[peterz-queue:locking/irqstate 2/6] arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable

[peterz-queue:locking/irqstate 2/6] arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/irqstate
head:   53a5109bcbaecd7ee2639bd53422eeea18b1eb2a
commit: d2706a31db9d55bf0c4c6d2c60beb02b4459805e [2/6] lockdep: Change hardirq{s_enabled,_context} to per-cpu variables
config: sparc64-allnoconfig (attached as .config)
compiler: sparc64-linux-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
        git checkout d2706a31db9d55bf0c4c6d2c60beb02b4459805e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc64 

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 <<):

In file included from arch/sparc/include/asm/percpu.h:5,
from include/linux/irqflags.h:17,
from include/asm-generic/cmpxchg-local.h:6,
from arch/sparc/include/asm/cmpxchg_64.h:111,
from arch/sparc/include/asm/cmpxchg.h:5,
from arch/sparc/include/asm/atomic_64.h:12,
from arch/sparc/include/asm/atomic.h:5,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/sparc/include/asm/bitops_64.h:52,
from arch/sparc/include/asm/bitops.h:5,
from include/linux/bitops.h:29,
from include/linux/kernel.h:12,
from arch/sparc/vdso/vclock_gettime.c:15:
>> arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable
7 | register unsigned long __local_per_cpu_offset asm("g5");
|                        ^~~~~~~~~~~~~~~~~~~~~~
arch/sparc/vdso/vclock_gettime.c:254:1: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes]
254 | __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
| ^~~~~~~~~~~~~~~~~~~~
arch/sparc/vdso/vclock_gettime.c:282:1: warning: no previous prototype for '__vdso_clock_gettime_stick' [-Wmissing-prototypes]
282 | __vdso_clock_gettime_stick(clockid_t clock, struct __kernel_old_timespec *ts)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/sparc/vdso/vclock_gettime.c:307:1: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes]
307 | __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
| ^~~~~~~~~~~~~~~~~~~
arch/sparc/vdso/vclock_gettime.c:343:1: warning: no previous prototype for '__vdso_gettimeofday_stick' [-Wmissing-prototypes]
343 | __vdso_gettimeofday_stick(struct __kernel_old_timeval *tv, struct timezone *tz)
| ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +7 arch/sparc/include/asm/percpu_64.h

f5e706ad886b6a include/asm-sparc/percpu_64.h Sam Ravnborg 2008-07-17  6  
f5e706ad886b6a include/asm-sparc/percpu_64.h Sam Ravnborg 2008-07-17 @7  register unsigned long __local_per_cpu_offset asm("g5");
f5e706ad886b6a include/asm-sparc/percpu_64.h Sam Ravnborg 2008-07-17  8  

:::::: The code at line 7 was first introduced by commit
:::::: f5e706ad886b6a5eb59637830110b09ccebf01c5 sparc: join the remaining header files

:::::: TO: Sam Ravnborg <sam@ravnborg.org>
:::::: CC: David S. Miller <davem@davemloft.net>

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

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