Commit 3fd59397 authored by Stephen Rothwell's avatar Stephen Rothwell Committed by Linus Torvalds
Browse files

[PATCH] Create compat_sys_migrate_pages 



This is needed on bigendian 64bit architectures.

Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Acked-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1f6f6164

include/linux/compat.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

kernel/compat.c

+33 −0
Original line number Diff line number Diff line
@@ -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

kernel/sys_ni.c

+1 −0
Original line number Diff line number Diff line
@@ -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);