From patchwork Tue Nov 30 22:05:17 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: 12648255 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23105C433F5 for ; Tue, 30 Nov 2021 22:05:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6A5706B0072; Tue, 30 Nov 2021 17:05:31 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 62DAB6B0074; Tue, 30 Nov 2021 17:05:31 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4CDA96B0075; Tue, 30 Nov 2021 17:05:31 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0067.hostedemail.com [216.40.44.67]) by kanga.kvack.org (Postfix) with ESMTP id 3A56B6B0072 for ; Tue, 30 Nov 2021 17:05:31 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id DDF5E8249980 for ; Tue, 30 Nov 2021 22:05:20 +0000 (UTC) X-FDA: 78866978400.24.7281580 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by imf22.hostedemail.com (Postfix) with ESMTP id 28DD51902 for ; Tue, 30 Nov 2021 22:05:19 +0000 (UTC) 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=1638309919; 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=whZgRCTMmjC9f+f+aMuttd9b8g4xgLeF5Aiw73UkA4Q=; b=UKwfrCxeToujx+ezrstUF+qQpYtB1t4WRn7gyHkxdpkOjm5tPXnI9B4PIt728FEJteTMj6 Z/Jv3LTxy9BZ5e1JAC1d0PzLuFF4SD7GKgYDNcrsJkQbkAMwbyE/gfBCej2d7z1WwLR5Z6 TveyQfpECT58DNkipG4srjiTkdQ5muE= 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 11/31] kasan, page_alloc: move SetPageSkipKASanPoison in post_alloc_hook Date: Tue, 30 Nov 2021 23:05:17 +0100 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 28DD51902 X-Stat-Signature: 46kiesbaqc4yqn5dohti8goxojineorw Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=UKwfrCxe; spf=pass (imf22.hostedemail.com: domain of andrey.konovalov@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=andrey.konovalov@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-HE-Tag: 1638309919-548212 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Andrey Konovalov Pull the SetPageSkipKASanPoison() call in post_alloc_hook() out of the big if clause for better code readability. This also allows for more simplifications in the following patches. Also turn the kasan_has_integrated_init() check into the proper CONFIG_KASAN_HW_TAGS one. These checks evaluate to the same value, but logically skipping kasan poisoning has nothing to do with integrated init. Signed-off-by: Andrey Konovalov --- mm/page_alloc.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e3e9fefbce43..c78befc4e057 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2421,9 +2421,6 @@ inline void post_alloc_hook(struct page *page, unsigned int order, init = false; } if (kasan_has_integrated_init()) { - if (gfp_flags & __GFP_SKIP_KASAN_POISON) - SetPageSkipKASanPoison(page); - if (!init_tags) kasan_unpoison_pages(page, order, init); } else { @@ -2432,6 +2429,10 @@ inline void post_alloc_hook(struct page *page, unsigned int order, if (init) kernel_init_free_pages(page, 1 << order); } + /* Propagate __GFP_SKIP_KASAN_POISON to page flags. */ + if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && + (gfp_flags & __GFP_SKIP_KASAN_POISON)) + SetPageSkipKASanPoison(page); set_page_owner(page, order, gfp_flags); }