b7bb7d9b28
Blackfin's atomic primitives do not imply a full barrier as whitnessed
from its SMP smp_mb__{before,after}_clear_bit() implementations.
However since !SMP smp_mb() reduces to barrier() remove everything and
rely on the asm-generic/barrier.h implentation.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-1widdkdsb3c1titq8jez6g3g@git.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Steven Miao <realmz6@gmail.com>
Cc: adi-buildroot-devel@lists.sourceforge.net
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef _BLACKFIN_BITOPS_H
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#define _BLACKFIN_BITOPS_H
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#include <linux/compiler.h>
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#include <asm-generic/bitops/__ffs.h>
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#include <asm-generic/bitops/ffz.h>
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#include <asm-generic/bitops/fls.h>
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#include <asm-generic/bitops/__fls.h>
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/find.h>
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/ffs.h>
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#include <asm-generic/bitops/const_hweight.h>
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#include <asm-generic/bitops/lock.h>
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#include <asm-generic/bitops/ext2-atomic.h>
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#include <asm/barrier.h>
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#ifndef CONFIG_SMP
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#include <linux/irqflags.h>
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/*
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* clear_bit may not imply a memory barrier
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*/
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#include <asm-generic/bitops/atomic.h>
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#include <asm-generic/bitops/non-atomic.h>
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#else
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#include <asm/byteorder.h> /* swab32 */
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#include <linux/linkage.h>
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asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
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asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
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static inline void set_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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__raw_bit_set_asm(a, nr & 0x1f);
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}
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static inline void clear_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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__raw_bit_clear_asm(a, nr & 0x1f);
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}
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static inline void change_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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__raw_bit_toggle_asm(a, nr & 0x1f);
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}
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static inline int test_bit(int nr, const volatile unsigned long *addr)
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{
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volatile const unsigned long *a = addr + (nr >> 5);
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return __raw_bit_test_asm(a, nr & 0x1f) != 0;
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}
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static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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return __raw_bit_test_set_asm(a, nr & 0x1f);
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}
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static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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return __raw_bit_test_clear_asm(a, nr & 0x1f);
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}
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static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
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{
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volatile unsigned long *a = addr + (nr >> 5);
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return __raw_bit_test_toggle_asm(a, nr & 0x1f);
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}
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#define test_bit __skip_test_bit
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#include <asm-generic/bitops/non-atomic.h>
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#undef test_bit
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#endif /* CONFIG_SMP */
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/* Needs to be after test_bit and friends */
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#include <asm-generic/bitops/le.h>
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/*
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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static inline unsigned int __arch_hweight32(unsigned int w)
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{
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unsigned int res;
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__asm__ ("%0.l = ONES %1;"
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"%0 = %0.l (Z);"
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: "=d" (res) : "d" (w));
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return res;
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}
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static inline unsigned int __arch_hweight64(__u64 w)
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{
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return __arch_hweight32((unsigned int)(w >> 32)) +
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__arch_hweight32((unsigned int)w);
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}
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static inline unsigned int __arch_hweight16(unsigned int w)
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{
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return __arch_hweight32(w & 0xffff);
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}
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static inline unsigned int __arch_hweight8(unsigned int w)
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{
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return __arch_hweight32(w & 0xff);
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}
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#endif /* _BLACKFIN_BITOPS_H */
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