stacktrace: fix header file for !CONFIG_STACKTRACE

[karo-tx-linux.git] / include / linux / mount.h

diff --git a/include/linux/mount.h b/include/linux/mount.h
index 1b7e178b0d8472549de308667343b15d4f44aa56..6d3047d8c91c877b9243a5093557ef77c5e61774 100644 (file)
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -33,7 +33,7 @@ struct mnt_namespace;
 
 #define MNT_SHARED     0x1000  /* if the vfsmount is a shared mount */
 #define MNT_UNBINDABLE 0x2000  /* if the vfsmount is a unbindable mount */
-#define MNT_PNODE_MASK 0x3000  /* propogation flag mask */
+#define MNT_PNODE_MASK 0x3000  /* propagation flag mask */
 
 struct vfsmount {
        struct list_head mnt_hash;
@@ -43,9 +43,8 @@ struct vfsmount {
        struct super_block *mnt_sb;     /* pointer to superblock */
        struct list_head mnt_mounts;    /* list of children, anchored here */
        struct list_head mnt_child;     /* and going through their mnt_child */
-       atomic_t mnt_count;
        int mnt_flags;
-       int mnt_expiry_mark;            /* true if marked for expiry */
+       /* 4 bytes hole on 64bits arches */
        char *mnt_devname;              /* Name of device e.g. /dev/dsk/hda1 */
        struct list_head mnt_list;
        struct list_head mnt_expire;    /* link in fs-specific expiry list */
@@ -54,6 +53,13 @@ struct vfsmount {
        struct list_head mnt_slave;     /* slave list entry */
        struct vfsmount *mnt_master;    /* slave is on master->mnt_slave_list */
        struct mnt_namespace *mnt_ns;   /* containing namespace */
+       /*
+        * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
+        * to let these frequently modified fields in a separate cache line
+        * (so that reads of mnt_flags wont ping-pong on SMP machines)
+        */
+       atomic_t mnt_count;
+       int mnt_expiry_mark;            /* true if marked for expiry */
        int mnt_pinned;
 };