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Subject[PATCH 1/2] Create compat_sys_migrate_pages.
This is needed on bigendian 64bit architectures.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
include/linux/compat.h | 4 ++++
kernel/compat.c | 33 +++++++++++++++++++++++++++++++++
kernel/sys_ni.c | 1 +
3 files changed, 38 insertions(+), 0 deletions(-)

--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au

diff --git a/include/linux/compat.h b/include/linux/compat.h
index f155319..80b17f4 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -230,5 +230,9 @@ asmlinkage long compat_sys_adjtimex(stru
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 d4898aa..6952dd0 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -982,4 +982,37 @@ asmlinkage long compat_sys_move_pages(pi
}
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 0e53314..d7306d0 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);
--
1.4.3.2
-
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