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-rw-r--r--include/uapi/linux/mempolicy.h1
-rw-r--r--mm/mempolicy.c11
2 files changed, 7 insertions, 5 deletions
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index 3e835c9d847b..d23dca8367cc 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -21,6 +21,7 @@ enum {
MPOL_BIND,
MPOL_INTERLEAVE,
MPOL_LOCAL,
+ MPOL_NOOP, /* retain existing policy for range */
MPOL_MAX, /* always last member of enum */
};
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 54bd3e5ed776..c21e91477c4f 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -251,10 +251,10 @@ 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) {
+ if (mode == MPOL_DEFAULT || mode == MPOL_NOOP) {
if (nodes && !nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
- return NULL; /* simply delete any existing policy */
+ return NULL;
}
VM_BUG_ON(!nodes);
@@ -1147,7 +1147,7 @@ static long do_mbind(unsigned long start, unsigned long len,
if (start & ~PAGE_MASK)
return -EINVAL;
- if (mode == MPOL_DEFAULT)
+ if (mode == MPOL_DEFAULT || mode == MPOL_NOOP)
flags &= ~MPOL_MF_STRICT;
len = (len + PAGE_SIZE - 1) & PAGE_MASK;
@@ -2409,7 +2409,8 @@ static const char * const policy_modes[] =
[MPOL_PREFERRED] = "prefer",
[MPOL_BIND] = "bind",
[MPOL_INTERLEAVE] = "interleave",
- [MPOL_LOCAL] = "local"
+ [MPOL_LOCAL] = "local",
+ [MPOL_NOOP] = "noop", /* should not actually be used */
};
@@ -2460,7 +2461,7 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
break;
}
}
- if (mode >= MPOL_MAX)
+ if (mode >= MPOL_MAX || mode == MPOL_NOOP)
goto out;
switch (mode) {