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https://github.com/edk2-porting/linux-next.git
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8c0b8139c8
The LL/SC and IRQ versions were using generic stubs while the GRB version was just reimplementing what it already had for the standard cmpxchg() code. As we have optimized cmpxchg() implementations that are decoupled from the atomic code, simply falling back on the generic wrapper does the right thing. With this in place the GRB case is unaffected while the LL/SC case gets to use its optimized cmpxchg(). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#ifndef __ASM_SH_ATOMIC_H
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#define __ASM_SH_ATOMIC_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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*/
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/system.h>
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#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v,i) ((v)->counter = (i))
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#if defined(CONFIG_GUSA_RB)
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#include <asm/atomic-grb.h>
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#elif defined(CONFIG_CPU_SH4A)
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#include <asm/atomic-llsc.h>
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#else
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#include <asm/atomic-irq.h>
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#endif
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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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#define atomic_dec_return(v) atomic_sub_return(1, (v))
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#define atomic_inc_return(v) atomic_add_return(1, (v))
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#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
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#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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#define atomic_inc(v) atomic_add(1, (v))
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#define atomic_dec(v) atomic_sub(1, (v))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
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/**
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* atomic_add_unless - add unless the number is a given value
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* @v: pointer of type atomic_t
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* @a: the amount to add to v...
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* @u: ...unless v is equal to u.
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*
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* Atomically adds @a to @v, so long as it was not @u.
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* Returns non-zero if @v was not @u, and zero otherwise.
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*/
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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 c, old;
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c = atomic_read(v);
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for (;;) {
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if (unlikely(c == (u)))
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break;
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old = atomic_cmpxchg((v), c, c + (a));
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if (likely(old == c))
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break;
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c = old;
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}
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return c != (u);
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}
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#define smp_mb__before_atomic_dec() smp_mb()
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#define smp_mb__after_atomic_dec() smp_mb()
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#define smp_mb__before_atomic_inc() smp_mb()
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#define smp_mb__after_atomic_inc() smp_mb()
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#include <asm-generic/atomic-long.h>
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#include <asm-generic/atomic64.h>
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#endif /* __ASM_SH_ATOMIC_H */
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