry)
 /* Private */
 static inline bool xa_is_node(const void *entry)
 {
-	return xa_is_internal(entry) && (unsigned long)entry > 4096;
+	return xa_is_internal(entry) && entry > XA_ZERO_ENTRY;
 }
 
 /* Private */
-- 
2.23.0