#ifndef _ASM_X86_RWLOCK_H #define _ASM_X86_RWLOCK_H #include <asm/asm.h> #if CONFIG_NR_CPUS <= 2048 #ifndef __ASSEMBLY__ typedef union { s32 lock; s32 write; } arch_rwlock_t; #endif #define RW_LOCK_BIAS 0x00100000 #define READ_LOCK_SIZE(insn) __ASM_FORM(insn##l) #define READ_LOCK_ATOMIC(n) atomic_##n #define WRITE_LOCK_ADD(n) __ASM_FORM_COMMA(addl n) #define WRITE_LOCK_SUB(n) __ASM_FORM_COMMA(subl n) #define WRITE_LOCK_CMP RW_LOCK_BIAS #else /* CONFIG_NR_CPUS > 2048 */ #include <linux/const.h> #ifndef __ASSEMBLY__ typedef union { s64 lock; struct { u32 read; s32 write; }; } arch_rwlock_t; #endif #define RW_LOCK_BIAS (_AC(1,L) << 32) #define READ_LOCK_SIZE(insn) __ASM_FORM(insn##q) #define READ_LOCK_ATOMIC(n) atomic64_##n #define WRITE_LOCK_ADD(n) __ASM_FORM(incl) #define WRITE_LOCK_SUB(n) __ASM_FORM(decl) #define WRITE_LOCK_CMP 1 #endif /* CONFIG_NR_CPUS */ #define __ARCH_RW_LOCK_UNLOCKED { RW_LOCK_BIAS } /* Actual code is in asm/spinlock.h or in arch/x86/lib/rwlock.S */ #endif /* _ASM_X86_RWLOCK_H */