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Date:   Fri, 3 May 2019 18:04:58 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Nicholas Piggin <npiggin@...il.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, tipbuild@...or.com,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [tip:sched/core 24/27] kernel/power/suspend.c:431:10: error:
 implicit declaration of function 'suspend_disable_secondary_cpus'

On Fri, May 03, 2019 at 08:34:57PM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
> head:   65874bd36e6ae3028539e989bfb5c28ad457368e
> commit: c2cb30bfceceba8a2a0d5713230a250dd6140e22 [24/27] power/suspend: Add function to disable secondaries for suspend
> config: x86_64-randconfig-l3-05031806 (attached as .config)
> compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
> reproduce:
>         git checkout c2cb30bfceceba8a2a0d5713230a250dd6140e22
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 

The below appears to fix.


--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -150,6 +150,8 @@ static inline void suspend_enable_second
 #else /* !CONFIG_PM_SLEEP_SMP */
 static inline int disable_nonboot_cpus(void) { return 0; }
 static inline void enable_nonboot_cpus(void) {}
+static inline int suspend_disable_secondary_cpus(void) { return 0; }
+static inline void suspend_enable_secondary_cpus(void) { }
 #endif /* !CONFIG_PM_SLEEP_SMP */
 
 void cpu_startup_entry(enum cpuhp_state state);

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