+ fs-use-nth_page-in-place-of-direct-struct-page-manipulation.patch added to mm-hotfixes-unstable branch

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The patch titled
     Subject: fs: use nth_page() in place of direct struct page manipulation
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     fs-use-nth_page-in-place-of-direct-struct-page-manipulation.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-use-nth_page-in-place-of-direct-struct-page-manipulation.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: fs: use nth_page() in place of direct struct page manipulation
Date: Wed, 13 Sep 2023 16:12:47 -0400

When dealing with hugetlb pages, struct page is not guaranteed to be
contiguous on SPARSEMEM without VMEMMAP.  Use nth_page() to handle it
properly.

Link: https://lkml.kernel.org/r/20230913201248.452081-5-zi.yan@xxxxxxxx
Fixes: 38c1ddbde6c6 ("hugetlbfs: improve read HWPOISON hugepage")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/hugetlbfs/inode.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/hugetlbfs/inode.c~fs-use-nth_page-in-place-of-direct-struct-page-manipulation
+++ a/fs/hugetlbfs/inode.c
@@ -295,7 +295,7 @@ static size_t adjust_range_hwpoison(stru
 	size_t res = 0;
 
 	/* First subpage to start the loop. */
-	page += offset / PAGE_SIZE;
+	page = nth_page(page, offset / PAGE_SIZE);
 	offset %= PAGE_SIZE;
 	while (1) {
 		if (is_raw_hwpoison_page_in_hugepage(page))
@@ -309,7 +309,7 @@ static size_t adjust_range_hwpoison(stru
 			break;
 		offset += n;
 		if (offset == PAGE_SIZE) {
-			page++;
+			page = nth_page(page, 1);
 			offset = 0;
 		}
 	}
_

Patches currently in -mm which might be from ziy@xxxxxxxxxx are

mm-cma-use-nth_page-in-place-of-direct-struct-page-manipulation.patch
mm-hugetlb-use-nth_page-in-place-of-direct-struct-page-manipulation.patch
mm-memory_hotplug-use-pfn-math-in-place-of-direct-struct-page-manipulation.patch
fs-use-nth_page-in-place-of-direct-struct-page-manipulation.patch
mips-use-nth_page-in-place-of-direct-struct-page-manipulation.patch




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