mm/mempolicy: unify the parameter sanity check for mbind and set_mempolicy

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Link: https://lkml.kernel.org/r/1622560492-1294-4-git-send-email-feng.tang@intel.com
Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 5fb03dd242e448d5286f77a47a76385b3ce42162..b5f4f584009b0a107b04b4ec904f94f916dd79a6 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1440,6 +1440,7 @@ static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
        return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0;
 }
 
+/* Basic parameter sanity check used by both mbind() and set_mempolicy() */
 static inline int sanitize_mpol_flags(int *mode, unsigned short *flags)
 {
        *flags = *mode & MPOL_MODE_FLAGS;