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Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Marek Szyprowski , Robin Murphy , Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , Christian =?iso-8859-1?Q?K=F6nig?= , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Catalin Marinas , Thierry Reding , devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux.dev, linaro-mm-sig@lists.linaro.org, linux-trace-kernel@vger.kernel.org, Thierry Reding , Chun Ng Subject: Re: [PATCH v3 04/11] arm64/mm: Add set_memory_device() and set_memory_normal() Message-ID: References: <20260701-tegra-vpr-v3-0-d80f7b871bb4@nvidia.com> <20260701-tegra-vpr-v3-4-d80f7b871bb4@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1D8CC4000B X-Stat-Signature: fqrhmkst8pno6tzbgxj7ijzrkdskkqsf X-HE-Tag: 1783490937-314171 X-HE-Meta: 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 Z7xiAaRZ KTDPCSGSj76nvldo/8n+NA3I0zMWumEq0sLajiZddXO4kVlI+736mMYYE3D0/2Fb4SazRnCP4crZysheYb59ifYzOAUa1run3z7sWV5IscDFnKMFVb59orCldFsBMHtsWWt5joOkbiyCdlc3suWAUZHoiZ8d0++IUd0eYG8MZTrQCfBXrANzf2McjzzTEmAjAakHVHd8IWowfGTy4vJHcA9CiEtSycT9PXWzt83EnkFHgVTOxyzuR+h4YFaoBPz+CmV40W91gwI6jp+ROBzY0laD87jsHASDaTKnE10JBAaQg92P0VyPOSsEuWEACf6ENEDjrqOk5FfWDfl7BXsJAPl5eAH2nL7C/8RCCrmAsrNZKWVMbJg7QoqJ/I29Eklql2hNSYMShPXECK0RqZVO3rakG2FWbheRdjp1ga6nUxxBpnRMsGxTOYnoTumG1IAcbjSyFd7mPu2wVuHs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jul 06, 2026 at 03:49:24PM +0200, Thierry Reding wrote: > On Fri, Jul 03, 2026 at 06:13:31PM +0100, Will Deacon wrote: > > > > > > How about if I extract a common helper and provide set_memory_p() and > > > set_memory_np() in terms of those. Those are available on x86 and > > > PowerPC as well, so fairly standard. I suppose at that point we're > > > closer to set_memory_valid(). > > > > Why not just call set_direct_map_invalid_noflush() + > > flush_tlb_kernel_range() for each page? We already have APIs for this. > > Having a "standard" helper with a fixed and documented purposed seemed > like a preferable approach for this particular case. We also may want to > make the driver that uses this buildable as a module, in which case we'd > need to export these rather low-level APIs. And then there's also the > fact that we typically call this on a rather large region of memory > (usually something like 512 MiB), so doing it page-by-page is rather > suboptimal. There are discussions about adding numpages to set_direct_map, e.g. https://lore.kernel.org/linux-mm/20260410151746.61150-2-kalyazin@amazon.com/ -- Sincerely yours, Mike.