mm: Define MAP_SYNC and VM_SYNC flags

Define new MAP_SYNC flag and corresponding VMA VM_SYNC flag. As the
MAP_SYNC flag is not part of LEGACY_MAP_MASK, currently it will be
refused by all MAP_SHARED_VALIDATE map attempts and silently ignored for
everything else.

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 5589b4bd4b85..ea78b37deeaa 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -664,6 +664,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
                 [ilog2(VM_ACCOUNT)]     = "ac",
                 [ilog2(VM_NORESERVE)]   = "nr",
                 [ilog2(VM_HUGETLB)]     = "ht",
+                [ilog2(VM_SYNC)]        = "sf",
                 [ilog2(VM_ARCH_1)]      = "ar",
                 [ilog2(VM_WIPEONFORK)]  = "wf",
                 [ilog2(VM_DONTDUMP)]    = "dd",