5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Miaohe Lin <linmiaohe@xxxxxxxxxx> [ Upstream commit e2c1ab070fdc81010ec44634838d24fce9ff9e53 ] When page_handle_poison() fails to handle the hugepage or free page in retry path, soft_offline_page() will return 0 while -EBUSY is expected in this case. Consequently the user will think soft_offline_page succeeds while it in fact failed. So the user will not try again later in this case. Link: https://lkml.kernel.org/r/20230627112808.1275241-1-linmiaohe@xxxxxxxxxx Fixes: b94e02822deb ("mm,hwpoison: try to narrow window race for free pages") Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- mm/memory-failure.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 69d22af10adfc..bcd71d8736be5 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2284,10 +2284,13 @@ int soft_offline_page(unsigned long pfn, int flags) if (ret > 0) { ret = soft_offline_in_use_page(page); } else if (ret == 0) { - if (!page_handle_poison(page, true, false) && try_again) { - try_again = false; - flags &= ~MF_COUNT_INCREASED; - goto retry; + if (!page_handle_poison(page, true, false)) { + if (try_again) { + try_again = false; + flags &= ~MF_COUNT_INCREASED; + goto retry; + } + ret = -EBUSY; } } -- 2.40.1
