From patchwork Tue Nov 30 21:41:55 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: 12694220 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 CEAEEC433F5 for ; Tue, 30 Nov 2021 21:46:28 +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=VeMalFpSU39eXpur9V72wm2Updv3EjkDk1H9nfayUXE=; b=xtQx7zRnPNozdW YSyocPRFJuYCylIC5VFuMMJITOmnpVO2/xaW8mxKiYbDBkiuCciGdUE6mhHUILzzdnKbQV8NfPQEw gkWKLf/WSM5g1siXKm6MAYxB82+jC+ZpPqyUw8//z0mAyyauIpKajWxZfXeyQP4IaJpdyiNgPuKBE Waz6/QErQdpo6Ob9/48aus7bqp1UospD1JUTn/3s/eUlQ0O1Bu/hWQcqdtZRBn7VX5Aj78lg9vUxl vKk/LkE+Z0aZTR2JXYqT7BV4gtzrOJa8MHs0hdchIqbku0DfcwDjafwAa3qtJLa2ItaVjOipv0hd2 QEXg4qWvOUago0Q8gXGQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1msAvw-006nxF-5Q; Tue, 30 Nov 2021 21:45:04 +0000 Received: from out2.migadu.com ([2001:41d0:2:aacc::]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1msAtD-006mKv-Oe for linux-arm-kernel@lists.infradead.org; Tue, 30 Nov 2021 21:42:17 +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=1638308517; 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=65+U35KJ8uZeSN1gKPKurxIT8sCbICO1X6+tJPPU8p8=; b=pd5RQW1fg9JO86uqW/+/GX68qEhmJFMEj86VxwwTGJ6Nt1qPv5AerBX2NPvdz+4xMW1nmW 6dL1DnCDR/lyCAIDVi9cFhQtfVg7SdJIS9xzUFPt8Fd9wt64pnXldci1TOllhPNPZNLW4z i/a1uetNVbp/lBBQt+kbyUeYfy5fFok= 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 , linux-arm-kernel@lists.infradead.org, Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH 08/31] kasan, page_alloc: refactor init checks in post_alloc_hook Date: Tue, 30 Nov 2021 22:41:55 +0100 Message-Id: <984104c118a451fc4afa2eadb7206065f13b7af2.1638308023.git.andreyknvl@google.com> 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-20211130_134215_999476_30F8598A X-CRM114-Status: GOOD ( 12.34 ) 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 This patch separates code for zeroing memory from the code clearing tags in post_alloc_hook(). This patch is not useful by itself but makes the simplifications in the following patches easier to follow. This patch does no functional changes. Signed-off-by: Andrey Konovalov --- mm/page_alloc.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2ada09a58e4b..0561cdafce36 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2406,19 +2406,21 @@ inline void post_alloc_hook(struct page *page, unsigned int order, kasan_alloc_pages(page, order, gfp_flags); } else { bool init = !want_init_on_free() && want_init_on_alloc(gfp_flags); + bool init_tags = init && (gfp_flags & __GFP_ZEROTAGS); kasan_unpoison_pages(page, order, init); - if (init) { - if (gfp_flags & __GFP_ZEROTAGS) { - int i; + if (init_tags) { + int i; - for (i = 0; i < 1 << order; i++) - tag_clear_highpage(page + i); - } else { - kernel_init_free_pages(page, 1 << order); - } + for (i = 0; i < 1 << order; i++) + tag_clear_highpage(page + i); + + init = false; } + + if (init) + kernel_init_free_pages(page, 1 << order); } set_page_owner(page, order, gfp_flags);