From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDC6B12D152 for ; Tue, 6 Feb 2024 11:21:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707218516; cv=none; b=GKq4xibsWRa90+RMNf0uRLeyXONps84PHFMdNujt24mlEILClSlaaOJNyeMsseMvz7upb+SB25TxLUPiyc0ZwFBABSqmWrjKBac0GO/M5MX3hKjRGBAjIGZDq+Bbcyv5r8km7wA4UfHVDA9vIEUo3NPlAx1VoPFpCkrgT4P/3oU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707218516; c=relaxed/simple; bh=hyXJJ6hhmtLyDHUPOkw1GvU2c5nor7sucprHyDsi6J8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MGuetQGVu041pZ+sQ57YfKbPYuOlv9Fx+7fBguWefve9TE1H8NEXSvCStPE647owY8YvSTyizta9JFgW4kJr5MInUFmGxFShQyIqNH0zv0y5+aNJDOhc3WxclTHlJa4bl3GwvDfNJT3HKz83IpOcefadhfR7rTblidn+L5b5V7g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4TTglM0YqtzXh8Z; Tue, 6 Feb 2024 19:20:15 +0800 (CST) Received: from dggpemm100001.china.huawei.com (unknown [7.185.36.93]) by mail.maildlp.com (Postfix) with ESMTPS id 0644A1400D5; Tue, 6 Feb 2024 19:21:47 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 6 Feb 2024 19:21:46 +0800 From: Kefeng Wang To: Andrew Morton , CC: Tony Luck , Naoya Horiguchi , Miaohe Lin , Matthew Wilcox , David Hildenbrand , Muchun Song , Benjamin LaHaise , , , , Kefeng Wang Subject: [PATCH rfcv2 07/11] mm: add folio_mc_copy() Date: Tue, 6 Feb 2024 19:21:30 +0800 Message-ID: <20240206112134.1479464-8-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240206112134.1479464-1-wangkefeng.wang@huawei.com> References: <20240206112134.1479464-1-wangkefeng.wang@huawei.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm100001.china.huawei.com (7.185.36.93) Add a variant of folio_copy() which use copy_mc_highpage() to support machine check safe copy when folio copy. Signed-off-by: Kefeng Wang --- include/linux/mm.h | 1 + mm/util.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 68ca71407177..8818aa5a1755 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1300,6 +1300,7 @@ void put_pages_list(struct list_head *pages); 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); diff --git a/mm/util.c b/mm/util.c index 5faf3adc6f43..63e6e644eb5a 100644 --- a/mm/util.c +++ b/mm/util.c @@ -828,6 +828,26 @@ 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; + int ret = 0; + + for (;;) { + if (copy_mc_highpage(folio_page(dst, i), folio_page(src, i))) { + ret = -EFAULT; + break; + } + if (++i == nr) + break; + cond_resched(); + } + + return ret; +} +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; -- 2.27.0