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466e4d801c
Adding task_work from NMI context requires the following: - The kasan_record_aux_stack() is not NMU safe and must be avoided. - Using TWA_RESUME is NMI safe. If the NMI occurs while the CPU is in userland then it will continue in userland and not invoke the `work' callback. Add TWA_NMI_CURRENT as an additional notify mode. In this mode skip kasan and use irq_work in hardirq-mode to for needed interrupt. Set TIF_NOTIFY_RESUME within the irq_work callback due to k[ac]san instrumentation in test_and_set_bit() which does not look NMI safe in case of a report. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20240704170424.1466941-3-bigeasy@linutronix.de
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TASK_WORK_H
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#define _LINUX_TASK_WORK_H
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#include <linux/list.h>
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#include <linux/sched.h>
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typedef void (*task_work_func_t)(struct callback_head *);
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static inline void
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init_task_work(struct callback_head *twork, task_work_func_t func)
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{
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twork->func = func;
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}
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enum task_work_notify_mode {
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TWA_NONE,
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TWA_RESUME,
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TWA_SIGNAL,
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TWA_SIGNAL_NO_IPI,
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TWA_NMI_CURRENT,
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};
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static inline bool task_work_pending(struct task_struct *task)
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{
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return READ_ONCE(task->task_works);
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}
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int task_work_add(struct task_struct *task, struct callback_head *twork,
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enum task_work_notify_mode mode);
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struct callback_head *task_work_cancel_match(struct task_struct *task,
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bool (*match)(struct callback_head *, void *data), void *data);
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struct callback_head *task_work_cancel_func(struct task_struct *, task_work_func_t);
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bool task_work_cancel(struct task_struct *task, struct callback_head *cb);
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void task_work_run(void);
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static inline void exit_task_work(struct task_struct *task)
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{
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task_work_run();
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}
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#endif /* _LINUX_TASK_WORK_H */
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