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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-17 16:00:25 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:31 +0200 |
| commit | b6e9b0babb7a02ae4f00f053974609000f00950e (patch) | |
| tree | 0d549e6585c79ace69a06aa1004ec9ee42ec4e25 /kernel/compat.c | |
| parent | 7d4dd4f159b94003655b1688d9a4c0e2b6268ff8 (diff) | |
| download | linux-b6e9b0babb7a02ae4f00f053974609000f00950e.tar.gz linux-b6e9b0babb7a02ae4f00f053974609000f00950e.tar.bz2 linux-b6e9b0babb7a02ae4f00f053974609000f00950e.zip | |
mm: add kernel_migrate_pages() helper, move compat syscall to mm/mempolicy.c
Move compat_sys_migrate_pages() to mm/mempolicy.c and make it call a newly
introduced helper -- kernel_migrate_pages() -- instead of the syscall.
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'kernel/compat.c')
| -rw-r--r-- | kernel/compat.c | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/kernel/compat.c b/kernel/compat.c index 3f5fa8902e7d..51bdf1808943 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -508,39 +508,6 @@ COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, } return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); } - -COMPAT_SYSCALL_DEFINE4(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 /* |