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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-11-12 15:09:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 12:09:22 +0900
commitec778edf97dcaa517e5b0eea6f1a9ba9d476e4a8 (patch)
treea9b092d8a94ada73d76da694b38d9af290177f5f /include/asm-generic
parentc962f7b95c98d2b42019cc9cb074886d177ee3a3 (diff)
bitops/find: clarify and extend documentation
Add return value documentation and clarify the units of the @size parameter. Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Cody P Schafer <cody@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/bitops/find.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/asm-generic/bitops/find.h b/include/asm-generic/bitops/find.h
index 71c778033f57..998d4d544f18 100644
--- a/include/asm-generic/bitops/find.h
+++ b/include/asm-generic/bitops/find.h
@@ -7,6 +7,9 @@
* @addr: The address to base the search on
* @offset: The bitnumber to start searching at
* @size: The bitmap size in bits
+ *
+ * Returns the bit number for the next set bit
+ * If no bits are set, returns @size.
*/
extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
size, unsigned long offset);
@@ -18,6 +21,9 @@ extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
* @addr: The address to base the search on
* @offset: The bitnumber to start searching at
* @size: The bitmap size in bits
+ *
+ * Returns the bit number of the next zero bit
+ * If no bits are zero, returns @size.
*/
extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
long size, unsigned long offset);
@@ -28,9 +34,10 @@ extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
/**
* find_first_bit - find the first set bit in a memory region
* @addr: The address to start the search at
- * @size: The maximum size to search
+ * @size: The maximum number of bits to search
*
* Returns the bit number of the first set bit.
+ * If no bits are set, returns @size.
*/
extern unsigned long find_first_bit(const unsigned long *addr,
unsigned long size);
@@ -38,9 +45,10 @@ extern unsigned long find_first_bit(const unsigned long *addr,
/**
* find_first_zero_bit - find the first cleared bit in a memory region
* @addr: The address to start the search at
- * @size: The maximum size to search
+ * @size: The maximum number of bits to search
*
* Returns the bit number of the first cleared bit.
+ * If no bits are zero, returns @size.
*/
extern unsigned long find_first_zero_bit(const unsigned long *addr,
unsigned long size);