[{"id":3688161,"web_url":"http://patchwork.ozlabs.org/comment/3688161/","msgid":"<20260508045452.15B72C2BCB0@smtp.kernel.org>","list_archive_url":null,"date":"2026-05-08T04:54:51","subject":"Re: [PATCH v7 15/24] alpha/PCI: Remove WARN from __pci_mmap_fits()\n and __legacy_mmap_fits()","submitter":{"id":93311,"url":"http://patchwork.ozlabs.org/api/people/93311/","name":null,"email":"sashiko-bot@kernel.org"},"content":"Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:\n- [Low] The `hose` parameter in `__legacy_mmap_fits()` is now unused.\n--\n\ncommit 7cae102d6c390202438077326b2b816098a36a13\nAuthor: Krzysztof Wilczyński \n\nalpha/PCI: Remove WARN from __pci_mmap_fits() and __legacy_mmap_fits()\n\nThis commit removes the WARN() that triggers when userspace attempts to mmap\nbeyond the BAR bounds. The mapping is still rejected, but the warning is\nsuppressed to prevent excessive logging.\n\n> diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c\n> index 8802f955256ea..a8dade7d084bc 100644\n> --- a/arch/alpha/kernel/pci-sysfs.c\n> +++ b/arch/alpha/kernel/pci-sysfs.c\n[ ... ]\n> @@ -259,7 +253,7 @@ int pci_create_resource_files(struct pci_dev *pdev)\n> \n> static int __legacy_mmap_fits(struct pci_controller *hose,\n> \t\t\t struct vm_area_struct *vma,\n> -\t\t\t unsigned long res_size, int sparse)\n> +\t\t\t unsigned long res_size)\n\nThis isn't a bug, but since the WARN() statement that used hose->index was\nremoved below, is the hose parameter still needed? It appears to be completely\nunused in the function body now.\n\n> {\n> \tunsigned long nr, start, size;\n> \n> @@ -267,13 +261,7 @@ static int __legacy_mmap_fits(struct pci_controller *hose,\n> \tstart = vma->vm_pgoff;\n> \tsize = ((res_size - 1) >> PAGE_SHIFT) + 1;\n> \n> -\tif (start < size && size - start >= nr)\n> -\t\treturn 1;\n> -\tWARN(1, \"process \\\"%s\\\" tried to map%s 0x%08lx-0x%08lx on hose %d \"\n> -\t\t\"(size 0x%08lx)\\n\",\n> -\t\tcurrent->comm, sparse ? \" sparse\" : \"\", start, start + nr,\n> -\t\those->index, size);\n> -\treturn 0;\n> +\treturn start < size && size - start >= nr;\n> }","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=ZltCzfEG;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1778216092;\n\tbh=fJx0DENx4A5ZQ/uNrVMar/h05GwEuQ8ok/CgO29jCyo=;\n\th=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date:From;\n\tb=ZltCzfEGhA98wnboNguX6yU43Dm3HdfIRbYBPA6K9bI8ojG0NB9BQfVdvv4v8Wb3K\n\t WBTgCRP9aa21A1O/5fGbRzNVVyQoOaqVhb78+2sS6LePwRv4WAoxHWeIVNku6+1AsC\n\t Xv3F7coAHXEstiKe4C4qIRj/7ZupG2z7uN/qY2FlemW7bSmvobUh7RdSEziyN157uH\n\t S3L8RGshtwlaxvRfQNEmTxJu/YZbt6U8OrWQPgvfV9y6xxZplm4RmwIfYSkHF5Mc6r\n\t Lzs6Rgj65Na6hOPu1kF6RH7nv2BE7tZeA8BjLcpm8aSJqzG533+FOZrhqkn05RIggF\n\t cXpty2/bt6TMw==","From":"sashiko-bot@kernel.org","Subject":"Re: [PATCH v7 15/24] alpha/PCI: Remove WARN from __pci_mmap_fits()\n and __legacy_mmap_fits()","Reply-To":"sashiko@lists.linux.dev","To":"=?utf-8?q?Krzysztof_Wilczy=C5=84ski?= ","Cc":"linux-pci@vger.kernel.org","In-Reply-To":"<20260508043543.217179-16-kwilczynski@kernel.org>","References":"<20260508043543.217179-16-kwilczynski@kernel.org>","Content-Type":"text/plain; charset=utf-8","Content-Transfer-Encoding":"quoted-printable","Date":"Fri, 08 May 2026 04:54:51 +0000","Message-Id":"<20260508045452.15B72C2BCB0@smtp.kernel.org>","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":""}},{"id":3688164,"web_url":"http://patchwork.ozlabs.org/comment/3688164/","msgid":"<20260508045824.GA3160093@rocinante>","list_archive_url":null,"date":"2026-05-08T05:04:57","subject":"Re: [PATCH v7 15/24] alpha/PCI: Remove WARN from __pci_mmap_fits()\n and __legacy_mmap_fits()","submitter":{"id":86709,"url":"http://patchwork.ozlabs.org/api/people/86709/","name":"Krzysztof Wilczyński","email":"kwilczynski@kernel.org"},"content":"Hello,\n\n> > static int __legacy_mmap_fits(struct pci_controller *hose,\n> > \t\t\t struct vm_area_struct *vma,\n> > -\t\t\t unsigned long res_size, int sparse)\n> > +\t\t\t unsigned long res_size)\n> \n> This isn't a bug, but since the WARN() statement that used hose->index was\n> removed below, is the hose parameter still needed? It appears to be completely\n> unused in the function body now.