Add support for TIF_NOTIFY_IPI on PowerPC. 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: Michael Ellerman <m...@ellerman.id.au> Cc: Nicholas Piggin <npig...@gmail.com> Cc: Christophe Leroy <christophe.le...@csgroup.eu> Cc: "Aneesh Kumar K.V" <aneesh.ku...@kernel.org> Cc: "Naveen N. Rao" <naveen.n....@linux.ibm.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: Andrew Donnellan <a...@linux.ibm.com> Cc: K Prateek Nayak <kprateek.na...@amd.com> Cc: Nicholas Miehlbradt <nicho...@linux.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-ker...@vger.kernel.org Cc: linux...@vger.kernel.org Signed-off-by: K Prateek Nayak <kprateek.na...@amd.com> --- arch/powerpc/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index bf5dde1a4114..b48db55192e0 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -103,6 +103,7 @@ void arch_setup_new_exec(void); #define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ +#define TIF_NOTIFY_IPI 9 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_SECCOMP 10 /* secure computing */ #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ #define TIF_NOERROR 12 /* Force successful syscall return */ @@ -129,6 +130,7 @@ void arch_setup_new_exec(void); #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) +#define _TIF_NOTIFY_IPI (1<<TIF_NOTIFY_IPI) #define _TIF_SECCOMP (1<<TIF_SECCOMP) #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) #define _TIF_NOERROR (1<<TIF_NOERROR) -- 2.34.1
