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Fri, 19 Jun 2026 08:53:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781859197; bh=OD/K6TYwB6VdvSorvIdmiNjHyV31bpjL+a9MaOCS49I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WPnZvpxYsWFr3rnk5L32yO8HYtKAsK9nDXcmtPbu+MdHKCtypFslNgrP4uRW778Y6 lCj4T1rGsej83Mvin/yJOkpjbiVh+c8rZ9sZ4Z9+e5rxJwLfh1YGmjUiXW4EkhH3UU JFyD0yN8rsWHl/fvRCaay5HFYo+yil6tW/i3BoSHdp4LmeskaizOl753pBp5wb5Wk0 7qt/3uTvUbItEolF4wlZvVcEmKOuVEB425pLJPYh+dRdaH5uxnL+UElvrX1Yz8lMbl +L1vEDQCjNmMYzRrGxd9HGhoxIM2bf79ZICu4ZNbV85IdQV0ZJ9ZnBbyQUUDAtcXJ+ GCGmYY+W84Vgg== From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Alex Williamson , 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 v8 20/25] alpha/PCI: Compute legacy size in pci_mmap_legacy_page_range() Date: Fri, 19 Jun 2026 08:51:55 +0000 Message-ID: <20260619085200.3729431-21-kwilczynski@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260619085200.3729431-1-kwilczynski@kernel.org> References: <20260619085200.3729431-1-kwilczynski@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list 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 using PCI_LEGACY_MEM_SIZE (0x100000) and PCI_LEGACY_IO_SIZE (0xffff) macros, and shift by 5 bits for sparse systems. Tested-by: Magnus Lindholm Tested-by: Shivaprasad G Bhat Acked-by: Magnus Lindholm Signed-off-by: Krzysztof Wilczyński --- arch/alpha/kernel/pci-sysfs.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c index ae448a2e40c5..74c9145e0253 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -173,8 +173,11 @@ 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) ? PCI_LEGACY_MEM_SIZE : + PCI_LEGACY_IO_SIZE; + if (sparse) + res_size <<= 5; + if (!__legacy_mmap_fits(vma, res_size)) return -EINVAL; -- 2.54.0