\n\nAh, yes, darn. Forgot to remove this one, too. A quick fix:\n\ndiff --git i/arch/alpha/kernel/pci-sysfs.c w/arch/alpha/kernel/pci-sysfs.c\nindex 7dae4999c5e3..94dbc470cd6c 100644\n--- i/arch/alpha/kernel/pci-sysfs.c\n+++ w/arch/alpha/kernel/pci-sysfs.c\n@@ -143,8 +143,7 @@ static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)\n \n /* Legacy I/O bus mapping stuff. */\n \n-static int __legacy_mmap_fits(struct pci_controller *hose,\n-\t\t\t struct vm_area_struct *vma,\n+static int __legacy_mmap_fits(struct vm_area_struct *vma,\n \t\t\t unsigned long res_size)\n {\n \tunsigned long nr, start, size;\n@@ -179,7 +178,7 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,\n \tif (sparse)\n \t\tres_size <<= 5;\n \n-\tif (!__legacy_mmap_fits(hose, vma, res_size))\n+\tif (!__legacy_mmap_fits(vma, res_size))\n \t\treturn -EINVAL;\n \n \treturn hose_mmap_page_range(hose, vma, mmap_type, sparse);\n\nWhich can be applied/squashed later.\n\nThank you!\n\n\tKrzysztof","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=ui8RYGry;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260508045452.15B72C2BCB0@smtp.kernel.org>"}},{"id":3688764,"web_url":"http://patchwork.ozlabs.org/comment/3688764/","msgid":"<20260508230758.GA30814@bhelgaas>","list_archive_url":null,"date":"2026-05-08T23:07:58","subject":"Re: [PATCH v7 15/24] alpha/PCI: Remove WARN from __pci_mmap_fits()\n and __legacy_mmap_fits()","submitter":{"id":67298,"url":"http://patchwork.ozlabs.org/api/people/67298/","name":"Bjorn Helgaas","email":"helgaas@kernel.org"},"content":"On Fri, May 08, 2026 at 02:04:57PM +0900, Krzysztof Wilczyński wrote:\n> Hello,\n> \n> > > static int __legacy_mmap_fits(struct pci_controller *hose,\n> > > \t\t\t struct vm_area_struct *vma,\n> > > -\t\t\t unsigned long res_size, int sparse)\n> > > +\t\t\t unsigned long res_size)\n> > \n> > This isn't a bug, but since the WARN() statement that used hose->index was\n> > removed below, is the hose parameter still needed? It appears to be completely\n> > unused in the function body now.\n> \n> Ah, yes, darn. Forgot to remove this one, too. A quick fix:\n\nI squashed this in, but you should double-check it because it didn't\napply cleanly.\n\n> diff --git i/arch/alpha/kernel/pci-sysfs.c w/arch/alpha/kernel/pci-sysfs.c\n> index 7dae4999c5e3..94dbc470cd6c 100644\n> --- i/arch/alpha/kernel/pci-sysfs.c\n> +++ w/arch/alpha/kernel/pci-sysfs.c\n> @@ -143,8 +143,7 @@ static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)\n> \n> /* Legacy I/O bus mapping stuff. */\n> \n> -static int __legacy_mmap_fits(struct pci_controller *hose,\n> -\t\t\t struct vm_area_struct *vma,\n> +static int __legacy_mmap_fits(struct vm_area_struct *vma,\n> \t\t\t unsigned long res_size)\n> {\n> \tunsigned long nr, start, size;\n> @@ -179,7 +178,7 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,\n> \tif (sparse)\n> \t\tres_size <<= 5;\n> \n> -\tif (!__legacy_mmap_fits(hose, vma, res_size))\n> +\tif (!__legacy_mmap_fits(vma, res_size))\n> \t\treturn -EINVAL;\n> \n> \treturn hose_mmap_page_range(hose, vma, mmap_type, sparse);\n> \n> Which can be applied/squashed later.\n> \n> Thank you!\n> \n> \tKrzysztof","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=RYaEi4xY;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.232.135.74; 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