{"id":2233124,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2233124/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260505173029.2718246-6-terry.bowman@amd.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.2/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,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260505173029.2718246-6-terry.bowman@amd.com>","list_archive_url":null,"date":"2026-05-05T17:30:23","name":"[v17,05/11] cxl: Limit CXL-CPER kfifo registration functions scope","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"81bf836d5a298f86136556566fbbb8ebc78451f3","submitter":{"id":82124,"url":"http://patchwork.ozlabs.org/api/1.2/people/82124/?format=json","name":"Bowman, Terry","email":"Terry.Bowman@amd.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260505173029.2718246-6-terry.bowman@amd.com/mbox/","series":[{"id":502875,"url":"http://patchwork.ozlabs.org/api/1.2/series/502875/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=502875","date":"2026-05-05T17:30:19","name":"Enable CXL PCIe Port Protocol Error handling and logging","version":17,"mbox":"http://patchwork.ozlabs.org/series/502875/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2233124/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2233124/checks/","tags":{},"related":[],"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 (1024-bit key;\n unprotected) header.d=amd.com header.i=@amd.com header.a=rsa-sha256\n header.s=selector1 header.b=QhvfOfqk;\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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helo=satlexmb07.amd.com; pr=C","From":"Terry Bowman ","To":", , ,\n\t, , ,\n\t, ,\n\t, ,\n\t, ,\n\t, ,\n\t, ,\n\t, , ,\n\t, ,\n\t","CC":", ,\n\t, ,\n\t","Subject":"[PATCH v17 05/11] cxl: Limit CXL-CPER kfifo registration functions\n scope","Date":"Tue, 5 May 2026 12:30:23 -0500","Message-ID":"<20260505173029.2718246-6-terry.bowman@amd.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260505173029.2718246-1-terry.bowman@amd.com>","References":"<20260505173029.2718246-1-terry.bowman@amd.com>","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"7bit","Content-Type":"text/plain","X-ClientProxiedBy":"satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com\n (10.181.42.216)","X-EOPAttributedMessage":"0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"DM2PEPF00003FC8:EE_|IA1PR12MB8405:EE_","X-MS-Office365-Filtering-Correlation-Id":"8483fcc4-f35c-4a5f-4b29-08deaacc2db6","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"\n\tBCL:0;ARA:13230040|1800799024|376014|82310400026|7416014|36860700016|921020|56012099003|22082099003|18002099003;","X-Microsoft-Antispam-Message-Info":"\n\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","X-Forefront-Antispam-Report":"\n\tCIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(376014)(82310400026)(7416014)(36860700016)(921020)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101;","X-MS-Exchange-AntiSpam-MessageData-ChunkCount":"1","X-MS-Exchange-AntiSpam-MessageData-0":"\n\tJ6K12YN6jQzE5WGKCW+i27X9iVhEhY2eISEqfbAr5jXy8ogRUATZHN8fx+VqPelPIhV1z8SW1PDMgZSo+m7XqWZuFts+WnpNfeRqee495/oEv0le64NNR9FO2eccOKg3Gv3sUTZVJ1Ah8J75f8EcsBY2O8gO/DK4wLzYa/VQFpkl7FpWkuXL/3AU7IQ63+CvvWAri+/qVbsi2kCmjeBp5pzYgdaIwRWfGgxFvvXFKWgPaNpUQ/tawXXLlIT2SmB+JyTCDto5jKpVg8ikk2CiIIfdg4b3kexoMhDcd7F+r3PJ+w1Fu+5DuvCwH2inQkYy+OFpfKk6PerJqDIiqgcAmzE5/N3C2SUSKDwNtPYI3z48IyMbAnc+PlykzxQTe0iYUkYFNeBtSa2rb0wZk/6DFY2JJRTaot0UHEL7fyWRdYUM2hnugzbpwyo5SQ12Yx0s","X-OriginatorOrg":"amd.com","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"05 