[PATCH] Create compat_sys_migrate_pages

This is needed on bigendian 64bit architectures.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 38 insertions, 0 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index f1553196826f..80b17f440ec1 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -230,5 +230,9 @@ asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 extern int compat_printk(const char *fmt, ...);
 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
 
+asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
+                compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
+                const compat_ulong_t __user *new_nodes);
+
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */
diff --git a/kernel/compat.c b/kernel/compat.c
index d4898aad6cfa..6952dd057300 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -982,4 +982,37 @@ asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
         }
         return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
 }
+
+asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
+                        compat_ulong_t maxnode,
+                        const compat_ulong_t __user *old_nodes,
+                        const compat_ulong_t __user *new_nodes)
+{
+        unsigned long __user *old = NULL;
+        unsigned long __user *new = NULL;
+        nodemask_t tmp_mask;
+        unsigned long nr_bits;
+        unsigned long size;
+
+        nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
+        size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
+        if (old_nodes) {
+                if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
+                        return -EFAULT;
+                old = compat_alloc_user_space(new_nodes ? size * 2 : size);
+                if (new_nodes)
+                        new = old + size / sizeof(unsigned long);
+                if (copy_to_user(old, nodes_addr(tmp_mask), size))
+                        return -EFAULT;
+        }
+        if (new_nodes) {
+                if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
+                        return -EFAULT;
+                if (new == NULL)
+                        new = compat_alloc_user_space(size);
+                if (copy_to_user(new, nodes_addr(tmp_mask), size))
+                        return -EFAULT;
+        }
+        return sys_migrate_pages(pid, nr_bits + 1, old, new);
+}
 #endif
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 0e53314b14de..d7306d0f3dfc 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -135,6 +135,7 @@ cond_syscall(sys_madvise);
 cond_syscall(sys_mremap);
 cond_syscall(sys_remap_file_pages);
 cond_syscall(compat_sys_move_pages);
+cond_syscall(compat_sys_migrate_pages);
 
 /* block-layer dependent */
 cond_syscall(sys_bdflush);