[PATCH] lightweight robust futexes: compat

32-bit syscall compatibility support.  (This patch also moves all futex
related compat functionality into kernel/futex_compat.c.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Acked-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 24d659cdbafe..6d3a654be1ae 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -147,6 +147,24 @@ typedef struct compat_sigevent {
         } _sigev_un;
 } compat_sigevent_t;
 
+struct compat_robust_list {
+        compat_uptr_t                   next;
+};
+
+struct compat_robust_list_head {
+        struct compat_robust_list       list;
+        compat_long_t                   futex_offset;
+        compat_uptr_t                   list_op_pending;
+};
+
+extern void compat_exit_robust_list(struct task_struct *curr);
+
+asmlinkage long
+compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
+                           compat_size_t len);
+asmlinkage long
+compat_sys_get_robust_list(int pid, compat_uptr_t *head_ptr,
+                           compat_size_t __user *len_ptr);
 
 long compat_sys_semctl(int first, int second, int third, void __user *uptr);
 long compat_sys_msgsnd(int first, int second, int third, void __user *uptr);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index fd4848f2d750..20b4f0372e44 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -874,6 +874,9 @@ struct task_struct {
         int cpuset_mem_spread_rotor;
 #endif
         struct robust_list_head __user *robust_list;
+#ifdef CONFIG_COMPAT
+        struct compat_robust_list_head __user *compat_robust_list;
+#endif
 
         atomic_t fs_excl;       /* holding fs exclusive resources */
         struct rcu_head rcu;