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From: Mike Kravetz <mike.kravetz@oracle.com>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Michal Hocko <mhocko@suse.com>,
	Oscar Salvador <osalvador@suse.de>,
	Muchun Song <songmuchun@bytedance.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH] hugetlb: document the new location of page subpool pointer
Date: Tue, 23 Feb 2021 20:04:39 -0800	[thread overview]
Message-ID: <20210224040439.351882-1-mike.kravetz@oracle.com> (raw)
In-Reply-To: <20210223180820.ee39f1544f2630d0eecf3a57@linux-foundation.org>

Expand comments, no functional change.

Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
---
 include/linux/hugetlb.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index cccd1aab69dd..c0467a7a1fe0 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -476,6 +476,9 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  * huegtlb page specific state flags.  These flags are located in page.private
  * of the hugetlb head page.  Functions created via the below macros should be
  * used to manipulate these flags.
+ * Note: The hugetlb page subpool pointer previously located at page.private
+ * was moved to page[1].private to make room for flags in the head page.  See
+ * hugetlb_page_subpool().
  *
  * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
  *	allocation time.  Cleared when page is fully instantiated.  Free
-- 
2.29.2


  reply	other threads:[~2021-02-24  4:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 14:57 [RFC] linux-next panic in hugepage_subpool_put_pages() Gerald Schaefer
2021-02-23 16:45 ` Gerald Schaefer
2021-02-23 18:06 ` Mike Kravetz
2021-02-23 23:58   ` Andrew Morton
2021-02-24  1:29     ` Mike Kravetz
2021-02-24  2:08       ` Andrew Morton
2021-02-24  4:04         ` Mike Kravetz [this message]
2021-02-24  8:20           ` [PATCH] hugetlb: document the new location of page subpool pointer Oscar Salvador
2021-02-24  8:48           ` [External] " Muchun Song
2021-02-24 10:06           ` David Hildenbrand

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