linux-kernel - [PATCH 5.11 394/775] powerpc/time: Enable sched clock for irqtime

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Date:   Mon,  1 Mar 2021 17:09:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pingfan Liu <kernelfans@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 394/775] powerpc/time: Enable sched clock for irqtime

From: Pingfan Liu <kernelfans@...il.com>

[ Upstream commit b709e32ef570b8b91dfbcb63cffac4324c87799f ]

When CONFIG_IRQ_TIME_ACCOUNTING and CONFIG_VIRT_CPU_ACCOUNTING_GEN, powerpc
does not enable "sched_clock_irqtime" and can not utilize irq time
accounting.

Like x86, powerpc does not use the sched_clock_register() interface. So it
needs an dedicated call to enable_sched_clock_irqtime() to enable irq time
accounting.

Fixes: 518470fe962e ("powerpc: Add HAVE_IRQ_TIME_ACCOUNTING")
Signed-off-by: Pingfan Liu <kernelfans@...il.com>
[mpe: Add fixes tag]
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/1603349479-26185-1-git-send-email-kernelfans@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/kernel/time.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 67feb35244606..83633a24ce788 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -53,6 +53,7 @@
 #include <linux/of_clk.h>
 #include <linux/suspend.h>
 #include <linux/sched/cputime.h>
+#include <linux/sched/clock.h>
 #include <linux/processor.h>
 #include <asm/trace.h>
 
@@ -1030,6 +1031,7 @@ void __init time_init(void)
 	tick_setup_hrtimer_broadcast();
 
 	of_clk_init(NULL);
+	enable_sched_clock_irqtime();
 }
 
 /*
-- 
2.27.0