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 <[email protected]> Cc: Stefan Kristiansson <[email protected]> Cc: Stafford Horne <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Daniel Lezcano <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Juri Lelli <[email protected]> Cc: Vincent Guittot <[email protected]> Cc: Dietmar Eggemann <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Ben Segall <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Daniel Bristot de Oliveira <[email protected]> Cc: Valentin Schneider <[email protected]> Cc: K Prateek Nayak <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: K Prateek Nayak <[email protected]> --- v1..v2: o No changes. --- 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
