linux-kernel - [PATCH 02/17] powerpc/lpar: Reorder steal accounting calculation

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Message-ID: <20251204175405.1511340-3-srikar@linux.ibm.com>
Date: Thu,  4 Dec 2025 23:23:50 +0530
From: Srikar Dronamraju <srikar@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Peter Zijlstra <peterz@...radead.org>
Cc: Ben Segall <bsegall@...gle.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...nel.org>, Juri Lelli <juri.lelli@...hat.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Mel Gorman <mgorman@...e.de>, Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Shrikanth Hegde <sshegde@...ux.ibm.com>,
        Srikar Dronamraju <srikar@...ux.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Swapnil Sapkal <swapnil.sapkal@....com>,
        Thomas Huth <thuth@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        virtualization@...ts.linux.dev, Yicong Yang <yangyicong@...ilicon.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH 02/17] powerpc/lpar: Reorder steal accounting calculation

There is no functional change. Calculated steal could be used in the
subsequent changes. Hence reordering the function.

Signed-off-by: Srikar Dronamraju <srikar@...ux.ibm.com>
---
 arch/powerpc/platforms/pseries/lpar.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 6a415febc53b..dde12b27ba60 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -662,15 +662,20 @@ machine_device_initcall(pseries, vcpudispatch_stats_procfs_init);
 u64 pseries_paravirt_steal_clock(int cpu)
 {
 	struct lppaca *lppaca = &lppaca_of(cpu);
+	unsigned long steal;
+
+	steal = be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb));
+	steal += be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb));
 
 	/*
 	 * VPA steal time counters are reported at TB frequency. Hence do a
-	 * conversion to ns before returning
+	 * conversion to ns before using.
 	 */
-	return tb_to_ns(be64_to_cpu(READ_ONCE(lppaca->enqueue_dispatch_tb)) +
-			be64_to_cpu(READ_ONCE(lppaca->ready_enqueue_tb)));
+	steal = tb_to_ns(steal);
+
+	return steal;
 }
-#endif
+#endif /* CONFIG_PARAVIRT_TIME_ACCOUNTING */
 
 #endif /* CONFIG_PPC_SPLPAR */
 
-- 
2.43.7