diff options
Diffstat (limited to 'arch/s390/include/asm/bitops.h')
| -rw-r--r-- | arch/s390/include/asm/bitops.h | 55 |
1 files changed, 34 insertions, 21 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h index 9b68e98a724f..8043f10da6b5 100644 --- a/arch/s390/include/asm/bitops.h +++ b/arch/s390/include/asm/bitops.h @@ -11,30 +11,25 @@ * big-endian system because, unlike little endian, the number of each * bit depends on the word size. * - * The bitop functions are defined to work on unsigned longs, so for an - * s390x system the bits end up numbered: + * The bitop functions are defined to work on unsigned longs, so the bits + * end up numbered: * |63..............0|127............64|191...........128|255...........192| - * and on s390: - * |31.....0|63....32|95....64|127...96|159..128|191..160|223..192|255..224| * * There are a few little-endian macros used mostly for filesystem - * bitmaps, these work on similar bit arrays layouts, but - * byte-oriented: + * bitmaps, these work on similar bit array layouts, but byte-oriented: * |7...0|15...8|23...16|31...24|39...32|47...40|55...48|63...56| * - * The main difference is that bit 3-5 (64b) or 3-4 (32b) in the bit - * number field needs to be reversed compared to the big-endian bit - * fields. This can be achieved by XOR with 0x38 (64b) or 0x18 (32b). + * The main difference is that bit 3-5 in the bit number field needs to be + * reversed compared to the big-endian bit fields. This can be achieved by + * XOR with 0x38. * - * We also have special functions which work with an MSB0 encoding: - * on an s390x system the bits are numbered: + * We also have special functions which work with an MSB0 encoding. + * The bits are numbered: * |0..............63|64............127|128...........191|192...........255| - * and on s390: - * |0.....31|32....63|64....95|96...127|128..159|160..191|192..223|224..255| * - * The main difference is that bit 0-63 (64b) or 0-31 (32b) in the bit - * number field needs to be reversed compared to the LSB0 encoded bit - * fields. This can be achieved by XOR with 0x3f (64b) or 0x1f (32b). + * The main difference is that bit 0-63 in the bit number field needs to be + * reversed compared to the LSB0 encoded bit fields. This can be achieved by + * XOR with 0x3f. * */ @@ -64,7 +59,6 @@ \ typecheck(unsigned long *, (__addr)); \ asm volatile( \ - __barrier \ __op_string " %0,%2,%1\n" \ __barrier \ : "=d" (__old), "+Q" (*(__addr)) \ @@ -276,12 +270,32 @@ static inline int test_bit(unsigned long nr, const volatile unsigned long *ptr) return (*addr >> (nr & 7)) & 1; } +static inline int test_and_set_bit_lock(unsigned long nr, + volatile unsigned long *ptr) +{ + if (test_bit(nr, ptr)) + return 1; + return test_and_set_bit(nr, ptr); +} + +static inline void clear_bit_unlock(unsigned long nr, + volatile unsigned long *ptr) +{ + smp_mb__before_atomic(); + clear_bit(nr, ptr); +} + +static inline void __clear_bit_unlock(unsigned long nr, + volatile unsigned long *ptr) +{ + smp_mb(); + __clear_bit(nr, ptr); +} + /* * Functions which use MSB0 bit numbering. - * On an s390x system the bits are numbered: + * The bits are numbered: * |0..............63|64............127|128...........191|192...........255| - * and on s390: - * |0.....31|32....63|64....95|96...127|128..159|160..191|192..223|224..255| */ unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size); unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size, @@ -446,7 +460,6 @@ static inline int fls(int word) #include <asm-generic/bitops/ffz.h> #include <asm-generic/bitops/find.h> #include <asm-generic/bitops/hweight.h> -#include <asm-generic/bitops/lock.h> #include <asm-generic/bitops/sched.h> #include <asm-generic/bitops/le.h> #include <asm-generic/bitops/ext2-atomic-setbit.h> |