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authorYang Shi <yang.shi@linux.alibaba.com>2018-10-26 15:08:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-26 16:26:35 -0700
commitcc4b8c794f476076c9ce19f43eb4d98dc4b5e155 (patch)
treeb763fc754ac1b54ab155f18b2ac5dacc1b97bb30 /include
parent9bc8039e715da3b53dbac89525323a9f2f69b7b5 (diff)
mm: dax: add comment for PFN_SPECIAL
The comment for PFN_SPECIAL is missed in pfn_t.h. Add comment to get consistent with other pfn flags. Link: http://lkml.kernel.org/r/1538086549-100536-1-git-send-email-yang.shi@linux.alibaba.com Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Suggested-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pfn_t.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 673546ba7342..7bb77850c65a 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -9,6 +9,8 @@
* PFN_SG_LAST - pfn references a page and is the last scatterlist entry
* PFN_DEV - pfn is not covered by system memmap by default
* PFN_MAP - pfn has a dynamic page mapping established by a device driver
+ * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not
+ * get_user_pages
*/
#define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))