6.6-stable review patch. If anyone has any objections, please let me know.
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From: Gabriele Monaco gmonaco@redhat.com
commit 8259cb14a70680553d5e82d65d1302fe589e9b39 upstream.
RV per-task monitors are implemented through a monitor structure available for each task_struct. This structure is reset every time the monitor is (re-)started, to avoid inconsistencies if the monitor was activated previously. To do so, we reset the monitor on all threads using the macro for_each_process_thread. However, this macro excludes the idle tasks on each CPU. Idle tasks could be considered tasks on their own right and it should be up to the model whether to ignore them or not.
Reset monitors also on the idle tasks for each present CPU whenever we reset all per-task monitors.
Cc: stable@vger.kernel.org Cc: Juri Lelli juri.lelli@redhat.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Peter Zijlstra peterz@infradead.org Cc: John Kacur jkacur@redhat.com Link: https://lore.kernel.org/20250115151547.605750-2-gmonaco@redhat.com Fixes: 792575348ff7 ("rv/include: Add deterministic automata monitor definition via C macros") Signed-off-by: Gabriele Monaco gmonaco@redhat.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/rv/da_monitor.h | 4 ++++ 1 file changed, 4 insertions(+)
--- a/include/rv/da_monitor.h +++ b/include/rv/da_monitor.h @@ -14,6 +14,7 @@ #include <rv/automata.h> #include <linux/rv.h> #include <linux/bug.h> +#include <linux/sched.h>
#ifdef CONFIG_RV_REACTORS
@@ -324,10 +325,13 @@ static inline struct da_monitor *da_get_ static void da_monitor_reset_all_##name(void) \ { \ struct task_struct *g, *p; \ + int cpu; \ \ read_lock(&tasklist_lock); \ for_each_process_thread(g, p) \ da_monitor_reset_##name(da_get_monitor_##name(p)); \ + for_each_present_cpu(cpu) \ + da_monitor_reset_##name(da_get_monitor_##name(idle_task(cpu))); \ read_unlock(&tasklist_lock); \ } \ \