[tglx-devel:genirq 35/56] arch/arm/kernel/smp.c:544:16: warning: variable 'irq' set but not used

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git genirq
head:   53cc7c5b089bb7f673fc14f830c4a5d665812b1d
commit: 0b1d6bdfe64f977586bbe94a054d82dd816a0aeb [35/56] ARM: smp: Use irq_desc_kstat_cpu() in show_ipi_list()
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=0b1d6bdfe64f977586bbe94a054d82dd816a0aeb
        git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
        git fetch --no-tags tglx-devel genirq
        git checkout 0b1d6bdfe64f977586bbe94a054d82dd816a0aeb
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All warnings (new ones prefixed by >>):

   arch/arm/kernel/smp.c: In function 'show_ipi_list':
>> arch/arm/kernel/smp.c:544:16: warning: variable 'irq' set but not used [-Wunused-but-set-variable]
     544 |   unsigned int irq;
         |                ^~~
   arch/arm/kernel/smp.c: At top level:
   arch/arm/kernel/smp.c:575:6: warning: no previous prototype for 'arch_irq_work_raise' [-Wmissing-prototypes]
     575 | void arch_irq_work_raise(void)
         |      ^~~~~~~~~~~~~~~~~~~
   arch/arm/kernel/smp.c:779:6: warning: no previous prototype for 'panic_smp_self_stop' [-Wmissing-prototypes]
     779 | void panic_smp_self_stop(void)
         |      ^~~~~~~~~~~~~~~~~~~
   arch/arm/kernel/smp.c:791:5: warning: no previous prototype for 'setup_profiling_timer' [-Wmissing-prototypes]
     791 | int setup_profiling_timer(unsigned int multiplier)
         |     ^~~~~~~~~~~~~~~~~~~~~

vim +/irq +544 arch/arm/kernel/smp.c

365ec7b1732732 Nicolas Pitre   2014-07-25  538  
f13cd4170ee789 Russell King    2010-11-15  539  void show_ipi_list(struct seq_file *p, int prec)
^1da177e4c3f41 Linus Torvalds  2005-04-16  540  {
4a88abd7b48e8e Russell King    2010-11-15  541  	unsigned int cpu, i;
^1da177e4c3f41 Linus Torvalds  2005-04-16  542  
4a88abd7b48e8e Russell King    2010-11-15  543  	for (i = 0; i < NR_IPI; i++) {
220387048d8598 Marc Zyngier    2020-09-25 @544  		unsigned int irq;
220387048d8598 Marc Zyngier    2020-09-25  545  
220387048d8598 Marc Zyngier    2020-09-25  546  		if (!ipi_desc[i])
220387048d8598 Marc Zyngier    2020-09-25  547  			continue;
220387048d8598 Marc Zyngier    2020-09-25  548  
220387048d8598 Marc Zyngier    2020-09-25  549  		irq = irq_desc_get_irq(ipi_desc[i]);
4a88abd7b48e8e Russell King    2010-11-15  550  		seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
^1da177e4c3f41 Linus Torvalds  2005-04-16  551  
026b7c6bf0bf04 Nicolas Pitre   2012-12-03  552  		for_each_online_cpu(cpu)
0b1d6bdfe64f97 Thomas Gleixner 2020-12-10  553  			seq_printf(p, "%10u ", irq_desc_kstat_cpu(ipi_desc[i], cpu));
^1da177e4c3f41 Linus Torvalds  2005-04-16  554  
4a88abd7b48e8e Russell King    2010-11-15  555  		seq_printf(p, " %s\n", ipi_types[i]);
4a88abd7b48e8e Russell King    2010-11-15  556  	}
^1da177e4c3f41 Linus Torvalds  2005-04-16  557  }
^1da177e4c3f41 Linus Torvalds  2005-04-16  558  

:::::: The code@line 544 was first introduced by commit
:::::: 220387048d859896ccc362c0ebf9bc1e0fa62eb9 ARM: Handle no IPI being registered in show_ipi_list()

:::::: TO: Marc Zyngier <maz@kernel.org>
:::::: CC: Marc Zyngier <maz@kernel.org>

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

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