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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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17b40213ab
Cris fully relies on asm-generic/barrier.h, therefore its smp_mb() is barrier(), thus we can use the default implementation that uses smp_mb(). (Include asm/system.h and asm/barrier.h to avoid header dependency hell.) Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-wvewbe8os3s1e4pt1cdotuee@git.kernel.org Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mikael Starvik <starvik@axis.com> Cc: linux-cris-kernel@axis.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
157 lines
3.2 KiB
C
157 lines
3.2 KiB
C
/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
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#ifndef __ASM_CRIS_ATOMIC__
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#define __ASM_CRIS_ATOMIC__
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/cmpxchg.h>
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#include <arch/atomic.h>
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#include <arch/system.h>
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#include <asm/barrier.h>
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) (*(volatile int *)&(v)->counter)
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#define atomic_set(v,i) (((v)->counter) = (i))
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/* These should be written in asm but we do it in C for now. */
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static inline void atomic_add(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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v->counter += i;
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cris_atomic_restore(v, flags);
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}
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static inline void atomic_sub(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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v->counter -= i;
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cris_atomic_restore(v, flags);
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}
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static inline int atomic_add_return(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = (v->counter += i);
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cris_atomic_restore(v, flags);
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return retval;
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}
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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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static inline int atomic_sub_return(int i, volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = (v->counter -= i);
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = (v->counter -= i) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline void atomic_inc(volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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(v->counter)++;
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cris_atomic_restore(v, flags);
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}
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static inline void atomic_dec(volatile atomic_t *v)
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{
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unsigned long flags;
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cris_atomic_save(v, flags);
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(v->counter)--;
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cris_atomic_restore(v, flags);
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}
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static inline int atomic_inc_return(volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = ++(v->counter);
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_dec_return(volatile atomic_t *v)
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{
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unsigned long flags;
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int retval;
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cris_atomic_save(v, flags);
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retval = --(v->counter);
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_dec_and_test(volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = --(v->counter) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_inc_and_test(volatile atomic_t *v)
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{
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int retval;
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unsigned long flags;
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cris_atomic_save(v, flags);
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retval = ++(v->counter) == 0;
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cris_atomic_restore(v, flags);
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return retval;
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}
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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unsigned long flags;
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cris_atomic_save(v, flags);
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ret = v->counter;
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if (likely(ret == old))
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v->counter = new;
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cris_atomic_restore(v, flags);
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return ret;
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}
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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static inline int __atomic_add_unless(atomic_t *v, int a, int u)
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{
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int ret;
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unsigned long flags;
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cris_atomic_save(v, flags);
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ret = v->counter;
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if (ret != u)
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v->counter += a;
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cris_atomic_restore(v, flags);
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return ret;
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}
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#endif
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