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GET /api/1.1/patches/2230981/?format=api
{ "id": 2230981, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230981/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ide/patch/20260430092947.128647-1-marco.crivellari@suse.com/", "project": { "id": 13, "url": "http://patchwork.ozlabs.org/api/1.1/projects/13/?format=api", "name": "Linux IDE development", "link_name": "linux-ide", "list_id": "linux-ide.vger.kernel.org", "list_email": "linux-ide@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260430092947.128647-1-marco.crivellari@suse.com>", "date": "2026-04-30T09:29:47", "name": "[RFC] ata: libata-scsi: Move long delayed work on system_dfl_long_wq", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "6891e05a588977b9a92bac330a25707a532dda21", "submitter": { "id": 89671, "url": "http://patchwork.ozlabs.org/api/1.1/people/89671/?format=api", "name": "Marco Crivellari", "email": "marco.crivellari@suse.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ide/patch/20260430092947.128647-1-marco.crivellari@suse.com/mbox/", "series": [ { "id": 502253, "url": "http://patchwork.ozlabs.org/api/1.1/series/502253/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ide/list/?series=502253", "date": "2026-04-30T09:29:47", "name": "[RFC] ata: libata-scsi: Move long delayed work on system_dfl_long_wq", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502253/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230981/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230981/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-ide+bounces-5581-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ide@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=suse.com header.i=@suse.com header.a=rsa-sha256\n header.s=google header.b=CgJnBKEf;\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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This workqueue should be used when long works are\nexpected, but it is a per-cpu workqueue.\n\nThis is important because queue_delayed_work() queue the work using:\n\n queue_delayed_work_on(WORK_CPU_UNBOUND, ...);\n\nNote that WORK_CPU_UNBOUND = NR_CPUS.\n\nThis would end up calling __queue_delayed_work() that does:\n\n if (housekeeping_enabled(HK_TYPE_TIMER)) {\n // [....]\n } else {\n if (likely(cpu == WORK_CPU_UNBOUND))\n add_timer_global(timer);\n else\n add_timer_on(timer, cpu);\n }\n\nSo when cpu == WORK_CPU_UNBOUND the timer is global and is\nnot using a specific CPU. Later, when __queue_work() is called:\n\n if (req_cpu == WORK_CPU_UNBOUND) {\n if (wq->flags & WQ_UNBOUND)\n cpu = wq_select_unbound_cpu(raw_smp_processor_id());\n else\n cpu = raw_smp_processor_id();\n }\n\nBecause the wq is not unbound, it takes the CPU where the timer\nfired and enqueue the work on that CPU.\nThe consequence of all of this is that the work can run anywhere,\ndepending on where the timer fired.\n\nRecently, a new unbound workqueue specific for long running work has\nbeen added:\n\n c116737e972e (\"workqueue: Add system_dfl_long_wq for long unbound works\")\n\nSo change system_long_wq with system_dfl_long_wq so that the work may\nbenefit from scheduler task placement.\n\nSigned-off-by: Marco Crivellari <marco.crivellari@suse.com>\n---\n drivers/ata/libata-scsi.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)", "diff": "diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c\nindex f44612e269a4..6733f2b14521 100644\n--- a/drivers/ata/libata-scsi.c\n+++ b/drivers/ata/libata-scsi.c\n@@ -4753,7 +4753,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)\n \t\t\t \"WARNING: synchronous SCSI scan failed without making any progress, switching to async\\n\");\n \t}\n \n-\tqueue_delayed_work(system_long_wq, &ap->hotplug_task,\n+\tqueue_delayed_work(system_dfl_long_wq, &ap->hotplug_task,\n \t\t\t round_jiffies_relative(HZ));\n }\n \n", "prefixes": [ "RFC" ] }