[PATCH] hugetlb: document the new location of page subpool pointer
From: Mike Kravetz <hidden>
Date: 2021-02-24 04:09:51
Also in:
lkml
Subsystem:
hugetlb subsystem, the rest · Maintainers:
Muchun Song, Oscar Salvador, Linus Torvalds
Expand comments, no functional change. Signed-off-by: Mike Kravetz <redacted> --- 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
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2.29.2