tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e49d033bddf5b565044e2abe4241353959bc9120 commit: cf99c505cf7a5b6d3deee91e3571871f20320d31 MIPS: VZ: Only include loongson_regs.h for CPU_LOONGSON64 date: 8 months ago config: mips-randconfig-r033-20210405 (attached as .config) compiler: mips-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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cf99c505cf7a5b6d3deee91e3571871f20320d31 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout cf99c505cf7a5b6d3deee91e3571871f20320d31 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
All warnings (new ones prefixed by >>):
arch/mips/kvm/vz.c: In function '_kvm_vz_restore_htimer':
>> arch/mips/kvm/vz.c:392:10: warning: variable 'freeze_time' set but not used
>> [-Wunused-but-set-variable]
392 | ktime_t freeze_time;
| ^~~~~~~~~~~
vim +/freeze_time +392 arch/mips/kvm/vz.c
c992a4f6a9b0a3 James Hogan 2017-03-14 378
c992a4f6a9b0a3 James Hogan 2017-03-14 379 /**
f4474d50c7d483 James Hogan 2017-03-14 380 * _kvm_vz_restore_htimer() -
Restore hard timer state.
f4474d50c7d483 James Hogan 2017-03-14 381 * @vcpu: Virtual CPU.
f4474d50c7d483 James Hogan 2017-03-14 382 * @compare: CP0_Compare
register value, restored by caller.
f4474d50c7d483 James Hogan 2017-03-14 383 * @cause: CP0_Cause register to
restore.
f4474d50c7d483 James Hogan 2017-03-14 384 *
f4474d50c7d483 James Hogan 2017-03-14 385 * Restore hard timer Guest.Count &
Guest.Cause taking care to preserve the
f4474d50c7d483 James Hogan 2017-03-14 386 * value of Guest.CP0_Cause.TI
while restoring Guest.CP0_Cause.
f4474d50c7d483 James Hogan 2017-03-14 387 */
f4474d50c7d483 James Hogan 2017-03-14 388 static void
_kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
f4474d50c7d483 James Hogan 2017-03-14 389 u32
compare, u32 cause)
f4474d50c7d483 James Hogan 2017-03-14 390 {
f4474d50c7d483 James Hogan 2017-03-14 391 u32 start_count, after_count;
f4474d50c7d483 James Hogan 2017-03-14 @392 ktime_t freeze_time;
f4474d50c7d483 James Hogan 2017-03-14 393 unsigned long flags;
f4474d50c7d483 James Hogan 2017-03-14 394
f4474d50c7d483 James Hogan 2017-03-14 395 /*
f4474d50c7d483 James Hogan 2017-03-14 396 * Freeze the soft-timer and
sync the guest CP0_Count with it. We do
f4474d50c7d483 James Hogan 2017-03-14 397 * this with interrupts
disabled to avoid latency.
f4474d50c7d483 James Hogan 2017-03-14 398 */
f4474d50c7d483 James Hogan 2017-03-14 399 local_irq_save(flags);
f4474d50c7d483 James Hogan 2017-03-14 400 freeze_time =
kvm_mips_freeze_hrtimer(vcpu, &start_count);
f4474d50c7d483 James Hogan 2017-03-14 401 write_c0_gtoffset(start_count -
read_c0_count());
f4474d50c7d483 James Hogan 2017-03-14 402 local_irq_restore(flags);
f4474d50c7d483 James Hogan 2017-03-14 403
f4474d50c7d483 James Hogan 2017-03-14 404 /* restore guest CP0_Cause, as
TI may already be set */
f4474d50c7d483 James Hogan 2017-03-14 405 back_to_back_c0_hazard();
f4474d50c7d483 James Hogan 2017-03-14 406 write_gc0_cause(cause);
f4474d50c7d483 James Hogan 2017-03-14 407
f4474d50c7d483 James Hogan 2017-03-14 408 /*
f4474d50c7d483 James Hogan 2017-03-14 409 * The above sequence isn't
atomic and would result in lost timer
f4474d50c7d483 James Hogan 2017-03-14 410 * interrupts if we're not
careful. Detect if a timer interrupt is due
f4474d50c7d483 James Hogan 2017-03-14 411 * and assert it.
f4474d50c7d483 James Hogan 2017-03-14 412 */
f4474d50c7d483 James Hogan 2017-03-14 413 back_to_back_c0_hazard();
f4474d50c7d483 James Hogan 2017-03-14 414 after_count = read_gc0_count();
f4474d50c7d483 James Hogan 2017-03-14 415 if (after_count - start_count >
compare - start_count - 1)
f4474d50c7d483 James Hogan 2017-03-14 416 kvm_vz_queue_irq(vcpu,
MIPS_EXC_INT_TIMER);
f4474d50c7d483 James Hogan 2017-03-14 417 }
f4474d50c7d483 James Hogan 2017-03-14 418
:::::: The code at line 392 was first introduced by commit
:::::: f4474d50c7d483dd4432d5b0891b0bb9ad0eefc9 KVM: MIPS/VZ: Support hardware
guest timer
:::::: TO: James Hogan <james.ho...@imgtec.com>
:::::: CC: James Hogan <james.ho...@imgtec.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
.config.gz
Description: application/gzip
