From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- 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