[PATCH] sys_move_pages: 32bit support (i386, x86_64)

sys_move_pages() support for 32bit (i386 plus x86_64 compat layer)

Add support for move_pages() on i386 and also add the compat functions
necessary to run 32 bit binaries on x86_64.

Add compat_sys_move_pages to the x86_64 32bit binary layer.  Note that it is
not up to date so I added the missing pieces.  Not sure if this is done the
right way.

[akpm@osdl.org: compile fix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 24 insertions, 0 deletions

diff --git a/kernel/compat.c b/kernel/compat.c
index c1601a84f8d8..ccea93e28954 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -21,6 +21,7 @@
 #include <linux/unistd.h>
 #include <linux/security.h>
 #include <linux/timex.h>
+#include <linux/migrate.h>
 
 #include <asm/uaccess.h>
 
@@ -934,3 +935,25 @@ asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 
         return ret;
 }
+
+#ifdef CONFIG_NUMA
+asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
+                void __user *pages32,
+                const int __user *nodes,
+                int __user *status,
+                int flags)
+{
+        const void __user * __user *pages;
+        int i;
+
+        pages = compat_alloc_user_space(nr_pages * sizeof(void *));
+        for (i = 0; i < nr_pages; i++) {
+                compat_uptr_t p;
+
+                if (get_user(p, (compat_uptr_t *)(pages32 + i)) ||
+                        put_user(compat_ptr(p), pages + i))
+                        return -EFAULT;
+        }
+        return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
+}
+#endif
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 597229749dec..6991bece67e8 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -133,3 +133,4 @@ cond_syscall(sys_mincore);
 cond_syscall(sys_madvise);
 cond_syscall(sys_mremap);
 cond_syscall(sys_remap_file_pages);
+cond_syscall(compat_sys_move_pages);