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@infradead.org>
Cc: Dengcheng Zhu <dzhu@wavecomp.com>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
Cc: Sergei Shtylyov <sergei.shtylyov@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index bcd6a944b839739750b43309f038356245dd72ff..f2df0cae1b4d9f6f4d66a95d00bf316592a6c52c 100644 (file)
--- 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 cpu_death death)
                        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);
+               }
        }
 }