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Date: Wed, 22 Sep 2021 10:22:32 +0300 From: Mike Rapoport <rppt@...nel.org> To: Christoph Hellwig <hch@....de> Cc: Catalin Marinas <catalin.marinas@....com>, David Hildenbrand <david@...hat.com>, Robin Murphy <robin.murphy@....com>, Alex Bee <knaerzche@...il.com>, Will Deacon <will@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Anshuman Khandual <anshuman.khandual@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, Linux ARM <linux-arm-kernel@...ts.infradead.org> Subject: Re: [BUG 5.14] arm64/mm: dma memory mapping fails (in some cases) On Tue, Sep 21, 2021 at 05:38:05PM +0200, Christoph Hellwig wrote: > On Tue, Sep 21, 2021 at 12:34:10PM +0300, Mike Rapoport wrote: > > > It doesn't create any new mappings. The only real issue is that it > > > does the wrong thing for RAM in a way that might not be noticed on > > > simple (x86/PC) platforms. > > > > But if the mapping request was rejected by devm_ioremap_resource() because > > of an attempt to map RAM, why we would get to dma_map_resource() at all? > > dma_map_resource takes a phys_addr_t that could come from anywhere. Right, but it's not different from, say, dma_map_page_attrs() that can get a struct page from anywhere and there is no actual memory for that struct page at all. Do you suggest add a check that that struct page is backed by memory in dma_map_page_attrs() as well? -- Sincerely yours, Mike.
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