[PATCH v2 08/14] powerpc/thread_info: Introduce TIF_NOTIFY_IPI flag
K Prateek Nayak
kprateek.nayak at amd.com
Fri Jun 14 04:16:07 AEST 2024
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 <mpe at ellerman.id.au>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Christophe Leroy <christophe.leroy at csgroup.eu>
Cc: "Naveen N. Rao" <naveen.n.rao at linux.ibm.com>
Cc: Benjamin Gray <bgray at linux.ibm.com>
Cc: Andrew Donnellan <ajd at linux.ibm.com>
Cc: "Rafael J. Wysocki" <rafael at kernel.org>
Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Juri Lelli <juri.lelli at redhat.com>
Cc: Vincent Guittot <vincent.guittot at linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann at arm.com>
Cc: Steven Rostedt <rostedt at goodmis.org>
Cc: Ben Segall <bsegall at google.com>
Cc: Mel Gorman <mgorman at suse.de>
Cc: Daniel Bristot de Oliveira <bristot at redhat.com>
Cc: Valentin Schneider <vschneid at redhat.com>
Cc: K Prateek Nayak <kprateek.nayak at amd.com>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-pm at vger.kernel.org
Signed-off-by: K Prateek Nayak <kprateek.nayak at amd.com>
---
v1..v2:
o No changes.
---
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 15c5691dd218..9545e164463b 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
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