linux-kernel - [PATCH v2] MIPS: SMP-CPS: fix build error when HOTPLUG

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Date:   Fri, 17 Feb 2023 12:07:49 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Dengcheng Zhu <dzhu@...ecomp.com>,
        Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        Sergei Shtylyov <sergei.shtylyov@...il.com>
Subject: [PATCH v2] MIPS: SMP-CPS: fix build error when HOTPLUG_CPU not set

When MIPS_CPS=y, MIPS_CPS_PM is not set, HOTPLUG_CPU is not set, and
KEXEC=y, cps_shutdown_this_cpu() attempts to call cps_pm_enter_state(),
which is not built when MIPS_CPS_PM is not set.
Conditionally execute the else branch based on CONFIG_HOTPLUG_CPU
to remove the build error.
This build failure is from a randconfig file.

mips-linux-ld: arch/mips/kernel/smp-cps.o: in function `$L162':
smp-cps.c:(.text.cps_kexec_nonboot_cpu+0x31c): undefined reference to `cps_pm_enter_state'

Fixes: 1447864bee4c ("MIPS: kexec: CPS systems to halt nonboot CPUs")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Dengcheng Zhu <dzhu@...ecomp.com>
Cc: Paul Burton <paulburton@...nel.org>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-mips@...r.kernel.org
Cc: Sergei Shtylyov <sergei.shtylyov@...il.com>
---
v2: use IS_ENABLED() instead of #ifdef-ery (Sergei)

 arch/mips/kernel/smp-cps.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff -- a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -424,9 +424,11 @@ static void cps_shutdown_this_cpu(enum c
 			wmb();
 		}
 	} else {
-		pr_debug("Gating power to core %d\n", core);
-		/* Power down the core */
-		cps_pm_enter_state(CPS_PM_POWER_GATED);
+		if (IS_ENABLED(CONFIG_HOTPLUG_CPU)) {
+			pr_debug("Gating power to core %d\n", core);
+			/* Power down the core */
+			cps_pm_enter_state(CPS_PM_POWER_GATED);
+		}
 	}
 }