auto import from //depot/cupcake/@135843

1 files changed, 42 insertions, 0 deletions

diff --git a/libc/kernel/common/linux/seqlock.h b/libc/kernel/common/linux/seqlock.h
new file mode 100644
index 0000000..a1e05d4
--- /dev/null
+++ b/libc/kernel/common/linux/seqlock.h
@@ -0,0 +1,42 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __LINUX_SEQLOCK_H
+#define __LINUX_SEQLOCK_H
+
+#include <linux/spinlock.h>
+#include <linux/preempt.h>
+
+typedef struct {
+ unsigned sequence;
+ spinlock_t lock;
+} seqlock_t;
+
+#define __SEQLOCK_UNLOCKED(lockname)   { 0, __SPIN_LOCK_UNLOCKED(lockname) }
+
+#define SEQLOCK_UNLOCKED   __SEQLOCK_UNLOCKED(old_style_seqlock_init)
+
+#define seqlock_init(x)   do { *(x) = (seqlock_t) __SEQLOCK_UNLOCKED(x); } while (0)
+
+#define DEFINE_SEQLOCK(x)   seqlock_t x = __SEQLOCK_UNLOCKED(x)
+
+#define SEQCNT_ZERO { 0 }
+#define seqcount_init(x) do { *(x) = (seqcount_t) SEQCNT_ZERO; } while (0)
+
+#define write_seqlock_irqsave(lock, flags)   do { local_irq_save(flags); write_seqlock(lock); } while (0)
+#define write_seqlock_irq(lock)   do { local_irq_disable(); write_seqlock(lock); } while (0)
+#define write_seqlock_bh(lock)   do { local_bh_disable(); write_seqlock(lock); } while (0)
+#define write_sequnlock_irqrestore(lock, flags)   do { write_sequnlock(lock); local_irq_restore(flags); } while(0)
+#define write_sequnlock_irq(lock)   do { write_sequnlock(lock); local_irq_enable(); } while(0)
+#define write_sequnlock_bh(lock)   do { write_sequnlock(lock); local_bh_enable(); } while(0)
+#define read_seqbegin_irqsave(lock, flags)   ({ local_irq_save(flags); read_seqbegin(lock); })
+#define read_seqretry_irqrestore(lock, iv, flags)   ({   int ret = read_seqretry(lock, iv);   local_irq_restore(flags);   ret;   })
+#endif