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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3AA1ED6409F for ; Wed, 17 Dec 2025 09:26:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 76DB46B0005; Wed, 17 Dec 2025 04:26:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6F17A6B0089; Wed, 17 Dec 2025 04:26:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5EFE26B008A; Wed, 17 Dec 2025 04:26:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 4BED46B0005 for ; Wed, 17 Dec 2025 04:26:25 -0500 (EST) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id C98FF13BD83 for ; Wed, 17 Dec 2025 09:26:24 +0000 (UTC) X-FDA: 84228432288.22.3D90202 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf16.hostedemail.com (Postfix) with ESMTP id 0C51B180004 for ; Wed, 17 Dec 2025 09:26:22 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf16.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1765963583; a=rsa-sha256; cv=none; b=hZUwCqax25Q4AClF4KqgcpxbuczQKyUU2bgmS9kZcgZDHN29JIlAyQ3JsGG51ruS1yFrDk iSIJGS1U0xx2ly9K/BRH4m89Qado+hc7g9iSydPobmPFuBQeD7E/URvjWeSUnfMaF0hkdt 1wVnFmiMxepoK3NOcKJLXPqDJgefdWQ= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf16.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765963583; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZwihpIkffId1o87zl/G9jlo/Pzu9AzPacFtF7GHeHUE=; b=2mOfmE5HEsHysaIhXJ55pkeNNk7gwn0DmnxbnuXkTznSDGn4jECwSgyG4IsCbokkPj0RMa SEGPRead8OQTiPH5WiudhDsdVcTZH6eNqDc6v3JZ53jqyeCZ+zEsllFfill04egNcVkBAy cqRVizwc5+NwLGUyvZYVs7kV5JSEc2Q= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B975914BF; Wed, 17 Dec 2025 01:26:14 -0800 (PST) Received: from [10.57.47.3] (unknown [10.57.47.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EA6A93F762; Wed, 17 Dec 2025 01:26:14 -0800 (PST) Message-ID: Date: Wed, 17 Dec 2025 10:26:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 14/14] mm: Add basic tests for lazy_mmu To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alexander Gordeev , Andreas Larsson , Anshuman Khandual , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , David Woodhouse , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , "Ritesh Harjani (IBM)" , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Venkat Rao Bagalkote , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org References: <20251215150323.2218608-1-kevin.brodsky@arm.com> <20251215150323.2218608-15-kevin.brodsky@arm.com> <20251216201403.4647a4f9861d3122ee9e90d7@linux-foundation.org> From: Kevin Brodsky Content-Language: en-GB In-Reply-To: <20251216201403.4647a4f9861d3122ee9e90d7@linux-foundation.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 0C51B180004 X-Rspamd-Server: rspam10 X-Stat-Signature: csmrkihu7ptk1fy96h5t9qzfgr6tif6u X-HE-Tag: 1765963582-834299 X-HE-Meta: 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 s4CJDbqB NFzAT+vJ9gXTOt8G2e00wAf4xMsPhuLaUe/JapOxCR8x2/pOCWIkl9K9+RcL7QmnUIPrke5AKvQnFWDW9K6jrKgWbReSM5KWZyj4KTk+vfVOjWaFOSXlKlWoej7KrCXDZkE9c2YTyeCP1qIjB4eR6/257DlPDg/qhGYAeU+e4GGRQlwH80sq8sjkmATSovH7JixOaaEItMWoBeIE0PPQT7aqnQx7MIuIsZprUhIuh4zgTNPTfxmDV8HqwO1KM9U845YL9TcYD/N1YGDIWIhFV/WT1y2rZdVSTWJDSakCtYgxvQJbdtyfD7fu19Nqm+42Q/fX0 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: List-Subscribe: List-Unsubscribe: On 17/12/2025 05:14, Andrew Morton wrote: > On Mon, 15 Dec 2025 15:03:23 +0000 Kevin Brodsky wrote: > >> Add basic KUnit tests for the generic aspects of the lazy MMU mode: >> ensure that it appears active when it should, depending on how >> enable/disable and pause/resume pairs are nested. > I needed this for powerpc allmodconfig; > > --- a/arch/powerpc/mm/book3s64/hash_tlb.c~mm-add-basic-tests-for-lazy_mmu-fix > +++ a/arch/powerpc/mm/book3s64/hash_tlb.c > @@ -30,6 +30,7 @@ > #include > > DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch); > +EXPORT_SYMBOL_GPL(ppc64_tlb_batch); > > /* > * A linux PTE was changed and the corresponding hash table entry > @@ -154,6 +155,7 @@ void __flush_tlb_pending(struct ppc64_tl > flush_hash_range(i, local); > batch->index = 0; > } > +EXPORT_SYMBOL_GPL(__flush_tlb_pending); > > void hash__tlb_flush(struct mmu_gather *tlb) > { > _ Oh indeed I hadn't considered that arch_{enter,leave}_lazy_mmu_mode() refer to those symbols on powerpc... Maybe a bit overkill to export those just for a test module, but I'm not sure there's a good alternative. Forcing LAZY_MMU_MODE_KUNIT_TEST=y is ugly as it would also force KUNIT=y. Alternatively we could depend on !PPC, not pretty either. - Kevin