1f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner/**************************************************************************** 2f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner **************************************************************************** 3f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** 4f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** This header was automatically generated from a Linux kernel header 5f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** of the same name, to make information necessary for userspace to 6f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** call into the kernel available to libc. It contains only constants, 7f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** structures, and macros generated from the original header, and thus, 8f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** contains no copyrightable information. 9f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner *** 10f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner **************************************************************************** 11f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner ****************************************************************************/ 12f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#ifndef __LINUX_SEQLOCK_H 13f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define __LINUX_SEQLOCK_H 14f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 15f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#include <linux/spinlock.h> 16f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#include <linux/preempt.h> 17f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 18f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turnertypedef struct { 19f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner unsigned sequence; 20f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner spinlock_t lock; 21f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner} seqlock_t; 22f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 23f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define __SEQLOCK_UNLOCKED(lockname) { 0, __SPIN_LOCK_UNLOCKED(lockname) } 24f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 25f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define SEQLOCK_UNLOCKED __SEQLOCK_UNLOCKED(old_style_seqlock_init) 26f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 27f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define seqlock_init(x) do { *(x) = (seqlock_t) __SEQLOCK_UNLOCKED(x); } while (0) 28f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 29f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define DEFINE_SEQLOCK(x) seqlock_t x = __SEQLOCK_UNLOCKED(x) 30f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 31f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define SEQCNT_ZERO { 0 } 32f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define seqcount_init(x) do { *(x) = (seqcount_t) SEQCNT_ZERO; } while (0) 33f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner 34f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_seqlock_irqsave(lock, flags) do { local_irq_save(flags); write_seqlock(lock); } while (0) 35f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_seqlock_irq(lock) do { local_irq_disable(); write_seqlock(lock); } while (0) 36f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_seqlock_bh(lock) do { local_bh_disable(); write_seqlock(lock); } while (0) 37f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_sequnlock_irqrestore(lock, flags) do { write_sequnlock(lock); local_irq_restore(flags); } while(0) 38f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_sequnlock_irq(lock) do { write_sequnlock(lock); local_irq_enable(); } while(0) 39f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define write_sequnlock_bh(lock) do { write_sequnlock(lock); local_bh_enable(); } while(0) 40f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define read_seqbegin_irqsave(lock, flags) ({ local_irq_save(flags); read_seqbegin(lock); }) 41f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#define read_seqretry_irqrestore(lock, iv, flags) ({ int ret = read_seqretry(lock, iv); local_irq_restore(flags); ret; }) 42f13db29e2847a3760e403332ea3243915e0f4bf3David 'Digit' Turner#endif 43