shm: add memfd_create() syscall

[pandora-kernel.git] / include / linux / bitops.h

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index a3ef66a..87a375f 100644 (file)
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -49,6 +49,26 @@ static inline unsigned long hweight_long(unsigned long w)
        return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
 }
 
+/**
+ * rol64 - rotate a 64-bit value left
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline __u64 rol64(__u64 word, unsigned int shift)
+{
+       return (word << shift) | (word >> (64 - shift));
+}
+
+/**
+ * ror64 - rotate a 64-bit value right
+ * @word: value to rotate
+ * @shift: bits to roll
+ */
+static inline __u64 ror64(__u64 word, unsigned int shift)
+{
+       return (word >> shift) | (word << (64 - shift));
+}
+
 /**
  * rol32 - rotate a 32-bit value left
  * @word: value to rotate
@@ -148,6 +168,21 @@ static inline unsigned long __ffs64(u64 word)
 
 #ifdef __KERNEL__
 
+#ifndef set_mask_bits
+#define set_mask_bits(ptr, _mask, _bits)       \
+({                                                             \
+       const typeof(*ptr) mask = (_mask), bits = (_bits);      \
+       typeof(*ptr) old, new;                                  \
+                                                               \
+       do {                                                    \
+               old = ACCESS_ONCE(*ptr);                        \
+               new = (old & ~mask) | bits;                     \
+       } while (cmpxchg(ptr, old, new) != old);                \
+                                                               \
+       new;                                                    \
+})
+#endif
+
 #ifndef find_last_bit
 /**
  * find_last_bit - find the last set bit in a memory region