diff options
Diffstat (limited to 'backport-include/asm/atomic.h')
| -rw-r--r-- | backport-include/asm/atomic.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/backport-include/asm/atomic.h b/backport-include/asm/atomic.h new file mode 100644 index 0000000..cabdcfd --- /dev/null +++ b/backport-include/asm/atomic.h @@ -0,0 +1,37 @@ +#ifndef __BACKPORT_ASM_ATOMIC_H +#define __BACKPORT_ASM_ATOMIC_H +#include_next <asm/atomic.h> +#include <linux/version.h> + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0) +/* + * In many versions, several architectures do not seem to include an + * atomic64_t implementation, and do not include the software emulation from + * asm-generic/atomic64_t. + * Detect and handle this here. + */ +#include <asm/atomic.h> + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)) && !defined(ATOMIC64_INIT) && !defined(CONFIG_X86) && !((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)) && defined(CONFIG_ARM) && !defined(CONFIG_GENERIC_ATOMIC64)) +#include <asm-generic/atomic64.h> +#endif +#endif + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31) +#ifndef CONFIG_64BIT + +typedef struct { + long long counter; +} atomic64_t; + +#define atomic64_read LINUX_BACKPORT(atomic64_read) +extern long long atomic64_read(const atomic64_t *v); +#define atomic64_add_return LINUX_BACKPORT(atomic64_add_return) +extern long long atomic64_add_return(long long a, atomic64_t *v); + +#define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) + +#endif +#endif + +#endif /* __BACKPORT_ASM_ATOMIC_H */ |