The patch titled
Subject: mm: memory: use nth_page() in clear/copy_subpage()
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-use-nth_page-in-clear-copy_subpage.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-use-nth_page-in-clear-copy_subpage.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: memory: use nth_page() in clear/copy_subpage()
Date: Fri, 29 Dec 2023 16:22:07 +0800
The clear and copy of huge gigantic page has converted to use nth_page()
to handle the possible discontinuous struct page(SPARSEMEM without
VMEMMAP), but not change for the non-gigantic part, fix it too.
Link: https://lkml.kernel.org/r/20231229082207.60235-1-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/mm/memory.c~mm-memory-use-nth_page-in-clear-copy_subpage
+++ a/mm/memory.c
@@ -6143,7 +6143,7 @@ static int clear_subpage(unsigned long a
{
struct page *page = arg;
- clear_user_highpage(page + idx, addr);
+ clear_user_highpage(nth_page(page, idx), addr);
return 0;
}
@@ -6193,10 +6193,11 @@ struct copy_subpage_arg {
static int copy_subpage(unsigned long addr, int idx, void *arg)
{
struct copy_subpage_arg *copy_arg = arg;
+ struct page *dst = nth_page(copy_arg->dst, idx);
+ struct page *src = nth_page(copy_arg->src, idx);
- if (copy_mc_user_highpage(copy_arg->dst + idx, copy_arg->src + idx,
- addr, copy_arg->vma)) {
- memory_failure_queue(page_to_pfn(copy_arg->src + idx), 0);
+ if (copy_mc_user_highpage(dst, src, addr, copy_arg->vma)) {
+ memory_failure_queue(page_to_pfn(src), 0);
return -EHWPOISON;
}
return 0;
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-memory-use-nth_page-in-clear-copy_subpage.patch
