From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- lib/fault-inject-usercopy.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 lib/fault-inject-usercopy.c (limited to 'lib/fault-inject-usercopy.c') diff --git a/lib/fault-inject-usercopy.c b/lib/fault-inject-usercopy.c new file mode 100644 index 000000000..75403ec50 --- /dev/null +++ b/lib/fault-inject-usercopy.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include + +static struct { + struct fault_attr attr; +} fail_usercopy = { + .attr = FAULT_ATTR_INITIALIZER, +}; + +static int __init setup_fail_usercopy(char *str) +{ + return setup_fault_attr(&fail_usercopy.attr, str); +} +__setup("fail_usercopy=", setup_fail_usercopy); + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + +static int __init fail_usercopy_debugfs(void) +{ + struct dentry *dir; + + dir = fault_create_debugfs_attr("fail_usercopy", NULL, + &fail_usercopy.attr); + + return PTR_ERR_OR_ZERO(dir); +} + +late_initcall(fail_usercopy_debugfs); + +#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ + +bool should_fail_usercopy(void) +{ + return should_fail(&fail_usercopy.attr, 1); +} +EXPORT_SYMBOL_GPL(should_fail_usercopy); -- cgit v1.3.1