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Miller" , Andreas Larsson , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Nicolas Pitre , Muchun Song , Oscar Salvador , David Hildenbrand , Konstantin Komarov , Baoquan He , Vivek Goyal , Dave Young , Tony Luck , Reinette Chatre , Dave Martin , James Morse , Alexander Viro , Christian Brauner , Jan Kara , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Uladzislau Rezki , Dmitry Vyukov , Andrey Konovalov , Jann Horn , Pedro Falcato , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-mm@kvack.org, ntfs3@lists.linux.dev, kexec@lists.infradead.org, kasan-dev@googlegroups.com Subject: Re: [PATCH v2 08/16] mm: add ability to take further action in vm_area_desc Message-ID: <20250915124259.GF1024672@nvidia.com> References: <20250915121112.GC1024672@nvidia.com> <77bbbfe8-871f-4bb3-ae8d-84dd328a1f7c@lucifer.local> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <77bbbfe8-871f-4bb3-ae8d-84dd328a1f7c@lucifer.local> X-ClientProxiedBy: YT4PR01CA0402.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:108::14) To 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 trbi0NsN 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+static inline void mmap_action_remap(struct mmap_action *action, > > > + unsigned long addr, unsigned long pfn, unsigned long size, > > > + pgprot_t pgprot) > > > +{ > > > + action->type = MMAP_REMAP_PFN; > > > + > > > + action->remap.addr = addr; > > > + action->remap.pfn = pfn; > > > + action->remap.size = size; > > > + action->remap.pgprot = pgprot; > > > +} > > > > These helpers drivers are supposed to call really should have kdocs. > > > > Especially since 'addr' is sort of ambigous. > > OK. > > > > > And I'm wondering why they don't take in the vm_area_desc? Eg shouldn't > > we be strongly discouraging using anything other than > > vma->vm_page_prot as the last argument? > > I need to abstract desc from action so custom handlers can perform > sub-actions. It's unfortunate but there we go. Why? I don't see this as required Just mark the functions as manipulating the action using the 'action' in the fuction name. > > I'd probably also have a small helper wrapper for the very common case > > of whole vma: > > > > /* Fill the entire VMA with pfns starting at pfn. Caller must have > > * already checked desc has an appropriate size */ > > mmap_action_remap_full(struct vm_area_desc *desc, unsigned long pfn) > > See above re: desc vs. action. Yet, this is the API most places actually want. > It'd be hard to know how to get the context right that'd need to be supplied to > the callback. > > In kcov's case it'd be kcov->area + an offset. Just use pgoff > So we'd need an offset parameter, the struct file *, whatever else to be > passed. Yes > And then we'll find a driver where that doesn't work and we're screwed. Bah, you keep saying that but we also may never even find one. Jason