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authorKefeng Wang <wangkefeng.wang@huawei.com>2024-06-26 10:53:24 +0200
committerAndrew Morton <akpm@linux-foundation.org>2024-07-06 20:53:19 +0200
commit02f4ee5a144cef6b26421cb42cca64bb4138d459 (patch)
tree7bc7ee3e5a53bd64167bf3c6a96d3d271a2ae359 /mm/util.c
parentmm: move memory_failure_queue() into copy_mc_[user]_highpage() (diff)
downloadlinux-02f4ee5a144cef6b26421cb42cca64bb4138d459.tar.xz
linux-02f4ee5a144cef6b26421cb42cca64bb4138d459.zip
mm: add folio_mc_copy()
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@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Jane Chu <jane.chu@oracle.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Jiaqi Yan <jiaqiyan@google.com> Cc: Lance Yang <ioworker0@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index fe723241b66f..172213f27c31 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -828,6 +828,23 @@ void folio_copy(struct folio *dst, struct folio *src)
}
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;