arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   90568ecf561540fa330511e21fcd823b0c3829c6
commit: f05523aa7a1e63bfada5e222c0a57e02dbd4fcfa ARC: fpu: declutter code, move bits out into fpu.h
date:   3 weeks ago
config: arc-randconfig-a001-20200208 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout f05523aa7a1e63bfada5e222c0a57e02dbd4fcfa
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/list.h:9,
                    from include/linux/module.h:12,
                    from drivers//soundwire/bus_type.c:4:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers/irqchip/irq-tb10x.c:10:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   drivers/irqchip/irq-tb10x.c: In function 'tb10x_irq_set_type':
   drivers/irqchip/irq-tb10x.c:62:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
      62 |   flow_type = IRQ_TYPE_LEVEL_LOW;
         |   ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
   drivers/irqchip/irq-tb10x.c:63:2: note: here
      63 |  case IRQ_TYPE_LEVEL_LOW:
         |  ^~~~
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers/irqchip/irq-eznps.c:33:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   In file included from arch/arc/include/asm/arcregs.h:121,
                    from arch/arc/include/asm/irqflags-compact.h:16,
                    from arch/arc/include/asm/irqflags.h:11,
                    from include/linux/irqflags.h:16,
                    from arch/arc/include/asm/smp.h:102,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers/irqchip/irq-eznps.c:33:
   drivers/irqchip/irq-eznps.c: In function 'nps400_irq_eoi_global':
   drivers/irqchip/irq-eznps.c:80:16: error: 'CTOP_AUX_IACK' undeclared (first use in this function)
      80 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^
   drivers/irqchip/irq-eznps.c:80:16: note: each undeclared identifier is reported only once for each function it appears in
      80 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^
   drivers/irqchip/irq-eznps.c: In function 'nps400_irq_ack':
   drivers/irqchip/irq-eznps.c:92:16: error: 'CTOP_AUX_IACK' undeclared (first use in this function)
      92 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from drivers//mtd/devices/docg3.c:8:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   In file included from drivers//mtd/devices/docg3.h:343,
                    from drivers//mtd/devices/docg3.c:27:
   include/trace/define_trace.h:95:42: fatal error: ./docg3.h: No such file or directory
      95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
         |                                          ^
   compilation terminated.
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/greybus.h:14,
                    from drivers//greybus/core.c:12:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   In file included from drivers//greybus/greybus_trace.h:501,
                    from drivers//greybus/core.c:13:
   include/trace/define_trace.h:95:42: fatal error: ./greybus_trace.h: No such file or directory
      95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
         |                                          ^
   compilation terminated.
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/list.h:9,
                    from include/linux/kobject.h:19,
                    from include/linux/device.h:16,
                    from drivers//base/regmap/regmap.c:9:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   In file included from drivers//base/regmap/trace.h:258,
                    from drivers//base/regmap/regmap.c:22:
   include/trace/define_trace.h:95:42: fatal error: ./trace.h: No such file or directory
      95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
         |                                          ^
   compilation terminated.
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers//irqchip/irq-tb10x.c:10:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   drivers//irqchip/irq-tb10x.c: In function 'tb10x_irq_set_type':
   drivers//irqchip/irq-tb10x.c:62:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
      62 |   flow_type = IRQ_TYPE_LEVEL_LOW;
         |   ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
   drivers//irqchip/irq-tb10x.c:63:2: note: here
      63 |  case IRQ_TYPE_LEVEL_LOW:
         |  ^~~~
--
   In file included from arch/arc/include/asm/processor.h:17,
                    from arch/arc/include/asm/spinlock.h:10,
                    from arch/arc/include/asm/smp.h:105,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers//irqchip/irq-eznps.c:33:
>> arch/arc/include/asm/fpu.h:21:37: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
      21 | extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
         |                                     ^~~~~~~~~~~
   In file included from arch/arc/include/asm/arcregs.h:121,
                    from arch/arc/include/asm/irqflags-compact.h:16,
                    from arch/arc/include/asm/irqflags.h:11,
                    from include/linux/irqflags.h:16,
                    from arch/arc/include/asm/smp.h:102,
                    from arch/arc/include/asm/bitops.h:19,
                    from include/linux/bitops.h:26,
                    from include/linux/kernel.h:12,
                    from include/linux/interrupt.h:6,
                    from drivers//irqchip/irq-eznps.c:33:
   drivers//irqchip/irq-eznps.c: In function 'nps400_irq_eoi_global':
   drivers//irqchip/irq-eznps.c:80:16: error: 'CTOP_AUX_IACK' undeclared (first use in this function)
      80 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^
   drivers//irqchip/irq-eznps.c:80:16: note: each undeclared identifier is reported only once for each function it appears in
      80 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^
   drivers//irqchip/irq-eznps.c: In function 'nps400_irq_ack':
   drivers//irqchip/irq-eznps.c:92:16: error: 'CTOP_AUX_IACK' undeclared (first use in this function)
      92 |  write_aux_reg(CTOP_AUX_IACK, 1 << irq);
         |                ^~~~~~~~~~~~~
   include/soc/arc/aux.h:14:65: note: in definition of macro 'write_aux_reg'
      14 | #define write_aux_reg(r, v) __builtin_arc_sr((unsigned int)(v), r)
         |                                                                 ^

vim +21 arch/arc/include/asm/fpu.h

    20	
  > 21	extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
    22	

---
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