From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794770076; b=OjuWazEZ0MYOICGRfVlGGgVf9jIkwOiWH1kCD8XD07HMm1ul+7Ij8kyifc7AoWYOwewU lJBvHrIm+pFiJnXduZ91ffUdk3raz7Tj9bXiho7anqvoGc5PZkvQljmqBTLtNpwAp5v+L 0LwaGozhQ7Kxjq1RC4YK7ljbWkqyTFIBu4EcHMbVpuwMwwitK1wjuhEXOt2L7PeizaqAb 2nMnUc1rAa9Dx90BYfqp/GvNzQaTrtnJl42ulMpsgMEFAiqqCPi5Y08mW6kl16EB1+FOx sVP/uW/UlZuLOHNEREDIDP/SI9G+WZpBKwrFmCsqsQd+DmlD1grSAER1qI3SP68Muxg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794770076; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=bTYAm4EWSRHx/ZHXwlhFob7m+xxSKwh0NNHvPVL+4a0=; b=VZ2Vj3IVLqLZLsREd17qiC/2xY0QgLPMj6qLoZlolFoD1xMmKrVML+ESq1wWAmGBx1Tu mZL0xErfTe+5OHnVqxeBtT+wYpDc3agU+/kPXRXVfxbLEQtYqVShYTnCTOjQSNMicA2s5 upNoI7xBxXSLpkcEX9Jaxm5lUFHtOVBY6AFeT0A6OrbNEcciPUTCDmabE48yQzXZi1vTv SU6r7xnB+BsZBDl0PR5Zg4poVaQZv5FzubZFaKjFVIwt3pgdITKWX9tgdbqh8Nxkjy1/K DIaXiWsBPtac7oMfvrtQe65TVQkgoObzUjQPi4Sraef/7R9Vp2UtD5Ws0zUCal5fp/w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Zlr8cphp; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04CFB606A31F; Sun, 15 Nov 2026 19:14:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Zlr8cphp 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-Mailing-List: devicetree@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261111110738.872947-2-vdonnefort@google.com> 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.