linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android-gs-raviole-5.10-android12-qpr1-d 1711/8858] arch/arm64/mm/fault.c:492:31: sparse: sparse: incorrect type in return expression (different base types)

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Message-ID: <202202080945.Pweq3bsl-lkp@intel.com>
Date:   Tue, 8 Feb 2022 09:08:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mahendran Ganesh <opensource.ganesh@...il.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Charan Teja Reddy <charante@...eaurora.org>
Subject: [ammarfaizi2-block:google/android/kernel/common/android-gs-raviole-5.10-android12-qpr1-d
 1711/8858] arch/arm64/mm/fault.c:492:31: sparse: sparse: incorrect type in
 return expression (different base types)

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android-gs-raviole-5.10-android12-qpr1-d
head:   9771767708df4fcf51cd1642e041c804a86e740c
commit: 2fd69fa6bcab984b56ccfd4860b10f11f1966bed [1711/8858] FROMLIST: arm64/mm: add speculative page fault
config: arm64-randconfig-s031-20220207 (https://download.01.org/0day-ci/archive/20220208/202202080945.Pweq3bsl-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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: v0.6.4-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/2fd69fa6bcab984b56ccfd4860b10f11f1966bed
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android-gs-raviole-5.10-android12-qpr1-d
        git checkout 2fd69fa6bcab984b56ccfd4860b10f11f1966bed
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/mm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> arch/arm64/mm/fault.c:492:31: sparse: sparse: incorrect type in return expression (different base types) @@     expected int @@     got restricted vm_fault_t @@
   arch/arm64/mm/fault.c:492:31: sparse:     expected int
   arch/arm64/mm/fault.c:492:31: sparse:     got restricted vm_fault_t
   arch/arm64/mm/fault.c:561:15: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted vm_fault_t [usertype] fault @@     got int @@
   arch/arm64/mm/fault.c:561:15: sparse:     expected restricted vm_fault_t [usertype] fault
   arch/arm64/mm/fault.c:561:15: sparse:     got int
   arch/arm64/mm/fault.c:591:15: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted vm_fault_t [usertype] fault @@     got int @@
   arch/arm64/mm/fault.c:591:15: sparse:     expected restricted vm_fault_t [usertype] fault
   arch/arm64/mm/fault.c:591:15: sparse:     got int
   arch/arm64/mm/fault.c:620:13: sparse: sparse: restricted vm_fault_t degrades to integer
   arch/arm64/mm/fault.c:620:13: sparse: sparse: restricted vm_fault_t degrades to integer
   arch/arm64/mm/fault.c:665:39: sparse: sparse: restricted vm_fault_t degrades to integer

vim +492 arch/arm64/mm/fault.c

1d18c47c735e8a Catalin Marinas   2012-03-05  471  
1d18c47c735e8a Catalin Marinas   2012-03-05  472  	if (unlikely(!vma))
4745224b45097d Anshuman Khandual 2019-06-07  473  		return VM_FAULT_BADMAP;
1d18c47c735e8a Catalin Marinas   2012-03-05  474  
1d18c47c735e8a Catalin Marinas   2012-03-05  475  	/*
1d18c47c735e8a Catalin Marinas   2012-03-05  476  	 * Ok, we have a good vm_area for this memory access, so we can handle
1d18c47c735e8a Catalin Marinas   2012-03-05  477  	 * it.
1d18c47c735e8a Catalin Marinas   2012-03-05  478  	 */
4745224b45097d Anshuman Khandual 2019-06-07  479  	if (unlikely(vma->vm_start > addr)) {
4745224b45097d Anshuman Khandual 2019-06-07  480  		if (!(vma->vm_flags & VM_GROWSDOWN))
4745224b45097d Anshuman Khandual 2019-06-07  481  			return VM_FAULT_BADMAP;
4745224b45097d Anshuman Khandual 2019-06-07  482  		if (expand_stack(vma, addr))
4745224b45097d Anshuman Khandual 2019-06-07  483  			return VM_FAULT_BADMAP;
4745224b45097d Anshuman Khandual 2019-06-07  484  	}
4745224b45097d Anshuman Khandual 2019-06-07  485  
db6f41063cbdb5 Will Deacon       2013-07-19  486  	/*
db6f41063cbdb5 Will Deacon       2013-07-19  487  	 * Check that the permissions on the VMA allow for the fault which
cab15ce604e550 Catalin Marinas   2016-08-11  488  	 * occurred.
db6f41063cbdb5 Will Deacon       2013-07-19  489  	 */
4745224b45097d Anshuman Khandual 2019-06-07  490  	if (!(vma->vm_flags & vm_flags))
4745224b45097d Anshuman Khandual 2019-06-07  491  		return VM_FAULT_BADACCESS;
6a1bb025d28e10 Peter Xu          2020-08-11 @492  	return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags, regs);
1d18c47c735e8a Catalin Marinas   2012-03-05  493  }
1d18c47c735e8a Catalin Marinas   2012-03-05  494  

:::::: The code at line 492 was first introduced by commit
:::::: 6a1bb025d28e1026fead73b7b33e2dfccba3f4d2 mm/arm64: use general page fault accounting

:::::: TO: Peter Xu <peterx@...hat.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org