From patchwork Mon Jan 29 07:09:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 13535057 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (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 E66804E1DD for ; Mon, 29 Jan 2024 07:09:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706512194; cv=none; b=csrjehTXRVz8LPpCLtd4V8s00GvVw3UN00n6fi1DUOaGwZdqDaicqQxqD/v16Qu+9AiZI85ue1DuHf0xEHY2i6ujCg7ukqHuEyeuSqMuawDGOq7SrlEZf8sLC8t/TUjILyJYq9sEXhsBJc+4Ydp8VbqW8nsD1ctbOu4fX66zDR0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706512194; c=relaxed/simple; bh=DX2lXcNhYKP7w4O8BfE3mMhNi9KvlISvzQ4hc3XUHIM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eEoE5AKV2krvBd+8I0PwwQCo6skcYkeNX92cvLnZwkWvCPlnY5lF9u4m2Uq3emE4Udga8rx8Z5yd9Mt6effz3xgq5DaaqQtyccxzNEoslkVXHgoSPWkifm57jV88/P/slkBPshWuWZQXwIfLpgKom5OCBaNKgrs/3sdBQ4W8pYc= 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=45.249.212.191 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 [172.19.88.234]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4TNfSy54GRz1FJfX; Mon, 29 Jan 2024 15:05:22 +0800 (CST) Received: from dggpemm100001.china.huawei.com (unknown [7.185.36.93]) by mail.maildlp.com (Postfix) with ESMTPS id 757FE140336; Mon, 29 Jan 2024 15:09:49 +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; Mon, 29 Jan 2024 15:09:48 +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 rfc 5/9] mm: add folio_mc_copy() Date: Mon, 29 Jan 2024 15:09:30 +0800 Message-ID: <20240129070934.3717659-6-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240129070934.3717659-1-wangkefeng.wang@huawei.com> References: <20240129070934.3717659-1-wangkefeng.wang@huawei.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 ac6b71cbdffb..fffa6025d8f9 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;