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authorMel Gorman <mgorman@suse.de>2012-11-16 09:37:58 +0000
committerMel Gorman <mgorman@suse.de>2012-12-11 14:42:44 +0000
commita720094ded8cbb303111035be91858011d2eac71 (patch)
treeceb9a2cf7f415e44f4f62a324382ec1de4a3bead /mm/mempolicy.c
parent4b10e7d562c90d0a72f324832c26653947a07381 (diff)
downloadlinux-a720094ded8cbb303111035be91858011d2eac71.tar.gz
mm: mempolicy: Hide MPOL_NOOP and MPOL_MF_LAZY from userspace for now
The use of MPOL_NOOP and MPOL_MF_LAZY to allow an application to explicitly request lazy migration is a good idea but the actual API has not been well reviewed and once released we have to support it. For now this patch prevents an application using the services. This will need to be revisited. Signed-off-by: Mel Gorman <mgorman@suse.de>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 75d4600a5e9..a7a62fe7c28 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -252,7 +252,7 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
pr_debug("setting mode %d flags %d nodes[0] %lx\n",
mode, flags, nodes ? nodes_addr(*nodes)[0] : -1);
- if (mode == MPOL_DEFAULT || mode == MPOL_NOOP) {
+ if (mode == MPOL_DEFAULT) {
if (nodes && !nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
return NULL;
@@ -1186,7 +1186,7 @@ static long do_mbind(unsigned long start, unsigned long len,
if (start & ~PAGE_MASK)
return -EINVAL;
- if (mode == MPOL_DEFAULT || mode == MPOL_NOOP)
+ if (mode == MPOL_DEFAULT)
flags &= ~MPOL_MF_STRICT;
len = (len + PAGE_SIZE - 1) & PAGE_MASK;
@@ -1241,7 +1241,7 @@ static long do_mbind(unsigned long start, unsigned long len,
flags | MPOL_MF_INVERT, &pagelist);
err = PTR_ERR(vma); /* maybe ... */
- if (!IS_ERR(vma) && mode != MPOL_NOOP)
+ if (!IS_ERR(vma))
err = mbind_range(mm, start, end, new);
if (!err) {
@@ -2530,7 +2530,6 @@ static const char * const policy_modes[] =
[MPOL_BIND] = "bind",
[MPOL_INTERLEAVE] = "interleave",
[MPOL_LOCAL] = "local",
- [MPOL_NOOP] = "noop", /* should not actually be used */
};
@@ -2581,7 +2580,7 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
break;
}
}
- if (mode >= MPOL_MAX || mode == MPOL_NOOP)
+ if (mode >= MPOL_MAX)
goto out;
switch (mode) {