From patchwork Mon Dec 6 21:43:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: andrey.konovalov@linux.dev X-Patchwork-Id: 12694996 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DA6C7C433EF for ; Mon, 6 Dec 2021 21:51:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=g+m1u9hLMXNq+UsRpXa9RmWHG4+oSfpST70rAZGnlkU=; b=UmJTAfTdPyz1G1 dM+dK5c0armDQ7KYiI0Sjht3KcuraSDbQ5+4EcarpysvKhsaMOs0/yTe+LaX6By3Qga2PNwYeUF5n CmgUIpan/xGN2WMoK+qlWc9zaN1mu70mxgGEJqoy/Ed40c6Xjo/qeVDwLU8EX62S0kNlFwxC7IPzD VaGKwDMGlB6LsHxrLEhqYIHyMj59w2lXbvvwunOjIR7n3WcByEqVviOq1svh2tg+GoXpGpa0m6sXm SbfmrJ1WLImMoIUpNKJreOpLIr4zIW68DYRH8X4FBCjDQGxCRMtwlG20G+3FYqDkOXomDy2YH7ZZZ KF9QXSFl2v3KadNwgpMw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1muLra-0060hm-Mt; Mon, 06 Dec 2021 21:49:35 +0000 Received: from out2.migadu.com ([188.165.223.204]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1muLnC-005yuI-9W for linux-arm-kernel@lists.infradead.org; Mon, 06 Dec 2021 21:45:04 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1638827100; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ir/Gb9vyo5VTknMlksNZZRWU049BNvYKgeMRmdqw2Yw=; b=XpQsncOOxcG+6nrBl4/akzj9F0TaG5zHuqwPTROfRBfdqA3gnl7cCTF66gp5NNd5FY4oOM SCsrpzeNu7CVWNxoTU61TjuwuFEYJfADpRXcysY6EBkv63hV0/0Kun3qVA9G/XNX1Z2Fzx UgfLoBM9ztjAPWqZypQ/KRfHpuAX1eI= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko , Vincenzo Frascino , Catalin Marinas , Peter Collingbourne Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, Andrew Morton , linux-mm@kvack.org, Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH v2 11/34] kasan, page_alloc: combine tag_clear_highpage calls in post_alloc_hook Date: Mon, 6 Dec 2021 22:43:48 +0100 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211206_134502_563977_97D59FB0 X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Andrey Konovalov The patch moves tag_clear_highpage() loops out of the kasan_has_integrated_init() clause as a code simplification. This patch does no functional changes. Signed-off-by: Andrey Konovalov --- mm/page_alloc.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d33e0b0547be..781b75563276 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2404,30 +2404,30 @@ inline void post_alloc_hook(struct page *page, unsigned int order, * KASAN unpoisoning and memory initializion code must be * kept together to avoid discrepancies in behavior. */ + + /* + * If memory tags should be zeroed (which happens only when memory + * should be initialized as well). + */ + if (init_tags) { + int i; + + /* Initialize both memory and tags. */ + for (i = 0; i != 1 << order; ++i) + tag_clear_highpage(page + i); + + /* Note that memory is already initialized by the loop above. */ + init = false; + } if (kasan_has_integrated_init()) { if (gfp_flags & __GFP_SKIP_KASAN_POISON) SetPageSkipKASanPoison(page); - if (init_tags) { - int i; - - for (i = 0; i != 1 << order; ++i) - tag_clear_highpage(page + i); - } else { + if (!init_tags) kasan_unpoison_pages(page, order, init); - } } else { kasan_unpoison_pages(page, order, init); - if (init_tags) { - int i; - - for (i = 0; i < 1 << order; i++) - tag_clear_highpage(page + i); - - init = false; - } - if (init) kernel_init_free_pages(page, 1 << order); }