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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-17 16:12:22 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:33 +0200 |
| commit | e7dc9ad6e98eb8cc49b454d54e361f91aebc395f (patch) | |
| tree | e16b3d0f4eba41a39a648c2b4cb2edf6d1253f78 | |
| parent | 7addf44388255f6fa99c83e3e2ad79cef0813698 (diff) | |
| download | linux-e7dc9ad6e98eb8cc49b454d54e361f91aebc395f.tar.bz2 | |
mm: add kernel_mbind() helper; remove in-kernel call to syscall
Using the mm-internal kernel_mbind() helper allows us to get rid of the
mm-internal call to the sys_mbind() 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>
| -rw-r--r-- | mm/mempolicy.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 7399ede02b5f..e4d7d4c0b253 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1336,9 +1336,9 @@ static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; } -SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, - unsigned long, mode, const unsigned long __user *, nmask, - unsigned long, maxnode, unsigned, flags) +static long kernel_mbind(unsigned long start, unsigned long len, + unsigned long mode, const unsigned long __user *nmask, + unsigned long maxnode, unsigned int flags) { nodemask_t nodes; int err; @@ -1357,6 +1357,13 @@ SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, return do_mbind(start, len, mode, mode_flags, &nodes, flags); } +SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, + unsigned long, mode, const unsigned long __user *, nmask, + unsigned long, maxnode, unsigned int, flags) +{ + return kernel_mbind(start, len, mode, nmask, maxnode, flags); +} + /* Set the process memory policy */ SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask, unsigned long, maxnode) @@ -1575,7 +1582,7 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, return -EFAULT; } - return sys_mbind(start, len, mode, nm, nr_bits+1, flags); + return kernel_mbind(start, len, mode, nm, nr_bits+1, flags); } COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, |