[linux-review:UPDATE-20200520-041207/Zhou-Yanjie/Introduce-SMP-support-for-CI20-based-on-JZ4780/20200519-224059 1/6] arch/mips/kernel/idle.c:97:6: warning: no previous prototype for function 'jz4780_smp_wait_irqoff'

[linux-review:UPDATE-20200520-041207/Zhou-Yanjie/Introduce-SMP-support-for-CI20-based-on-JZ4780/20200519-224059 1/6] arch/mips/kernel/idle.c:97:6: warning: no previous prototype for function 'jz4780_smp_wait_irqoff'

[kbuild test robot]

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tree:   https://github.com/0day-ci/linux/commits/UPDATE-20200520-041207/Zhou-Yanjie/Introduce-SMP-support-for-CI20-based-on-JZ4780/20200519-224059
head:   4fff52cd90c9406079cc6395408c8a56e7e4312d
commit: ad29da9806feb410651e7428a8ac27ab8f9104ff [1/6] MIPS: JZ4780: Introduce SMP support.
config: mips-randconfig-r023-20200520 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e6658079aca6d971b4e9d7137a3a2ecbc9c34aec)
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        git checkout ad29da9806feb410651e7428a8ac27ab8f9104ff
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> arch/mips/kernel/idle.c:97:6: warning: no previous prototype for function 'jz4780_smp_wait_irqoff' [-Wmissing-prototypes]
void jz4780_smp_wait_irqoff(void)
^
arch/mips/kernel/idle.c:97:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void jz4780_smp_wait_irqoff(void)
^
static
arch/mips/kernel/idle.c:155:13: warning: no previous prototype for function 'check_wait' [-Wmissing-prototypes]
void __init check_wait(void)
^
arch/mips/kernel/idle.c:155:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void __init check_wait(void)
^
static
2 warnings generated.

vim +/jz4780_smp_wait_irqoff +97 arch/mips/kernel/idle.c

    90	
    91	/*
    92	 * The Ingenic jz4780 SMP variant has to write back dirty cache lines before
    93	 * executing wait. The CPU & cache clock will be gated until we return from
    94	 * the wait, and if another core attempts to access data from our data cache
    95	 * during this time then it will lock up.
    96	 */
  > 97	void jz4780_smp_wait_irqoff(void)
    98	{
    99		unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP;
   100	
   101		/*
   102		 * Going to idle has a significant overhead due to the cache flush so
   103		 * try to avoid it if we'll immediately be woken again due to an IRQ.
   104		 */
   105		if (!need_resched() && !pending) {
   106			r4k_blast_dcache();
   107	
   108			__asm__(
   109			"	.set push	\n"
   110			"	.set mips3	\n"
   111			"	sync		\n"
   112			"	wait		\n"
   113			"	.set pop	\n");
   114		}
   115	
   116		local_irq_enable();
   117	}
   118	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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