[boqun:rust-sync 9/12] arch/mips/kernel/traps.c:2002:2: warning: unused variable 'nesting'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git rust-sync
head:   082cc4c201e4450ff9456c9bd093fd70d103595a
commit: 40c3e04e2248c0e5d78d23e6767a1c58d5678eac [9/12] preempt: x86: Avoid tracking NMI separately when 64BIT=y
config: mips-randconfig-r072-20260506 (https://download.01.org/0day-ci/archive/20260506/202605060744.4CMiPCaU-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
smatch: v0.5.0-9065-ge9cc34fd
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260506/202605060744.4CMiPCaU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605060744.4CMiPCaU-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/mips/kernel/traps.c:1592:17: warning: variable 'prev_state' set but not used [-Wunused-but-set-variable]
    1592 |         enum ctx_state prev_state;
         |                        ^
>> arch/mips/kernel/traps.c:2002:2: warning: unused variable 'nesting' [-Wunused-variable]
    2002 |         nmi_exit();
         |         ^~~~~~~~~~
   include/linux/hardirq.h:164:3: note: expanded from macro 'nmi_exit'
     164 |                 __nmi_exit();                                   \
         |                 ^~~~~~~~~~~~
   include/linux/hardirq.h:150:16: note: expanded from macro '__nmi_exit'
     150 |                 unsigned int nesting;                           \
         |                              ^~~~~~~
   2 warnings generated.


vim +/nesting +2002 arch/mips/kernel/traps.c

34bd92e27becdc Kevin Cernekee  2011-11-16  1990  
ff2d8b19a3a625 Joe Perches     2012-01-12  1991  void __noreturn nmi_exception_handler(struct pt_regs *regs)
^1da177e4c3f41 Linus Torvalds  2005-04-16  1992  {
83e4da1ed45441 Leonid Yegoshin 2013-10-08  1993  	char str[100];
83e4da1ed45441 Leonid Yegoshin 2013-10-08  1994  
7963b3f127a748 Petri Gynther   2015-10-19  1995  	nmi_enter();
34bd92e27becdc Kevin Cernekee  2011-11-16  1996  	raw_notifier_call_chain(&nmi_chain, 0, regs);
41c594ab65fc89 Ralf Baechle    2006-04-05  1997  	bust_spinlocks(1);
83e4da1ed45441 Leonid Yegoshin 2013-10-08  1998  	snprintf(str, 100, "CPU%d NMI taken, CP0_EPC=%lx\n",
83e4da1ed45441 Leonid Yegoshin 2013-10-08  1999  		 smp_processor_id(), regs->cp0_epc);
83e4da1ed45441 Leonid Yegoshin 2013-10-08  2000  	regs->cp0_epc = read_c0_errorepc();
83e4da1ed45441 Leonid Yegoshin 2013-10-08  2001  	die(str, regs);
7963b3f127a748 Petri Gynther   2015-10-19 @2002  	nmi_exit();
^1da177e4c3f41 Linus Torvalds  2005-04-16  2003  }
^1da177e4c3f41 Linus Torvalds  2005-04-16  2004  

:::::: The code at line 2002 was first introduced by commit
:::::: 7963b3f127a7486815bc10639630c95c2792b811 MIPS: add nmi_enter() + nmi_exit() to nmi_exception_handler()

:::::: TO: Petri Gynther <pgynther@google.com>
:::::: CC: Ralf Baechle <ralf@linux-mips.org>

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