linux-kernel - arch/powerpc/include/asm/reg.h:1376:17: sparse: sparse: context imbalance in 'serial8250_console_write'

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Date:   Tue, 18 Aug 2020 12:59:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: arch/powerpc/include/asm/reg.h:1376:17: sparse: sparse: context
 imbalance in 'serial8250_console_write' - wrong count at exit

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd
commit: b020aa9d1e875c1c91b1390acdf42320e7060d84 powerpc: cleanup hw_irq.h
date:   9 months ago
config: powerpc64-randconfig-s031-20200818 (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: v0.6.2-180-g49f7e13a-dirty
        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@...el.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/processor.h, arch/powerpc/include/asm/thread_info.h, include/linux/thread_info.h, ...):
>> arch/powerpc/include/asm/reg.h:1376:17: sparse: sparse: context imbalance in 'serial8250_console_write' - wrong count at exit

# 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
vim +/serial8250_console_write +1376 arch/powerpc/include/asm/reg.h

  1359	
  1360	#define mfspr(rn)	({unsigned long rval; \
  1361				asm volatile("mfspr %0," __stringify(rn) \
  1362					: "=r" (rval)); rval;})
  1363	#ifndef mtspr
  1364	#define mtspr(rn, v)	asm volatile("mtspr " __stringify(rn) ",%0" : \
  1365					     : "r" ((unsigned long)(v)) \
  1366					     : "memory")
  1367	#endif
  1368	#define wrtspr(rn)	asm volatile("mtspr " __stringify(rn) ",0" : \
  1369					     : : "memory")
  1370	
  1371	static inline void wrtee(unsigned long val)
  1372	{
  1373		if (__builtin_constant_p(val))
  1374			asm volatile("wrteei %0" : : "i" ((val & MSR_EE) ? 1 : 0) : "memory");
  1375		else
> 1376			asm volatile("wrtee %0" : : "r" (val) : "memory");
  1377	}
  1378	

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

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