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Sun, 7 Sep 2025 10:25:11 -0400 (EDT) Date: Sun, 7 Sep 2025 23:25:09 +0900 From: Takashi Sakamoto To: Jason Gunthorpe Cc: Marek Szyprowski , Abdiel Janulgue , Alexander Potapenko , Alex Gaynor , Andrew Morton , Christoph Hellwig , Danilo Krummrich , iommu@lists.linux.dev, Jason Wang , Jens Axboe , Joerg Roedel , Jonathan Corbet , Juergen Gross , kasan-dev@googlegroups.com, Keith Busch , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvme@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, Madhavan Srinivasan , Masami Hiramatsu , Michael Ellerman , "Michael S. Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org Subject: Re: [PATCH v4 00/16] dma-mapping: migrate to physical address-based API Message-ID: <20250907142509.GA507575@workstation.local> Mail-Followup-To: Jason Gunthorpe , Marek Szyprowski , Abdiel Janulgue , Alexander Potapenko , Alex Gaynor , Andrew Morton , Christoph Hellwig , Danilo Krummrich , iommu@lists.linux.dev, Jason Wang , Jens Axboe , Joerg Roedel , Jonathan Corbet , Juergen Gross , kasan-dev@googlegroups.com, Keith Busch , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvme@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, Madhavan Srinivasan , Masami Hiramatsu , Michael Ellerman , "Michael S. Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250905174324.GI616306@nvidia.com> X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: BB8BC180004 X-Stat-Signature: stfxut4mh3kob3ersa7r7sktcedgmxp8 X-HE-Tag: 1757255122-8432 X-HE-Meta: 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 48s5ktvF bRNO+0uA76q0i6vhiPWdHFafPtg253Zl7/VK0cCB1b5l1eyW7sv9HRFD4U/Ye33mQxeGV43s2OZr2H4MnkEaYBmvh1pnZPIhCKaUHGCwH1kpIocjnWk2k+dMKlPeeGKKsqlrQDHamclfDKtydqCiKtYKm6zkX8Xb3hs9Vqn+BTAyeph0OV+ft802+t9hhviPp8BjxtSB0avdhCgqwUJxZZdLdofZnu2JJZ77ctuGaIyDvLaoN5F+OdmRrRIPeZQsM21V7Umv8tifl2VpxnYss13NouLBfZc35QNZlb/G3PomuUXPodlUERSaHTFB+54uIoWoR4J6t6cWxV/8HfUKUBBaWCMi6tKtOMUMH4wYOmUil53I= 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: Hi, I'm a present maintainer of Linux FireWire subsystem, and recent years have been working to modernize the subsystem. On Fri, Sep 05, 2025 at 14:43:24PM -0300, Jason Gunthorpe wrote: > There is only one user I found of alloc_pages: > > drivers/firewire/ohci.c: ctx->pages[i] = dma_alloc_pages(dev, PAGE_SIZE, &dma_addr, > > And it deliberately uses page->private: > > set_page_private(ctx->pages[i], dma_addr); > > So it is correct to use the struct page API. I've already realized it, and it is in my TODO list to use modern alternative APIs to replace it (but not yet). If you know some candidates for this purpose, it is really helpful to accomplish it. Regards Takashi Sakamoto