{"id":2221676,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2221676/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260410055040.39233-18-kwilczynski@kernel.org/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.1/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260410055040.39233-18-kwilczynski@kernel.org>","date":"2026-04-10T05:50:37","name":"[17/20] alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"8beb55edb48bc5648b1dedd871063e1b2f28af02","submitter":{"id":86709,"url":"http://patchwork.ozlabs.org/api/1.1/people/86709/?format=json","name":"Krzysztof Wilczyński","email":"kwilczynski@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260410055040.39233-18-kwilczynski@kernel.org/mbox/","series":[{"id":499398,"url":"http://patchwork.ozlabs.org/api/1.1/series/499398/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=499398","date":"2026-04-10T05:50:21","name":"PCI: Convert all dynamic sysfs attributes to static","version":1,"mbox":"http://patchwork.ozlabs.org/series/499398/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221676/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221676/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=L9KhOCvw;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=UTF-8","Content-Transfer-Encoding":"8bit"},"content":"Currently, pci_mmap_legacy_page_range() reads the legacy resource\nsize from bus->legacy_mem->size or bus->legacy_io->size. This\ncouples the mmap bounds check to the struct pci_bus fields that\nwill be removed when legacy attributes are converted to static\ndefinitions.\n\nCompute the size directly from the known constants (0x100000 for\nmemory, 0xffff for I/O) and shift by 5 bits for sparse systems.\n\nSigned-off-by: Krzysztof Wilczyński \n---\n arch/alpha/kernel/pci-sysfs.c | 6 ++++--\n 1 file changed, 4 insertions(+), 2 deletions(-)","diff":"diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c\nindex 27adfe6dbd5e..2da95d965e9c 100644\n--- a/arch/alpha/kernel/pci-sysfs.c\n+++ b/arch/alpha/kernel/pci-sysfs.c\n@@ -180,8 +180,10 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,\n \tint sparse = has_sparse(hose, mmap_type);\n \tunsigned long res_size;\n \n-\tres_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :\n-\t\t\t\t\t\t bus->legacy_io->size;\n+\tres_size = (mmap_type == pci_mmap_mem) ? 0x100000 : 0xffff;\n+\tif (sparse)\n+\t\tres_size <<= 5;\n+\n \tif (!__legacy_mmap_fits(hose, vma, res_size, sparse))\n \t\treturn -EINVAL;\n \n","prefixes":["17/20"]}