[mark:testing/v7.0-rc5 2/2] arch/arm64/kernel/process.c:704:31: error: expected readable system register

[mark:testing/v7.0-rc5 2/2] arch/arm64/kernel/process.c:704:31: error: expected readable system register

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git testing/v7.0-rc5
head:   53a91f2f4a3dd7bb262b669780eea2fff13f4e37
commit: 53a91f2f4a3dd7bb262b669780eea2fff13f4e37 [2/2] HACK: arm64: Check CPU state at task-switch time
config: arm64-randconfig-001-20260325 (https://download.01.org/0day-ci/archive/20260325/202603251009.SO6yPDZX-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 054e11d1a17e5ba88bb1a8ef32fad3346e80b186)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260325/202603251009.SO6yPDZX-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/202603251009.SO6yPDZX-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/arm64/kernel/process.c:704:31: error: expected readable system register
     704 |         if (system_uses_hw_pan() && !read_sysreg(PAN))
         |                                      ^
   arch/arm64/include/asm/sysreg.h:1164:15: note: expanded from macro 'read_sysreg'
    1164 |         asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \
         |                      ^
   <inline asm>:1:10: note: instantiated into assembly here
       1 |         mrs x8, PAN
         |                 ^
   1 error generated.


vim +704 arch/arm64/kernel/process.c

   701	
   702	static inline void debug_switch_state(void)
   703	{
 > 704		if (system_uses_hw_pan() && !read_sysreg(PAN))
   705			WARN_ONCE(1, "PSTATE.PAN clear unexpectedly at task-switch\n");
   706	
   707		if (system_uses_irq_prio_masking()) {
   708			unsigned long daif_expected = 0;
   709			unsigned long daif_actual = read_sysreg(daif);
   710			unsigned long pmr_expected = GIC_PRIO_IRQOFF;
   711			unsigned long pmr_actual = read_sysreg_s(SYS_ICC_PMR_EL1);
   712	
   713			WARN_ONCE(daif_actual != daif_expected ||
   714				  pmr_actual != pmr_expected,
   715				  "Unexpected DAIF + PMR: 0x%lx + 0x%lx (expected 0x%lx + 0x%lx)\n",
   716				  daif_actual, pmr_actual,
   717				  daif_expected, pmr_expected);
   718		} else {
   719			unsigned long daif_expected = DAIF_PROCCTX_NOIRQ;
   720			unsigned long daif_actual = read_sysreg(daif);
   721	
   722			WARN_ONCE(daif_actual != daif_expected,
   723				  "Unexpected DAIF value: 0x%lx (expected 0x%lx)\n",
   724				  daif_actual, daif_expected);
   725		}
   726	}
   727	

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