From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f71.google.com (mail-wm0-f71.google.com [74.125.82.71]) by kanga.kvack.org (Postfix) with ESMTP id 5C5E76B038A for ; Mon, 6 Mar 2017 05:33:42 -0500 (EST) Received: by mail-wm0-f71.google.com with SMTP id t193so27811308wmt.4 for ; Mon, 06 Mar 2017 02:33:42 -0800 (PST) Received: from mail-wm0-f66.google.com (mail-wm0-f66.google.com. [74.125.82.66]) by mx.google.com with ESMTPS id u5si25317973wru.142.2017.03.06.02.33.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Mar 2017 02:33:41 -0800 (PST) Received: by mail-wm0-f66.google.com with SMTP id n11so12957669wma.0 for ; Mon, 06 Mar 2017 02:33:41 -0800 (PST) From: Michal Hocko Subject: [PATCH 8/9] md: use kvmalloc rather than opencoded variant Date: Mon, 6 Mar 2017 11:33:26 +0100 Message-Id: <20170306103327.2766-4-mhocko@kernel.org> In-Reply-To: <20170306103327.2766-1-mhocko@kernel.org> References: <20170306103032.2540-1-mhocko@kernel.org> <20170306103327.2766-1-mhocko@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, LKML , Michal Hocko , Mike Snitzer , Mikulas Patocka , Vlastimil Babka From: Michal Hocko copy_params uses kmalloc with vmalloc fallback. We already have a helper for that - kvmalloc. This caller requires GFP_NOIO semantic so it hasn't been converted with many others by previous patches. All we need to achieve this semantic is to use the scope memalloc_noio_{save,restore} around kvmalloc. Cc: Mikulas Patocka Cc: Mike Snitzer Acked-by: Vlastimil Babka Signed-off-by: Michal Hocko --- drivers/md/dm-ioctl.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 4da6fc6b1ffd..4951bf99dfb1 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1699,6 +1699,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern struct dm_ioctl *dmi; int secure_data; const size_t minimum_data_size = offsetof(struct dm_ioctl, data); + unsigned noio_flag; if (copy_from_user(param_kernel, user, minimum_data_size)) return -EFAULT; @@ -1721,15 +1722,9 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern * Use kmalloc() rather than vmalloc() when we can. */ dmi = NULL; - if (param_kernel->data_size <= KMALLOC_MAX_SIZE) - dmi = kmalloc(param_kernel->data_size, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); - - if (!dmi) { - unsigned noio_flag; - noio_flag = memalloc_noio_save(); - dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL); - memalloc_noio_restore(noio_flag); - } + noio_flag = memalloc_noio_save(); + dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL); + memalloc_noio_restore(noio_flag); if (!dmi) { if (secure_data && clear_user(user, param_kernel->data_size)) -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org