linux-kernel - [PATCH] mm: dax: add comment for PFN

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Message-Id: <1538077089-14550-1-git-send-email-yang.shi@linux.alibaba.com>
Date:   Fri, 28 Sep 2018 03:38:09 +0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     dan.j.williams@...el.com, akpm@...ux-foundation.org
Cc:     yang.shi@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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.

Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>
---
 include/linux/pfn_t.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 21713dc..d2e5dd4 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -9,6 +9,7 @@
  * 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 - indicates that _PAGE_SPECIAL should be used for DAX ptes
  */
 #define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
 #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
-- 
1.8.3.1