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mm: memory: use nth_page() in clear/copy_subpage()

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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@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2023-12-29 16:22:07 +08:00 committed by Andrew Morton
parent 30afc8c342
commit 21fff064a2
1 changed files with 5 additions and 4 deletions
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9
mm/memory.c
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@ -6163,7 +6163,7 @@ static int clear_subpage(unsigned long addr, int idx, void *arg)
{
struct page *page = arg;
clear_user_highpage(page + idx, addr);
clear_user_highpage(nth_page(page, idx), addr);
return 0;
}
@ -6213,10 +6213,11 @@ 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;