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Tue, 21 Dec 2021 04:12:01 -0800 (PST) Date: Tue, 21 Dec 2021 13:11:56 +0100 From: Marco Elver To: andrey.konovalov@linux.dev Cc: Alexander Potapenko , Andrew Morton , Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Peter Collingbourne , Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.0.5 (2021-01-21) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211221_041205_037724_BAD225C8 X-CRM114-Status: GOOD ( 12.65 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@linux.dev wrote: > From: Andrey Konovalov [...] > +static inline bool should_skip_init(gfp_t flags) > +{ > + /* Don't skip if a software KASAN mode is enabled. */ > + if (IS_ENABLED(CONFIG_KASAN_GENERIC) || > + IS_ENABLED(CONFIG_KASAN_SW_TAGS)) > + return false; > + > + /* Don't skip, if hardware tag-based KASAN is not enabled. */ > + if (!kasan_hw_tags_enabled()) > + return false; Why is the IS_ENABLED(CONFIG_KASAN_{GENERIC,SW_TAGS}) check above required? Isn't kasan_hw_tags_enabled() always false if one of those is configured? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 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 6FBB9C433F5 for ; Tue, 21 Dec 2021 12:12:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C41EB6B0071; Tue, 21 Dec 2021 07:12:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BF2186B0073; Tue, 21 Dec 2021 07:12:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AB98B6B0074; Tue, 21 Dec 2021 07:12:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0232.hostedemail.com [216.40.44.232]) by kanga.kvack.org (Postfix) with ESMTP id 9897C6B0071 for ; 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Tue, 21 Dec 2021 04:12:01 -0800 (PST) Date: Tue, 21 Dec 2021 13:11:56 +0100 From: Marco Elver To: andrey.konovalov@linux.dev Cc: Alexander Potapenko , Andrew Morton , Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Peter Collingbourne , Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: Re: [PATCH mm v4 29/39] kasan, page_alloc: allow skipping memory init for HW_TAGS Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.0.5 (2021-01-21) X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 79B2920027 X-Stat-Signature: dr1stzair4pi919u7g8yzzk3mzyxdt8g Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=rXXpkxvA; spf=pass (imf13.hostedemail.com: domain of elver@google.com designates 209.85.221.48 as permitted sender) smtp.mailfrom=elver@google.com; dmarc=pass (policy=reject) header.from=google.com X-HE-Tag: 1640088715-494517 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: On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@linux.dev wrote: > From: Andrey Konovalov [...] > +static inline bool should_skip_init(gfp_t flags) > +{ > + /* Don't skip if a software KASAN mode is enabled. */ > + if (IS_ENABLED(CONFIG_KASAN_GENERIC) || > + IS_ENABLED(CONFIG_KASAN_SW_TAGS)) > + return false; > + > + /* Don't skip, if hardware tag-based KASAN is not enabled. */ > + if (!kasan_hw_tags_enabled()) > + return false; Why is the IS_ENABLED(CONFIG_KASAN_{GENERIC,SW_TAGS}) check above required? Isn't kasan_hw_tags_enabled() always false if one of those is configured?