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b=LnZg5pDEl/YbyVjvwLOdIOB1fd9xeufnLnBVYTn0yFjkwQQIcH/hNpokUZSQy81nI Spk/ZSjZ9g7PzB3NrgPGutQ6yasP/oh/KcXyhOA7G+NNoDKfyVkahcCARefSEusPPd 9ESC0k1S0n21ErvIbvmbVNonMDp9tDga79CSgtxsK+iQDTZETBcdpeon56Z51rmBuq Pd8iZquPGPJmc1tKS/jqug3yEQQV5ne1CjuIlC/S4fVHYPp5DPp3DhY+Y1/m+BphcR jB3agjkuOkEyqA4LZShAiXpXsEVdLsZxMJE4MIAH6qAINS4fzz5Y/z3aMvjcdGDBLI JQJWBfcaB9XSw== Date: Mon, 6 Jul 2026 14:35:14 +0300 From: Mike Rapoport To: Adrian =?utf-8?Q?Barna=C5=9B?= Cc: Brendan Jackman , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, Catalin Marinas , Will Deacon , Ryan Roberts , David Hildenbrand , Ard Biesheuvel , Christoph Lameter , Yang Shi , Brendan Jackman , owner-linux-mm@kvack.org Subject: Re: [RFC PATCH 3/6] arm64: mm: fix restoring linear map permissions on execmem cache clean Message-ID: References: <20260611130144.1385343-1-abarnas@google.com> <20260611130144.1385343-4-abarnas@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Stat-Signature: 3hmcpga81bgh7h1gtdce4mftqhwfc6j3 X-Rspamd-Queue-Id: 94E6420004 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1783337723-73095 X-HE-Meta: U2FsdGVkX1+mqkFno1SJuOExmm58HkAa5YIrLIojAr4eemK8hB8aDKkEBf/iHS4cgU+6ZSQHq1hKo+zq9eHYLUswyFS1s9S9ueLptG6pAdMgNwMr9/rH7DXASUoAJ6pY1mn1AJPc4zk1mk/OKIZ8c8Xj/8Y/T0T0G8BJ1Hh+3txyk9+fBjhStVEPJdvyxo5aP1R1Ac8bdbG2PnWDuNCvwTnrs/18+8M8Dkl0E982YBJjUyWTsAv15q0ffzxA+/GEtys7sQHfSRKcOYjjfGX5xYy/gj911vPbVSJiRK/vwcp7o8zzAYQMd52BkRYbFmttGxRgUVBGb9AY3WcoOhn2YhX36ms9rHdOu1099vX8RhQM5OEIbj7k6SQIOkxLChilRJNgVWac2qlaT6FuhkNLAFY3eJDyaEXm8oFYhsHD4DzRY9pCmtCtULSC748nLYPftmXt4H3qD6jPwiFFn7RVRpCezcT4M9pCKyDr4lMEvPFue+IQLPdH/3mw67ZF/X9cnPWm0+7LHbS2Tmx4sMeQlKxEsAY7bm2WvFuQMUP8XRuaWpHQTd+ND3NIsq9n5bX8HctyzvhOebwkAcOPne4dPoM1yyl7xP6O430Dzm/Uc3dDEuLdE0Xh2iXUGL/WiHWf4cY8WeJTUOASojCEX6KonDxoa0YsXHt0PI2TGQOAZYa1TyE9W20d4i94fM0GSsFMN398Lcx6R5YeMB3ZZtP/Th6VclAIcPzdXy6DKyKMfIjY/C3b9oCroI1D7fVUA5+XFgqytlnaJl9Oo9V7mLTVev0k7T5XlKE9Cz8ZpM6oP5fOKhO5QRAOIupD447yd8SD/zKjdPO1qUZLEEeMPattyGipwmQH5GOX8nKtHSvhAQbOvp7X1ewdldKygdP1NFJsp7NPKsgrpuXNTrzgXZ7gFHdq7vcCi6RpwJpbaU3LLfRjeiRS84chGDK8CKziJQAsnX9oIXBoqJXj1cNR4Eh SF5rtDJA zbkwWMeZo9dS261FqXezlIEeHWmyfvC/eBWr4s8y4UZg+UnbZ+uyUl8rrx9sFEvH0vjHXNOKyeZTl9Eq7oRsi0ekQ6bHQ5R0LZK4JH0q4oHN5v8P+TfpIAz1y7GX7iSUhsdZntUehCXwgPwqumlkmptbU7ZltOykSmaXfowbyvIMIkrKeAQb/7tNsT57F5vCcpWiDRvHgEyjQftFTNx2mGuMPuFc8RRgJwTUz5gCJGl5f7sjIHzkrHeM/hRSmC5Fgw9Mfy7n/QNR4lSxqMiVa07Bmgtb9BafDvHajwTfe1/wzyLo= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Adrian, On Wed, Jun 17, 2026 at 03:18:27PM +0000, Adrian Barnaś wrote: > > Following your suggestion, I can put together a preparatory patch series to > refactor the set_direct_map_* APIs to accept a nr_pages parameter. This > refactoring would also allow us to drop the redundant set_area_direct_map > helper. I could then rebase the rox_cache series on top of that. I've been looking at something related and I was already half way through adding numpages to set_direct_map when I remembered this conversation :) Here's what I have for now: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=direct-map/v0 This is only lightly build tested for arm64 and x86. As this is WIP, things may change there, but I hope it can save you some time with your arm64 ROX cache work. > Does this sound like a good path forward? > > Thanks, > Adrian -- Sincerely yours, Mike.