On Wed, Feb 21, 2024 at 1:20 AM K Prateek Nayak <kprateek.nayak@xxxxxxx> wrote: > > Add support for TIF_NOTIFY_IPI on C-SKY. With TIF_NOTIFY_IPI, a sender > sending an IPI to an idle CPU in TIF_POLLING mode will set the > TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the > CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This > avoids spurious calls to schedule_idle() in cases where an IPI does not > necessarily wake up a task on the idle CPU. > > Cc: Guo Ren <guoren@xxxxxxxxxx> > Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx> > Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > Cc: Ingo Molnar <mingo@xxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Juri Lelli <juri.lelli@xxxxxxxxxx> > Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx> > Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx> > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> > Cc: Ben Segall <bsegall@xxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> > Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> > Cc: Valentin Schneider <vschneid@xxxxxxxxxx> > Cc: K Prateek Nayak <kprateek.nayak@xxxxxxx> > Cc: linux-csky@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: linux-pm@xxxxxxxxxxxxxxx > Signed-off-by: K Prateek Nayak <kprateek.nayak@xxxxxxx> > --- > arch/csky/include/asm/thread_info.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h > index b5ed788f0c68..9bc7a037c476 100644 > --- a/arch/csky/include/asm/thread_info.h > +++ b/arch/csky/include/asm/thread_info.h > @@ -61,6 +61,7 @@ static inline struct thread_info *current_thread_info(void) > #define TIF_SYSCALL_TRACEPOINT 5 /* syscall tracepoint instrumentation */ > #define TIF_SYSCALL_AUDIT 6 /* syscall auditing */ > #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ > +#define TIF_NOTIFY_IPI 8 /* Pending IPI on TIF_POLLLING idle CPU */ > #define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */ > #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ > #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ > @@ -73,6 +74,7 @@ static inline struct thread_info *current_thread_info(void) > #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) > #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) > #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) > +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) > #define _TIF_UPROBE (1 << TIF_UPROBE) > #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) > #define _TIF_MEMDIE (1 << TIF_MEMDIE) > -- > 2.34.1 > LGTM Acked-by: Guo Ren <guoren@xxxxxxxxxx> -- Best Regards Guo Ren
