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authorRusty Russell <rusty@rustcorp.com.au>2009-01-03 16:21:08 +1030
committerRusty Russell <rusty@rustcorp.com.au>2009-01-03 16:21:08 +1030
commit5ece5c5192d065c229da01e7b347c1d3877b59fa (patch)
tree755642823b24f869c4c67c7712f6fa45c4f87e9d
parent5c134dad43443aa9c9606eaf47c378a6b9c5c597 (diff)
downloadlinux-stericsson-5ece5c5192d065c229da01e7b347c1d3877b59fa.tar.gz
xtensa: define __fls
Like fls, but can't be handed 0 and returns the bit number. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
-rw-r--r--include/asm-xtensa/bitops.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-xtensa/bitops.h b/include/asm-xtensa/bitops.h
index 23261e8f2e5a..6c3930397bd3 100644
--- a/include/asm-xtensa/bitops.h
+++ b/include/asm-xtensa/bitops.h
@@ -82,6 +82,16 @@ static inline int fls (unsigned int x)
return 32 - __cntlz(x);
}
+/**
+ * __fls - find last (most-significant) set bit in a long word
+ * @word: the word to search
+ *
+ * Undefined if no set bit exists, so code should check against 0 first.
+ */
+static inline unsigned long __fls(unsigned long word)
+{
+ return 31 - __cntlz(word);
+}
#else
/* Use the generic implementation if we don't have the nsa/nsau instructions. */
@@ -90,6 +100,7 @@ static inline int fls (unsigned int x)
# include <asm-generic/bitops/__ffs.h>
# include <asm-generic/bitops/ffz.h>
# include <asm-generic/bitops/fls.h>
+# include <asm-generic/bitops/__fls.h>
#endif