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a37b95895a
Without this a user may encounter the following error. arch/arm/include/asm/atomic.h:38:2: error: implicit declaration of function ‘smp_mb’ With the #error pragma a user is a least pointed to the specific section in the file that's causing the problem arch/arm/include/asm/atomic.h:21:2: error: #error ARM architecture version (CONFIG_ARMV*) not set or unsupported. Acked-by: Alexander Kartashov <alekskartashov@parallels.com> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
#ifndef __CR_ATOMIC_H__
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#define __CR_ATOMIC_H__
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typedef struct {
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int counter;
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} atomic_t;
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/* Copied from the Linux kernel header arch/arm/include/asm/atomic.h */
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#if defined(CONFIG_ARMV7)
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#define smp_mb() __asm__ __volatile__ ("dmb" : : : "memory")
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#elif defined(CONFIG_ARMV6)
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#define smp_mb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory")
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#else
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#error ARM architecture version (CONFIG_ARMV*) not set or unsupported.
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#endif
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static inline int atomic_read(const atomic_t *v)
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{
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return (*(volatile int *)&(v)->counter);
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}
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static inline void atomic_set(atomic_t *v, int i)
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{
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v->counter = i;
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}
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#define atomic_get atomic_read
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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smp_mb();
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__asm__ __volatile__("@ atomic_add_return\n"
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"1: ldrex %0, [%3]\n"
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" add %0, %0, %4\n"
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" strex %1, %0, [%3]\n"
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" teq %1, #0\n"
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" bne 1b\n"
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: "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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smp_mb();
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return result;
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}
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long tmp;
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int result;
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smp_mb();
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__asm__ __volatile__("@ atomic_sub_return\n"
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"1: ldrex %0, [%3]\n"
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" sub %0, %0, %4\n"
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" strex %1, %0, [%3]\n"
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" teq %1, #0\n"
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" bne 1b\n"
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: "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
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: "r" (&v->counter), "Ir" (i)
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: "cc");
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smp_mb();
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return result;
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}
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static inline int atomic_inc(atomic_t *v) { return atomic_add_return(1, v) - 1; }
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static inline int atomic_add(int val, atomic_t *v) { return atomic_add_return(val, v) - val; }
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static inline int atomic_dec(atomic_t *v) { return atomic_sub_return(1, v) + 1; }
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/* true if the result is 0, or false for all other cases. */
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#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
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#define atomic_inc_return(v) (atomic_add_return(1, v))
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#endif /* __CR_ATOMIC_H__ */
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