arch/arm64/kernel/pi/patch-scs.c:64:29: sparse: sparse: incorrect type in assignment (different base types)

arch/arm64/kernel/pi/patch-scs.c:64:29: sparse: sparse: incorrect type in assignment (different base types)

[kernel test robot]

Hi Ard,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7cb1b466315004af98f6ba6c2546bb713ca3c237
commit: 8a6e40e1f68e9fc44497db88e0c0f21bb513c551 arm64: head: move dynamic shadow call stack patching into early C runtime
date:   10 months ago
config: arm64-randconfig-r121-20241210 (https://download.01.org/0day-ci/archive/20241211/202412110652.76eW7ZLA-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce: (https://download.01.org/0day-ci/archive/20241211/202412110652.76eW7ZLA-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/202412110652.76eW7ZLA-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   arch/arm64/kernel/pi/patch-scs.c:208:5: sparse: sparse: symbol 'scs_patch' was not declared. Should it be static?
   arch/arm64/kernel/pi/patch-scs.c:254:24: sparse: sparse: symbol 'scs_patch_vmlinux' was not declared. Should it be static?
>> arch/arm64/kernel/pi/patch-scs.c:64:29: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] @@     got restricted __le32 [usertype] @@
   arch/arm64/kernel/pi/patch-scs.c:64:29: sparse:     expected unsigned int [usertype]
   arch/arm64/kernel/pi/patch-scs.c:64:29: sparse:     got restricted __le32 [usertype]
   arch/arm64/kernel/pi/patch-scs.c:67:29: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int [usertype] @@     got restricted __le32 [usertype] @@
   arch/arm64/kernel/pi/patch-scs.c:67:29: sparse:     expected unsigned int [usertype]
   arch/arm64/kernel/pi/patch-scs.c:67:29: sparse:     got restricted __le32 [usertype]

vim +64 arch/arm64/kernel/pi/patch-scs.c

3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  57  
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  58  static void __always_inline scs_patch_loc(u64 loc)
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  59  {
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  60  	u32 insn = le32_to_cpup((void *)loc);
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  61  
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  62  	switch (insn) {
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  63  	case PACIASP:
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27 @64  		*(u32 *)loc = cpu_to_le32(SCS_PUSH);
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  65  		break;
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  66  	case AUTIASP:
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  67  		*(u32 *)loc = cpu_to_le32(SCS_POP);
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  68  		break;
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  69  	default:
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  70  		/*
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  71  		 * While the DW_CFA_negate_ra_state directive is guaranteed to
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  72  		 * appear right after a PACIASP/AUTIASP instruction, it may
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  73  		 * also appear after a DW_CFA_restore_state directive that
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  74  		 * restores a state that is only partially accurate, and is
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  75  		 * followed by DW_CFA_negate_ra_state directive to toggle the
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  76  		 * PAC bit again. So we permit other instructions here, and ignore
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  77  		 * them.
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  78  		 */
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  79  		return;
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  80  	}
8a6e40e1f68e9fc arch/arm64/kernel/pi/patch-scs.c Ard Biesheuvel 2024-02-14  81  	if (IS_ENABLED(CONFIG_ARM64_WORKAROUND_CLEAN_CACHE))
8a6e40e1f68e9fc arch/arm64/kernel/pi/patch-scs.c Ard Biesheuvel 2024-02-14  82  		asm("dc civac, %0" :: "r"(loc));
8a6e40e1f68e9fc arch/arm64/kernel/pi/patch-scs.c Ard Biesheuvel 2024-02-14  83  	else
8a6e40e1f68e9fc arch/arm64/kernel/pi/patch-scs.c Ard Biesheuvel 2024-02-14  84  		asm(ALTERNATIVE("dc cvau, %0", "nop", ARM64_HAS_CACHE_IDC)
8a6e40e1f68e9fc arch/arm64/kernel/pi/patch-scs.c Ard Biesheuvel 2024-02-14  85  		    :: "r"(loc));
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  86  }
3b619e22c4601b4 arch/arm64/kernel/patch-scs.c    Ard Biesheuvel 2022-10-27  87  

:::::: The code at line 64 was first introduced by commit
:::::: 3b619e22c4601b444ed2d6a5458271f72625ac89 arm64: implement dynamic shadow call stack for Clang

:::::: TO: Ard Biesheuvel <ardb@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>

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