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s390/bitops: use atomic primitives for bitops 

Replace the bitops specific atomic update code by the functions
from atomic_ops.h. This saves a few lines of non-trivial code.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-11-11 16:22:47 +01:00
parent 126b30c3cb
commit 1993dbc7e0
1 changed files with 7 additions and 55 deletions
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62
arch/s390/include/asm/bitops.h
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@ -42,57 +42,9 @@
#include <linux/typecheck.h>
#include <linux/compiler.h>
#include <asm/atomic_ops.h>
#include <asm/barrier.h>
#define __BITOPS_NO_BARRIER "\n"
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
#define __BITOPS_OR "laog"
#define __BITOPS_AND "lang"
#define __BITOPS_XOR "laxg"
#define __BITOPS_BARRIER "bcr 14,0\n"
#define __BITOPS_LOOP(__addr, __val, __op_string, __barrier) \
({ \
unsigned long __old; \
\
typecheck(unsigned long *, (__addr)); \
asm volatile( \
__op_string " %0,%2,%1\n" \
__barrier \
: "=d" (__old), "+Q" (*(__addr)) \
: "d" (__val) \
: "cc", "memory"); \
__old; \
})
#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define __BITOPS_OR "ogr"
#define __BITOPS_AND "ngr"
#define __BITOPS_XOR "xgr"
#define __BITOPS_BARRIER "\n"
#define __BITOPS_LOOP(__addr, __val, __op_string, __barrier) \
({ \
unsigned long __old, __new; \
\
typecheck(unsigned long *, (__addr)); \
asm volatile( \
" lg %0,%2\n" \
"0: lgr %1,%0\n" \
__op_string " %1,%3\n" \
" csg %0,%1,%2\n" \
" jl 0b" \
: "=&d" (__old), "=&d" (__new), "+Q" (*(__addr))\
: "d" (__val) \
: "cc", "memory"); \
__old; \
})
#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */
#define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)
static inline unsigned long *
@ -128,7 +80,7 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *ptr)
}
#endif
mask = 1UL << (nr & (BITS_PER_LONG - 1));
__BITOPS_LOOP(addr, mask, __BITOPS_OR, __BITOPS_NO_BARRIER);
__atomic64_or(mask, addr);
}
static inline void clear_bit(unsigned long nr, volatile unsigned long *ptr)
@ -149,7 +101,7 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *ptr)
}
#endif
mask = ~(1UL << (nr & (BITS_PER_LONG - 1)));
__BITOPS_LOOP(addr, mask, __BITOPS_AND, __BITOPS_NO_BARRIER);
__atomic64_and(mask, addr);
}
static inline void change_bit(unsigned long nr, volatile unsigned long *ptr)
@ -170,7 +122,7 @@ static inline void change_bit(unsigned long nr, volatile unsigned long *ptr)
}
#endif
mask = 1UL << (nr & (BITS_PER_LONG - 1));
__BITOPS_LOOP(addr, mask, __BITOPS_XOR, __BITOPS_NO_BARRIER);
__atomic64_xor(mask, addr);
}
static inline int
@ -180,7 +132,7 @@ test_and_set_bit(unsigned long nr, volatile unsigned long *ptr)
unsigned long old, mask;
mask = 1UL << (nr & (BITS_PER_LONG - 1));
old = __BITOPS_LOOP(addr, mask, __BITOPS_OR, __BITOPS_BARRIER);
old = __atomic64_or_barrier(mask, addr);
return (old & mask) != 0;
}
@ -191,7 +143,7 @@ test_and_clear_bit(unsigned long nr, volatile unsigned long *ptr)
unsigned long old, mask;
mask = ~(1UL << (nr & (BITS_PER_LONG - 1)));
old = __BITOPS_LOOP(addr, mask, __BITOPS_AND, __BITOPS_BARRIER);
old = __atomic64_and_barrier(mask, addr);
return (old & ~mask) != 0;
}
@ -202,7 +154,7 @@ test_and_change_bit(unsigned long nr, volatile unsigned long *ptr)
unsigned long old, mask;
mask = 1UL << (nr & (BITS_PER_LONG - 1));
old = __BITOPS_LOOP(addr, mask, __BITOPS_XOR, __BITOPS_BARRIER);
old = __atomic64_xor_barrier(mask, addr);
return (old & mask) != 0;
}