Commit cc4b8c79 authored Oct 26, 2018 by Yang Shi Committed by Linus Torvalds Oct 26, 2018

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>

parent 9bc8039e

include/linux/pfn_t.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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))

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