[PATCH] kprobes: no probes on critical path

[linux-2.6-omap-h63xx.git] / include / linux / aio.h

diff --git a/include/linux/aio.h b/include/linux/aio.h
index 60def658b2462f3282c9802a6241b67c3b441b65..49fd37629ee475a64a7f82a84e74e5e1e204f9cc 100644 (file)
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -24,7 +24,12 @@ struct kioctx;
 #define KIOCB_SYNC_KEY         (~0U)
 
 /* ki_flags bits */
-#define KIF_LOCKED             0
+/*
+ * This may be used for cancel/retry serialization in the future, but
+ * for now it's unused and we probably don't want modules to even
+ * think they can use it.
+ */
+/* #define KIF_LOCKED          0 */
 #define KIF_KICKED             1
 #define KIF_CANCELLED          2
 
@@ -119,7 +124,7 @@ struct kiocb {
                (x)->ki_users = 1;                      \
                (x)->ki_key = KIOCB_SYNC_KEY;           \
                (x)->ki_filp = (filp);                  \
-               (x)->ki_ctx = &tsk->active_mm->default_kioctx;  \
+               (x)->ki_ctx = NULL;                     \
                (x)->ki_cancel = NULL;                  \
                (x)->ki_dtor = NULL;                    \
                (x)->ki_obj.tsk = tsk;                  \
@@ -178,6 +183,7 @@ struct kioctx {
        struct list_head        active_reqs;    /* used for cancellation */
        struct list_head        run_list;       /* used for kicked reqs */
 
+       /* sys_io_setup currently limits this to an unsigned int */
        unsigned                max_reqs;
 
        struct aio_ring_info    ring_info;
@@ -204,8 +210,15 @@ struct kioctx *lookup_ioctx(unsigned long ctx_id);
 int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
                                  struct iocb *iocb));
 
-#define get_ioctx(kioctx)      do { if (unlikely(atomic_read(&(kioctx)->users) <= 0)) BUG(); atomic_inc(&(kioctx)->users); } while (0)
-#define put_ioctx(kioctx)      do { if (unlikely(atomic_dec_and_test(&(kioctx)->users))) __put_ioctx(kioctx); else if (unlikely(atomic_read(&(kioctx)->users) < 0)) BUG(); } while (0)
+#define get_ioctx(kioctx) do {                                         \
+       BUG_ON(unlikely(atomic_read(&(kioctx)->users) <= 0));           \
+       atomic_inc(&(kioctx)->users);                                   \
+} while (0)
+#define put_ioctx(kioctx) do {                                         \
+       BUG_ON(unlikely(atomic_read(&(kioctx)->users) <= 0));           \
+       if (unlikely(atomic_dec_and_test(&(kioctx)->users)))            \
+               __put_ioctx(kioctx);                                    \
+} while (0)
 
 #define in_aio() !is_sync_wait(current->io_wait)
 /* may be used for debugging */
@@ -229,7 +242,7 @@ static inline struct kiocb *list_kiocb(struct list_head *h)
 }
 
 /* for sysctl: */
-extern atomic_t aio_nr;
-extern unsigned aio_max_nr;
+extern unsigned long aio_nr;
+extern unsigned long aio_max_nr;
 
 #endif /* __LINUX__AIO_H */