May 2026 17:31:44.9220\n (UTC)","X-MS-Exchange-CrossTenant-Network-Message-Id":"\n 8483fcc4-f35c-4a5f-4b29-08deaacc2db6","X-MS-Exchange-CrossTenant-Id":"3dd8961f-e488-4e60-8e11-a82d994e183d","X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp":"\n TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n\tDM2PEPF00003FC8.namprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"IA1PR12MB8405"},"content":"From: Dan Williams \n\nSome CPER functions used by CXL drivers are exported using the\nEXPORT_SYMBOL_NS_GPL(fn, ns) macro. This doesn't provide compile time\nenforcement or visibility of the consumers.\n\nThis can be improved by using EXPORT_SYMBOL_FOR_MODULES() instead.\nEXPORT_SYMBOL_FOR_MODULES() explicitly names the modules that can access\nthe function. This provides more precise control and visibility of symbol\nexposure than the namespace macro. It also provides compile time checking.\n\nTo improve control and clarity, update cxl_cper_register_prot_err_work(),\ncxl_cper_unregister_prot_err_work(), and cxl_cper_prot_err_kfifo_get()\nto use EXPORT_SYMBOL_FOR_MODULES(). Also, update the register and unregister\nfunctions to return void type.\n\nUpdate the CPER kfifo unregister to cancel work while using\nsynchronization.\n\nCo-developed-by: Terry Bowman \nSigned-off-by: Terry Bowman \nSigned-off-by: Dan Williams \n\n---\n\nChanges in v16->v17:\n- Split from v16 02/10 (\"Update unregistration for AER-CXL and\n CPER-CXL kfifos\"); AER-CXL half folded into v17 01/10.\n- Convert exports to EXPORT_SYMBOL_FOR_MODULES(\"cxl_core\").\n- Change register/unregister return type from int to void.\n- Drop work_struct argument from cxl_cper_unregister_prot_err_work();\n it now cancels its own work.\n- Remove now-redundant cancel_work_sync() from cxl_ras_exit().\n- Add WARN_ONCE() in cxl_cper_register_prot_err_work() for\n double-registration.\n---\n drivers/acpi/apei/ghes.c | 27 ++++++++++++++-------------\n drivers/cxl/core/ras.c | 6 +++---\n include/cxl/event.h | 10 ++++------\n 3 files changed, 21 insertions(+), 22 deletions(-)","diff":"diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c\nindex 3236a3ce79d6..dd0a073af93c 100644\n--- a/drivers/acpi/apei/ghes.c\n+++ b/drivers/acpi/apei/ghes.c\n@@ -778,33 +778,34 @@ static void cxl_cper_post_prot_err(struct cxl_cper_sec_prot_err *prot_err,\n #endif\n }\n \n-int cxl_cper_register_prot_err_work(struct work_struct *work)\n+void cxl_cper_register_prot_err_work(struct work_struct *work)\n {\n-\tif (cxl_cper_prot_err_work)\n-\t\treturn -EINVAL;\n-\n \tguard(spinlock)(&cxl_cper_prot_err_work_lock);\n+\tWARN_ONCE(cxl_cper_prot_err_work,\n+\t\t \"CPER-CXL kfifo consumer already registered\\n\");\n \tcxl_cper_prot_err_work = work;\n-\treturn 0;\n }\n-EXPORT_SYMBOL_NS_GPL(cxl_cper_register_prot_err_work, \"CXL\");\n+EXPORT_SYMBOL_FOR_MODULES(cxl_cper_register_prot_err_work, \"cxl_core\");\n \n-int cxl_cper_unregister_prot_err_work(struct work_struct *work)\n+void cxl_cper_unregister_prot_err_work(void)\n {\n-\tif (cxl_cper_prot_err_work != work)\n-\t\treturn -EINVAL;\n+\tstruct work_struct *work;\n \n-\tguard(spinlock)(&cxl_cper_prot_err_work_lock);\n+\tspin_lock(&cxl_cper_prot_err_work_lock);\n+\twork = cxl_cper_prot_err_work;\n \tcxl_cper_prot_err_work = NULL;\n-\treturn 0;\n+\tspin_unlock(&cxl_cper_prot_err_work_lock);\n+\n+\tif (work)\n+\t\tcancel_work_sync(work);\n }\n-EXPORT_SYMBOL_NS_GPL(cxl_cper_unregister_prot_err_work, \"CXL\");\n+EXPORT_SYMBOL_FOR_MODULES(cxl_cper_unregister_prot_err_work, \"cxl_core\");\n \n int cxl_cper_prot_err_kfifo_get(struct cxl_cper_prot_err_work_data *wd)\n {\n \treturn kfifo_get(&cxl_cper_prot_err_fifo, wd);\n }\n-EXPORT_SYMBOL_NS_GPL(cxl_cper_prot_err_kfifo_get, \"CXL\");\n+EXPORT_SYMBOL_FOR_MODULES(cxl_cper_prot_err_kfifo_get, \"cxl_core\");\n \n /* Room for 8 entries for each of the 4 event log queues */\n #define CXL_CPER_FIFO_DEPTH 32\ndiff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c\nindex 56611da8357a..9193dac4e507 100644\n--- a/drivers/cxl/core/ras.c\n+++ b/drivers/cxl/core/ras.c\n@@ -68,13 +68,13 @@ static DECLARE_WORK(cxl_cper_prot_err_work, cxl_cper_prot_err_work_fn);\n \n int cxl_ras_init(void)\n {\n-\treturn cxl_cper_register_prot_err_work(&cxl_cper_prot_err_work);\n+\tcxl_cper_register_prot_err_work(&cxl_cper_prot_err_work);\n+\treturn 0;\n }\n \n void cxl_ras_exit(void)\n {\n-\tcxl_cper_unregister_prot_err_work(&cxl_cper_prot_err_work);\n-\tcancel_work_sync(&cxl_cper_prot_err_work);\n+\tcxl_cper_unregister_prot_err_work();\n }\n \n static void cxl_dport_map_ras(struct cxl_dport *dport)\ndiff --git a/include/cxl/event.h b/include/cxl/event.h\nindex ff97fea718d2..51acedb0d683 100644\n--- a/include/cxl/event.h\n+++ b/include/cxl/event.h\n@@ -289,8 +289,8 @@ struct cxl_cper_prot_err_work_data {\n int cxl_cper_register_work(struct work_struct *work);\n int cxl_cper_unregister_work(struct work_struct *work);\n int cxl_cper_kfifo_get(struct cxl_cper_work_data *wd);\n-int cxl_cper_register_prot_err_work(struct work_struct *work);\n-int cxl_cper_unregister_prot_err_work(struct work_struct *work);\n+void cxl_cper_register_prot_err_work(struct work_struct *work);\n+void cxl_cper_unregister_prot_err_work(void);\n int cxl_cper_prot_err_kfifo_get(struct cxl_cper_prot_err_work_data *wd);\n #else\n static inline int cxl_cper_register_work(struct work_struct *work)\n@@ -306,13 +306,11 @@ static inline int cxl_cper_kfifo_get(struct cxl_cper_work_data *wd)\n {\n \treturn 0;\n }\n-static inline int cxl_cper_register_prot_err_work(struct work_struct *work)\n+static inline void cxl_cper_register_prot_err_work(struct work_struct *work)\n {\n-\treturn 0;\n }\n-static inline int cxl_cper_unregister_prot_err_work(struct work_struct *work)\n+static inline void cxl_cper_unregister_prot_err_work(void)\n {\n-\treturn 0;\n }\n static inline int cxl_cper_prot_err_kfifo_get(struct cxl_cper_prot_err_work_data *wd)\n {\n","prefixes":["v17","05/11"]}