Add support for TIF_NOTIFY_IPI on OpenRISC. 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: Jonas Bonn <jo...@southpole.se>
Cc: Stefan Kristiansson <stefan.kristians...@saunalahti.fi>
Cc: Stafford Horne <sho...@gmail.com>
Cc: "Rafael J. Wysocki" <raf...@kernel.org>
Cc: Daniel Lezcano <daniel.lezc...@linaro.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Juri Lelli <juri.le...@redhat.com>
Cc: Vincent Guittot <vincent.guit...@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggem...@arm.com>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Ben Segall <bseg...@google.com>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Daniel Bristot de Oliveira <bris...@redhat.com>
Cc: Valentin Schneider <vschn...@redhat.com>
Cc: K Prateek Nayak <kprateek.na...@amd.com>
Cc: linux-openr...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux...@vger.kernel.org
Signed-off-by: K Prateek Nayak <kprateek.na...@amd.com>
---
arch/openrisc/include/asm/thread_info.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/openrisc/include/asm/thread_info.h
b/arch/openrisc/include/asm/thread_info.h
index 4af3049c34c2..6a386703bc43 100644
--- a/arch/openrisc/include/asm/thread_info.h
+++ b/arch/openrisc/include/asm/thread_info.h
@@ -92,6 +92,7 @@ register struct thread_info *current_thread_info_reg
asm("r10");
* mode
*/
#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
+#define TIF_NOTIFY_IPI 6 /* Pending IPI on TIF_POLLLING idle CPU
*/
#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation
*/
#define TIF_RESTORE_SIGMASK 9
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
* TIF_NEED_RESCHED
@@ -104,6 +105,7 @@ register struct thread_info *current_thread_info_reg
asm("r10");
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
+#define _TIF_NOTIFY_IPI (1<<TIF_NOTIFY_IPI)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
--
2.34.1
