arch/powerpc/include/asm/hw_irq.h:293:17: sparse: sparse: context imbalance in 'serial8250_console_write' - wrong count at exit

arch/powerpc/include/asm/hw_irq.h:293:17: sparse: sparse: context imbalance in 'serial8250_console_write' - wrong count at exit

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Christophe Leroy <christophe.leroy@c-s.fr>
CC: Michael Ellerman <mpe@ellerman.id.au>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3cea11cd5e3b00d91caf0b4730194039b45c5891
commit: b020aa9d1e875c1c91b1390acdf42320e7060d84 powerpc: cleanup hw_irq.h
date:   12 months ago
:::::: branch date: 6 hours ago
:::::: commit date: 12 months ago
config: powerpc64-randconfig-s032-20201031 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-76-gf680124b-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b020aa9d1e875c1c91b1390acdf42320e7060d84
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b020aa9d1e875c1c91b1390acdf42320e7060d84
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 

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


"sparse warnings: (new ones prefixed by >>)"
   drivers/tty/serial/8250/8250_port.c: note: in included file (through include/linux/io.h, include/linux/irq.h, arch/powerpc/include/asm/hardirq.h, ...):
   arch/powerpc/include/asm/io.h:149:1: sparse: sparse: dereference of noderef expression
   arch/powerpc/include/asm/io.h:144:1: sparse: sparse: dereference of noderef expression
   arch/powerpc/include/asm/io.h:150:1: sparse: sparse: dereference of noderef expression
   arch/powerpc/include/asm/io.h:145:1: sparse: sparse: dereference of noderef expression
   drivers/tty/serial/8250/8250_port.c: note: in included file (through arch/powerpc/include/asm/irqflags.h, include/linux/irqflags.h, include/linux/spinlock.h, ...):
>> arch/powerpc/include/asm/hw_irq.h:293:17: sparse: sparse: context imbalance in 'serial8250_console_write' - wrong count at exit

vim +/serial8250_console_write +293 arch/powerpc/include/asm/hw_irq.h

df9ee29270c11db arch/powerpc/include/asm/hw_irq.h David Howells    2010-10-07  287  
df9ee29270c11db arch/powerpc/include/asm/hw_irq.h David Howells    2010-10-07  288  static inline void arch_local_irq_restore(unsigned long flags)
df9ee29270c11db arch/powerpc/include/asm/hw_irq.h David Howells    2010-10-07  289  {
b020aa9d1e875c1 arch/powerpc/include/asm/hw_irq.h Christophe Leroy 2019-08-29  290  	if (IS_ENABLED(CONFIG_BOOKE))
b020aa9d1e875c1 arch/powerpc/include/asm/hw_irq.h Christophe Leroy 2019-08-29  291  		wrtee(flags);
b020aa9d1e875c1 arch/powerpc/include/asm/hw_irq.h Christophe Leroy 2019-08-29  292  	else
df9ee29270c11db arch/powerpc/include/asm/hw_irq.h David Howells    2010-10-07 @293  		mtmsr(flags);
df9ee29270c11db arch/powerpc/include/asm/hw_irq.h David Howells    2010-10-07  294  }
^1da177e4c3f415 include/asm-ppc64/hw_irq.h        Linus Torvalds   2005-04-16  295  

:::::: The code at line 293 was first introduced by commit
:::::: df9ee29270c11dba7d0fe0b83ce47a4d8e8d2101 Fix IRQ flag handling naming

:::::: TO: David Howells <dhowells@redhat.com>
:::::: CC: David Howells <dhowells@redhat.com>

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

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