arch/arm/kernel/return_address.c:44:1: warning: Label 'here' is not used. There is #if in function body so the label might be used in code that is removed by the preprocessor. [unusedLabelConfiguration]

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

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CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: linux-kernel(a)vger.kernel.org
TO: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
CC: Ard Biesheuvel <ardb@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   88e6c0207623874922712e162e25d9dafd39661e
commit: c46c2c9b43f4f08f20dc06417fbf7091e4ca6d34 ARM: unwind: set frame.pc correctly for current-thread unwinding
date:   3 weeks ago
:::::: branch date: 4 hours ago
:::::: commit date: 3 weeks ago
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0

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


cppcheck possible warnings: (new ones prefixed by >>, may not real problems)

>> arch/arm/kernel/return_address.c:44:1: warning: Label 'here' is not used. There is #if in function body so the label might be used in code that is removed by the preprocessor. [unusedLabelConfiguration]
   here:
   ^
--
>> arch/arm/mm/ioremap.c:72:46: warning: Parameter 'vaddr' can be declared with const [constParameter]
   struct static_vm *find_static_vm_vaddr(void *vaddr)
                                                ^
>> arch/arm/mm/ioremap.c:85:11: warning: Uninitialized variables: svm.vm, svm.list [uninitvar]
      return svm;
             ^
   arch/arm/mm/ioremap.c:81:16: note: Assuming condition is false
     if (vm->addr > vaddr)
                  ^
   arch/arm/mm/ioremap.c:81:16: note: Assuming condition is false
     if (vm->addr > vaddr)
                  ^
   arch/arm/mm/ioremap.c:85:11: note: Uninitialized variables: svm.vm, svm.list
      return svm;
             ^
--
>> arch/arm/kernel/stacktrace.c:163:1: warning: Label 'here' is not used. There is #if in function body so the label might be used in code that is removed by the preprocessor. [unusedLabelConfiguration]
   here:
   ^
>> arch/arm/kernel/stacktrace.c:133:61: warning: Parameter 'tsk' can be declared with const [constParameter]
   static noinline void __save_stack_trace(struct task_struct *tsk,
                                                               ^
--
>> arch/arm/kernel/setup.c:744:2: warning: There is an unknown macro here somewhere. Configuration is required. If for_each_machine_desc is a macro then please configure it. [unknownMacro]
    for_each_machine_desc(p)
    ^
>> arch/arm/kernel/traps.c:497:1: warning: There is an unknown macro here somewhere. Configuration is required. If NOKPROBE_SYMBOL is a macro then please configure it. [unknownMacro]
   NOKPROBE_SYMBOL(do_undefinstr)
   ^
>> arch/arm/mm/dma-mapping.c:999:2: warning: There is an unknown macro here somewhere. Configuration is required. If for_each_sg is a macro then please configure it. [unknownMacro]
    for_each_sg(sg, s, i, j)
    ^

vim +/here +44 arch/arm/kernel/return_address.c

4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  32  
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  33  void *return_address(unsigned int level)
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  34  {
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  35  	struct return_address_data data;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  36  	struct stackframe frame;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  37  
01223f365074d6 Keun-O Park           2013-03-18  38  	data.level = level + 2;
01223f365074d6 Keun-O Park           2013-03-18  39  	data.addr = NULL;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  40  
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  41  	frame.fp = (unsigned long)__builtin_frame_address(0);
a556ee1247b997 Behan Webster         2014-09-27  42  	frame.sp = current_stack_pointer;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  43  	frame.lr = (unsigned long)__builtin_return_address(0);
c46c2c9b43f4f0 Russell King (Oracle  2022-03-09 @44) here:
c46c2c9b43f4f0 Russell King (Oracle  2022-03-09  45) 	frame.pc = (unsigned long)&&here;
fed240d9c97438 Masami Hiramatsu      2021-10-21  46  #ifdef CONFIG_KRETPROBES
fed240d9c97438 Masami Hiramatsu      2021-10-21  47  	frame.kr_cur = NULL;
fed240d9c97438 Masami Hiramatsu      2021-10-21  48  	frame.tsk = current;
fed240d9c97438 Masami Hiramatsu      2021-10-21  49  #endif
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  50  
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  51  	walk_stackframe(&frame, save_return_addr, &data);
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  52  
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  53  	if (!data.level)
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  54  		return data.addr;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  55  	else
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  56  		return NULL;
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  57  }
4bf1fa5a34aa2d Uwe Kleine-König      2009-07-21  58  

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