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GET /api/patches/2215479/?format=api
{ "id": 2215479, "url": "http://patchwork.ozlabs.org/api/patches/2215479/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260324165633.4583-11-ilpo.jarvinen@linux.intel.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260324165633.4583-11-ilpo.jarvinen@linux.intel.com>", "list_archive_url": null, "date": "2026-03-24T16:56:33", "name": "[10/10] PCI: Fix alignment calculation for resource size larger than align", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "986c32aec75d938b464e905c5de0d4b28367981b", "submitter": { "id": 83553, "url": "http://patchwork.ozlabs.org/api/people/83553/?format=api", "name": "Ilpo Järvinen", "email": "ilpo.jarvinen@linux.intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260324165633.4583-11-ilpo.jarvinen@linux.intel.com/mbox/", "series": [ { "id": 497318, "url": "http://patchwork.ozlabs.org/api/series/497318/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=497318", "date": "2026-03-24T16:56:23", "name": "PCI: Improve head free space usage", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497318/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215479/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215479/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-50939-incoming=patchwork.ozlabs.org@vger.kernel.org>", "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=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=fdPQijol;\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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a=\"78991839\"", "E=Sophos;i=\"6.23,138,1770624000\";\n d=\"scan'208\";a=\"78991839\"", "E=Sophos;i=\"6.23,138,1770624000\";\n d=\"scan'208\";a=\"254912161\"" ], "X-ExtLoop1": "1", "From": "=?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>", "To": "linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,\n Guenter Roeck <linux@roeck-us.net>, linux-alpha@vger.kernel.org,\n linux-arm-kernel@lists.infradead.org, linux-m68k@lists.linux-m68k.org,\n linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,\n linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,\n linux-sh@vger.kernel.org, Russell King <linux@armlinux.org.uk>,\n Geert Uytterhoeven <geert@linux-m68k.org>,\n Thomas Bogendoerfer <tsbogend@alpha.franken.de>,\n \"James E.J. Bottomley\" <James.Bottomley@HansenPartnership.com>,\n Helge Deller <deller@gmx.de>, Michael Ellerman <mpe@ellerman.id.au>,\n Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,\n Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>,\n \"H. Peter Anvin\" <hpa@zytor.com>, Chris Zankel <chris@zankel.net>,\n Max Filippov <jcmvbkbc@gmail.com>, Madhavan Srinivasan <maddy@linux.ibm.com>,\n Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>,\n John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>, =?utf-8?q?Ilpo_J?=\n\t=?utf-8?q?=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>,\n linux-kernel@vger.kernel.org", "Subject": "[PATCH 10/10] PCI: Fix alignment calculation for resource size larger\n than align", "Date": "Tue, 24 Mar 2026 18:56:33 +0200", "Message-Id": "<20260324165633.4583-11-ilpo.jarvinen@linux.intel.com>", "X-Mailer": "git-send-email 2.39.5", "In-Reply-To": "<20260324165633.4583-1-ilpo.jarvinen@linux.intel.com>", "References": "<20260324165633.4583-1-ilpo.jarvinen@linux.intel.com>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit" }, "content": "The commit bc75c8e50711 (\"PCI: Rewrite bridge window head alignment\nfunction\") did not use if (r_size <= align) check from pbus_size_mem()\nfor the new head alignment bookkeeping structure (aligns2[]). In some\nconfigurations, this can result in producing a gap into the bridge\nwindow which the resource larger than its alignment cannot fill.\n\nThe old alignment calculation algorithm was removed by the subsequent\ncommit 3958bf16e2fe (\"PCI: Stop over-estimating bridge window size\")\nwhich renamed the aligns2[] array leaving only aligns[] array.\n\nAdd the if (r_size <= align) check back to avoid this problem.\n\nFixes: bc75c8e50711 (\"PCI: Rewrite bridge window head alignment function\")\nCloses: https://lore.kernel.org/all/b05a6f14-979d-42c9-924c-d8408cb12ae7@roeck-us.net/\nReported-by: Guenter Roeck <linux@roeck-us.net>\nSigned-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>\n---\n drivers/pci/setup-bus.c | 9 ++++++++-\n 1 file changed, 8 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c\nindex edc0d682dcad..e5af8799c36f 100644\n--- a/drivers/pci/setup-bus.c\n+++ b/drivers/pci/setup-bus.c\n@@ -1333,7 +1333,14 @@ static void pbus_size_mem(struct pci_bus *bus, struct resource *b_res,\n \t\t\tr_size = resource_size(r);\n \t\t\tsize += max(r_size, align);\n \n-\t\t\taligns[order] += align;\n+\t\t\t/*\n+\t\t\t * If resource's size is larger than its alignment,\n+\t\t\t * some configurations result in an unwanted gap in\n+\t\t\t * the head space that the larger resource cannot\n+\t\t\t * fill.\n+\t\t\t */\n+\t\t\tif (r_size <= align)\n+\t\t\t\taligns[order] += align;\n \t\t\tif (order > max_order)\n \t\t\t\tmax_order = order;\n \t\t}\n", "prefixes": [ "10/10" ] }