The patch titled
Subject: mm: add folio_mc_copy()
has been added to the -mm mm-unstable branch. Its filename is
mm-add-folio_mc_copy.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-folio_mc_copy.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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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: add folio_mc_copy()
Date: Wed, 26 Jun 2024 16:53:24 +0800
Add a #MC variant of folio_copy() which uses copy_mc_highpage() to support
#MC handled during folio copy, it will be used in folio migration soon.
Link: https://lkml.kernel.org/r/20240626085328.608006-3-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Reviewed-by: Jane Chu <jane.chu@xxxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Jiaqi Yan <jiaqiyan@xxxxxxxxxx>
Cc: Lance Yang <ioworker0@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 +
mm/util.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+)
--- a/include/linux/mm.h~mm-add-folio_mc_copy
+++ a/include/linux/mm.h
@@ -1291,6 +1291,7 @@ void put_pages_list(struct list_head *pa
void split_page(struct page *page, unsigned int order);
void folio_copy(struct folio *dst, struct folio *src);
+int folio_mc_copy(struct folio *dst, struct folio *src);
unsigned long nr_free_buffer_pages(void);
--- a/mm/util.c~mm-add-folio_mc_copy
+++ a/mm/util.c
@@ -828,6 +828,23 @@ void folio_copy(struct folio *dst, struc
}
EXPORT_SYMBOL(folio_copy);
+int folio_mc_copy(struct folio *dst, struct folio *src)
+{
+ long nr = folio_nr_pages(src);
+ long i = 0;
+
+ for (;;) {
+ if (copy_mc_highpage(folio_page(dst, i), folio_page(src, i)))
+ return -EHWPOISON;
+ if (++i == nr)
+ break;
+ cond_resched();
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(folio_mc_copy);
+
int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS;
int sysctl_overcommit_ratio __read_mostly = 50;
unsigned long sysctl_overcommit_kbytes __read_mostly;
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
fs-proc-task_mmu-use-folio-api-in-pte_is_pinned.patch
mm-remove-page_maybe_dma_pinned.patch
mm-remove-page_maybe_dma_pinned-fix.patch
fb_defio-use-a-folio-in-fb_deferred_io_work.patch
mm-remove-page_mkclean.patch
mm-memory-convert-clear_huge_page-to-folio_zero_user.patch
mm-memory-use-folio-in-struct-copy_subpage_arg.patch
mm-memory-improve-copy_user_large_folio.patch
mm-memory-rename-pages_per_huge_page-to-nr_pages.patch
mm-move-memory_failure_queue-into-copy_mc__highpage.patch
mm-add-folio_mc_copy.patch
mm-migrate-split-folio_migrate_mapping.patch
mm-migrate-support-poisoned-recover-from-migrate-folio.patch
fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio.patch
mm-migrate-remove-folio_migrate_copy.patch
