Introduce struct ksw_ctx to enable lockless per-task state tracking. This is required because KStackWatch operates in NMI context (via kprobe handler) where traditional locking is unsafe.
Signed-off-by: Jinchao Wang <[email protected]> --- include/linux/kstackwatch_types.h | 14 ++++++++++++++ include/linux/sched.h | 5 +++++ 2 files changed, 19 insertions(+) create mode 100644 include/linux/kstackwatch_types.h diff --git a/include/linux/kstackwatch_types.h b/include/linux/kstackwatch_types.h new file mode 100644 index 000000000000..8c4e9b0f0c6a --- /dev/null +++ b/include/linux/kstackwatch_types.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_KSTACKWATCH_TYPES_H +#define _LINUX_KSTACKWATCH_TYPES_H +#include <linux/types.h> + +struct ksw_watchpoint; +struct ksw_ctx { + struct ksw_watchpoint *wp; + ulong sp; + u16 depth; + u16 generation; +}; + +#endif /* _LINUX_KSTACKWATCH_TYPES_H */ diff --git a/include/linux/sched.h b/include/linux/sched.h index b469878de25c..db49325428b3 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -22,6 +22,7 @@ #include <linux/sem_types.h> #include <linux/shm.h> #include <linux/kmsan_types.h> +#include <linux/kstackwatch_types.h> #include <linux/mutex_types.h> #include <linux/plist_types.h> #include <linux/hrtimer_types.h> @@ -1487,6 +1488,10 @@ struct task_struct { struct kmsan_ctx kmsan_ctx; #endif +#if IS_ENABLED(CONFIG_KSTACKWATCH) + struct ksw_ctx ksw_ctx; +#endif + #if IS_ENABLED(CONFIG_KUNIT) struct kunit *kunit_test; #endif -- 2.43.0
