st_smi: Add support for SPEAr SMI driver

[karo-tx-uboot.git] / include / linux / bitops.h

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 387a81813b9903c480fa2bed141284058d863347..e724310298610bb7c1230ecff1c8d158df28c6d4 100644 (file)
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -38,6 +38,43 @@ static inline int generic_ffs(int x)
        return r;
 }
 
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static inline int generic_fls(int x)
+{
+       int r = 32;
+
+       if (!x)
+               return 0;
+       if (!(x & 0xffff0000u)) {
+               x <<= 16;
+               r -= 16;
+       }
+       if (!(x & 0xff000000u)) {
+               x <<= 8;
+               r -= 8;
+       }
+       if (!(x & 0xf0000000u)) {
+               x <<= 4;
+               r -= 4;
+       }
+       if (!(x & 0xc0000000u)) {
+               x <<= 2;
+               r -= 2;
+       }
+       if (!(x & 0x80000000u)) {
+               x <<= 1;
+               r -= 1;
+       }
+       return r;
+}
+
+
 /*
  * hweightN: returns the hamming weight (i.e. the number
  * of bits set) of a N-bit word
@@ -74,14 +111,22 @@ static inline unsigned int generic_hweight8(unsigned int w)
 
 /* linux/include/asm-generic/bitops/non-atomic.h */
 
-#ifndef __set_bit
+#ifndef PLATFORM__SET_BIT
 # define __set_bit generic_set_bit
 #endif
 
-#ifndef __clear_bit
+#ifndef PLATFORM__CLEAR_BIT
 # define __clear_bit generic_clear_bit
 #endif
 
+#ifndef PLATFORM_FFS
+# define ffs generic_ffs
+#endif
+
+#ifndef PLATFORM_FLS
+# define fls generic_fls
+#endif
+
 /**
  * __set_bit - Set a bit in memory
  * @nr: the bit to set