percpu, module: implement and use is_kernel/module_percpu_address()

[safe/jmp/linux-2.6] / include / linux / eventfd.h

diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index b489fc6..91bb4f2 100644 (file)
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -8,23 +8,76 @@
 #ifndef _LINUX_EVENTFD_H
 #define _LINUX_EVENTFD_H
 
+#include <linux/fcntl.h>
+#include <linux/file.h>
+#include <linux/wait.h>
 
-#ifdef __KERNEL__
+/*
+ * CAREFUL: Check include/asm-generic/fcntl.h when defining
+ * new flags, since they might collide with O_* ones. We want
+ * to re-use O_* flags that couldn't possibly have a meaning
+ * from eventfd, in order to leave a free define-space for
+ * shared O_* flags.
+ */
+#define EFD_SEMAPHORE (1 << 0)
+#define EFD_CLOEXEC O_CLOEXEC
+#define EFD_NONBLOCK O_NONBLOCK
+
+#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
+#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
 
 #ifdef CONFIG_EVENTFD
 
+struct file *eventfd_file_create(unsigned int count, int flags);
+struct eventfd_ctx *eventfd_ctx_get(struct eventfd_ctx *ctx);
+void eventfd_ctx_put(struct eventfd_ctx *ctx);
 struct file *eventfd_fget(int fd);
-int eventfd_signal(struct file *file, int n);
+struct eventfd_ctx *eventfd_ctx_fdget(int fd);
+struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
+int eventfd_signal(struct eventfd_ctx *ctx, int n);
+ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt);
+int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait,
+                                 __u64 *cnt);
 
 #else /* CONFIG_EVENTFD */
 
-#define eventfd_fget(fd) ERR_PTR(-ENOSYS)
-static inline int eventfd_signal(struct file *file, int n)
-{ return 0; }
+/*
+ * Ugly ugly ugly error layer to support modules that uses eventfd but
+ * pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
+ */
+static inline struct file *eventfd_file_create(unsigned int count, int flags)
+{
+       return ERR_PTR(-ENOSYS);
+}
+
+static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
+{
+       return ERR_PTR(-ENOSYS);
+}
+
+static inline int eventfd_signal(struct eventfd_ctx *ctx, int n)
+{
+       return -ENOSYS;
+}
+
+static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
+{
+
+}
+
+static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait,
+                                      __u64 *cnt)
+{
+       return -ENOSYS;
+}
 
-#endif /* CONFIG_EVENTFD */
+static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
+                                               wait_queue_t *wait, __u64 *cnt)
+{
+       return -ENOSYS;
+}
 
-#endif /* __KERNEL__ */
+#endif
 
 #endif /* _LINUX_EVENTFD_H */