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authorKukkonen Mika <mika.kukkonen@nokia.com>2008-12-02 11:32:49 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-12-03 13:14:11 +0200
commit5dd7cbc083f3a91fa7454125fe992826701b67bc (patch)
treedb21827920cd91fd4da1115f1eea3bb99eca38b4 /fs/ubifs/key.h
parent553dea4dd531562688ba01c641c7f8fc7abaaf8c (diff)
downloadop-kernel-dev-5dd7cbc083f3a91fa7454125fe992826701b67bc.zip
op-kernel-dev-5dd7cbc083f3a91fa7454125fe992826701b67bc.tar.gz
UBIFS: avoid unnecessary checks
I have a habit of compiling kernel with EXTRA_CFLAGS="-Wextra -Wno-unused -Wno-sign-compare -Wno-missing-field-initializers" and so fs/ubifs/key.h give lots (~10) of these every time: CC fs/ubifs/tnc_misc.o In file included from fs/ubifs/ubifs.h:1725, from fs/ubifs/tnc_misc.c:30: fs/ubifs/key.h: In function 'key_r5_hash': fs/ubifs/key.h:64: warning: comparison of unsigned expression >= 0 is always true fs/ubifs/key.h: In function 'key_test_hash': fs/ubifs/key.h:81: warning: comparison of unsigned expression >= 0 is always true This patch fixes the warnings. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/key.h')
-rw-r--r--fs/ubifs/key.h32
1 files changed, 18 insertions, 14 deletions
diff --git a/fs/ubifs/key.h b/fs/ubifs/key.h
index 3f1f16b..efb3430 100644
--- a/fs/ubifs/key.h
+++ b/fs/ubifs/key.h
@@ -38,6 +38,22 @@
#define __UBIFS_KEY_H__
/**
+ * key_mask_hash - mask a valid hash value.
+ * @val: value to be masked
+ *
+ * We use hash values as offset in directories, so values %0 and %1 are
+ * reserved for "." and "..". %2 is reserved for "end of readdir" marker. This
+ * function makes sure the reserved values are not used.
+ */
+static inline uint32_t key_mask_hash(uint32_t hash)
+{
+ hash &= UBIFS_S_KEY_HASH_MASK;
+ if (unlikely(hash <= 2))
+ hash += 3;
+ return hash;
+}
+
+/**
* key_r5_hash - R5 hash function (borrowed from reiserfs).
* @s: direntry name
* @len: name length
@@ -54,16 +70,7 @@ static inline uint32_t key_r5_hash(const char *s, int len)
str++;
}
- a &= UBIFS_S_KEY_HASH_MASK;
-
- /*
- * We use hash values as offset in directories, so values %0 and %1 are
- * reserved for "." and "..". %2 is reserved for "end of readdir"
- * marker.
- */
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
@@ -77,10 +84,7 @@ static inline uint32_t key_test_hash(const char *str, int len)
len = min_t(uint32_t, len, 4);
memcpy(&a, str, len);
- a &= UBIFS_S_KEY_HASH_MASK;
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
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