From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C27AF30F52A; Fri, 10 Apr 2026 05:51:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775800306; cv=none; b=Kj18TsN8Vn3HGcns/ye8oYa6XpsNWijUzry8XWBezvUhs0vj/Wt6QPONjCZzEfNwaUaLU9gTDBVk+rJcne4bHxcOpJN4IKUCQvdR7V59Mof4WVVdv0tFKT/YkUuWE7R0++jR42VOH/vmua4G1Ds++HkAA9n+/U7oHcZoIFOdFs4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775800306; c=relaxed/simple; bh=RaLaicXdVd13BfmiGv2VaH4swf8eCOhEtaGCnbo0iIg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=k48TmxHHgG3uyiXhjGzdqC04+T3xsapgBn0viThYVftM+ha672VhcCp3GEeWnxrGIrdISu7G2ljgLi0+/MzplMJKnGPemI+wJix22iaNiS4e80QeaQy8huW46YEn0jgRTb0QCV2U+//gRFik1rbvZ4ImhjAFlXNYIA+mQOsYYn8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L9KhOCvw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="L9KhOCvw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79227C19421; Fri, 10 Apr 2026 05:51:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775800306; bh=RaLaicXdVd13BfmiGv2VaH4swf8eCOhEtaGCnbo0iIg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L9KhOCvwhQBtoVpNr6HLSFDBoXOpjGQuwTz5mSKRMKHFJpTYUVqBAQbaySh5U/2c6 SN44v4MFI2F7H8mEXNOvh7jTGhAh50/IkSeVwCDEPIPKv20uDiusCSdfc/BSpG9QHP YBGH0h4FMkgUZxvnpLFjQSMJHnYmJyVLRfptvRgl1MvTA0xUpcLDWOQffjysbKv2uF w+8TwLGglwIBY8Us/Km9F1tr4EGd0DKquEmHy9UcAzhCSt66wVtWFKYS/0/3m59ISp AfIgqbwJDk9Wo0Aiv4q36+2MA0J24+dk5j22Lj+MFY2PXNYq/fVP/AoUdu/hVm1lCu 8bWvlMrIwMmpQ== From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Magnus Lindholm , Matt Turner , Richard Henderson , Christophe Leroy , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Dexuan Cui , =?UTF-8?q?Krzysztof=20Ha=C5=82asa?= , Lukas Wunner , "Oliver O'Halloran" , Saurabh Singh Sengar , Shuan He , Srivatsa Bhat , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 17/20] alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range() Date: Fri, 10 Apr 2026 05:50:37 +0000 Message-ID: <20260410055040.39233-18-kwilczynski@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260410055040.39233-1-kwilczynski@kernel.org> References: <20260410055040.39233-1-kwilczynski@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently, pci_mmap_legacy_page_range() reads the legacy resource size from bus->legacy_mem->size or bus->legacy_io->size. This couples the mmap bounds check to the struct pci_bus fields that will be removed when legacy attributes are converted to static definitions. Compute the size directly from the known constants (0x100000 for memory, 0xffff for I/O) and shift by 5 bits for sparse systems. Signed-off-by: Krzysztof Wilczyński --- arch/alpha/kernel/pci-sysfs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c index 27adfe6dbd5e..2da95d965e9c 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -180,8 +180,10 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma, int sparse = has_sparse(hose, mmap_type); unsigned long res_size; - res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size : - bus->legacy_io->size; + res_size = (mmap_type == pci_mmap_mem) ? 0x100000 : 0xffff; + if (sparse) + res_size <<= 5; + if (!__legacy_mmap_fits(hose, vma, res_size, sparse)) return -EINVAL; -- 2.53.0