From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E581606A323 for ; Sun, 15 Nov 2026 19:14:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=E+l6zTwX; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Zlr8cphp DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=bTYAm4EWSRHx/ZHXwlhFob7m+xxSKwh0NNHvPVL+4a0=; b=E+l6zTwXeIaCrmdVShXmCaXt3H kBV7qVBakHHFQ+he3nD8J3OriKISGq3geMcp1jruRxepYjm/jzxP/WBpbrDitmaRV558EpYuzu68m /E5C2ZIqEQPwiHE5IjQ9Q9ELlF0x+pc54edGYpd/HpBOZYx23i4DoBVQKuFZiGavZdDKa3oepY9bs PUFuetV7bXZHpa1BXJZXD2xzk2oxeX/N3TjSkt9iT/PxbeAUwUxR13QkltYPo8kKsfFYExPEO6nsf p3CVH1V4COLZHzvZStor9Ut1bB7YJE+Yp7t1JdxLgrcikdrDZU/MujyJQy1ePzGLWaVwXiv2rmkpV gz0l5msQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xSfgT-00000000Myb-3YqA; Sun, 15 Nov 2026 19:14:37 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xSfgS-00000000MyV-08gZ for linux-arm-kernel@lists.infradead.org; Sun, 15 Nov 2026 19:14:36 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id B2ABF41664; Sun, 15 Nov 2026 19:14:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2830B1F000C4; Sun, 15 Nov 2026 19:14:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794770075; bh=bTYAm4EWSRHx/ZHXwlhFob7m+xxSKwh0NNHvPVL+4a0=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Zlr8cphpaQd3nqY4dD/M8LKmVfhEwBhg/RXnFS8Dbd42j21budIL80Fj83ujynYBi xrkpXbt/vgXXJ3zbCIgd0vytWH9UFZRo+kWYg6+zk3Dgh5sXkP6sxBNtPVRWMc7kgU 7c0cXcpkCgnk34WxtxAQP15i7VF+f+o9Op3gqEYw8sVFIZUZZKKEE/DiCEBd5NJmBL eqWix0PI/yHN1v1kle17XH0UgF/k5g+OojdNRy9zlUqHohW/kmiciG1CH3WaxOOynl GtOjVUG+IaqnqKJMnuActvv+XKVHz8jIHWFruwvUHIhP9DWwGFEUc3P4bbqJVKIINp h+RZkJC+eVaDQ== Date: Sun, 15 Nov 2026 21:14:25 +0200 From: Mike Rapoport To: Vincent Donnefort Cc: catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, m.szyprowski@samsung.com, jenswi@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mark.rutland@arm.com, robin.murphy@arm.com, hch@lst.de, ryan.roberts@arm.com, sumit.garg@kernel.org, sudeep.holla@kernel.org, ardb@kernel.org, thierry.reding@kernel.org, david@kernel.org, danielmentz@google.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev, op-tee@lists.trustedfirmware.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/8] memblock: Introduce MEMBLOCK_PTEMAP Message-ID: References: <20261111110738.872947-1-vdonnefort@google.com> <20261111110738.872947-2-vdonnefort@google.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261111110738.872947-2-vdonnefort@google.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Nov 11, 2026 at 11:07:31AM +0000, Vincent Donnefort wrote: > Keeping PTE-level mappings is interesting for arm64 as it allows > mapping/unmapping pages from the kernel direct map without the risk of > splitting blocks which, under the break-before-make rule, may trigger > page-faults the kernel can't handle. > > However, mapping the entire direct map at PTE-level is costly. So > instead, create a new memblock flag MEMBLOCK_PTEMAP to selectively apply > a PTE-level mapping. > > Signed-off-by: Vincent Donnefort Acked-by: Mike Rapoport (Microsoft) > --- > include/linux/memblock.h | 9 +++++++++ > mm/memblock.c | 39 +++++++++++++++++++++++++++++++++++++-- > 2 files changed, 46 insertions(+), 2 deletions(-) -- Sincerely yours, Mike.