CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Nicholas Piggin <npiggin@gmail.com>
CC: Peter Zijlstra <peterz@infradead.org>
CC: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
CC: Thomas Gleixner <tglx@linutronix.de>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e37b12e4bb21e7c81732370b0a2b34bd196f380b
commit: 044d0d6de9f50192f9697583504a382347ee95ca lockdep: Only trace IRQ edges
date:   4 months ago
:::::: branch date: 21 hours ago
:::::: commit date: 4 months ago
config: riscv-randconfig-s031-20201220 (attached as .config)
compiler: riscv32-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: v0.6.3-184-g1b896707-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=044d0d6de9f50192f9697583504a382347ee95ca
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 044d0d6de9f50192f9697583504a382347ee95ca
        # 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=riscv 

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/gpu/drm/vkms/vkms_crtc.c: note: in included file (through include/linux/radix-tree.h, include/linux/idr.h, include/linux/kernfs.h, ...):
>> include/linux/spinlock.h:379:9: sparse: sparse: context imbalance in 'vkms_crtc_atomic_begin' - wrong count at exit
   drivers/gpu/drm/vkms/vkms_crtc.c:252:39: sparse: sparse: context imbalance in 'vkms_crtc_atomic_flush' - unexpected unlock

vim +/vkms_crtc_atomic_begin +379 include/linux/spinlock.h

c2f21ce2e31286a Thomas Gleixner 2009-12-02  376  
3490565b633c705 Denys Vlasenko  2015-07-13  377  static __always_inline void spin_lock_irq(spinlock_t *lock)
c2f21ce2e31286a Thomas Gleixner 2009-12-02  378  {
c2f21ce2e31286a Thomas Gleixner 2009-12-02 @379  	raw_spin_lock_irq(&lock->rlock);
c2f21ce2e31286a Thomas Gleixner 2009-12-02  380  }
c2f21ce2e31286a Thomas Gleixner 2009-12-02  381  

:::::: The code at line 379 was first introduced by commit
:::::: c2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 locking: Implement new raw_spinlock

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
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