arch/arm64/include/asm/mman.h:53 arch_vm_get_page_prot() warn: bitwise AND condition is false here

From: kernel test robot <lkp@intel.com>
To: kbuild@lists.01.org
Subject: arch/arm64/include/asm/mman.h:53 arch_vm_get_page_prot() warn: bitwise AND condition is false here
Date: Mon, 16 Aug 2021 03:12:16 +0800	[thread overview]
Message-ID: <202108160308.VlV871XY-lkp@intel.com> (raw)

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Catalin Marinas <catalin.marinas@arm.com>
CC: Vincenzo Frascino <vincenzo.frascino@arm.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0aa78d17099b04fd9d36fe338af48ad6fe2d7fca
commit: 9f3419315f3cdc41a7318e4d50ba18a592b30c8c arm64: mte: Add PROT_MTE support to mmap() and mprotect()
date:   12 months ago
:::::: branch date: 13 hours ago
:::::: commit date: 12 months ago
config: arm64-randconfig-m031-20210814 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
arch/arm64/include/asm/mman.h:53 arch_vm_get_page_prot() warn: bitwise AND condition is false here
arch/arm64/include/asm/mman.h:53 arch_vm_get_page_prot() warn: bitwise AND condition is false here

vim +53 arch/arm64/include/asm/mman.h

9f3419315f3cdc Catalin Marinas 2019-11-27  37  
8ef8f360cf30be Dave Martin     2020-03-16  38  static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
8ef8f360cf30be Dave Martin     2020-03-16  39  {
9f3419315f3cdc Catalin Marinas 2019-11-27  40  	pteval_t prot = 0;
9f3419315f3cdc Catalin Marinas 2019-11-27  41  
9f3419315f3cdc Catalin Marinas 2019-11-27  42  	if (vm_flags & VM_ARM64_BTI)
9f3419315f3cdc Catalin Marinas 2019-11-27  43  		prot |= PTE_GP;
9f3419315f3cdc Catalin Marinas 2019-11-27  44  
9f3419315f3cdc Catalin Marinas 2019-11-27  45  	/*
9f3419315f3cdc Catalin Marinas 2019-11-27  46  	 * There are two conditions required for returning a Normal Tagged
9f3419315f3cdc Catalin Marinas 2019-11-27  47  	 * memory type: (1) the user requested it via PROT_MTE passed to
9f3419315f3cdc Catalin Marinas 2019-11-27  48  	 * mmap() or mprotect() and (2) the corresponding vma supports MTE. We
9f3419315f3cdc Catalin Marinas 2019-11-27  49  	 * register (1) as VM_MTE in the vma->vm_flags and (2) as
9f3419315f3cdc Catalin Marinas 2019-11-27  50  	 * VM_MTE_ALLOWED. Note that the latter can only be set during the
9f3419315f3cdc Catalin Marinas 2019-11-27  51  	 * mmap() call since mprotect() does not accept MAP_* flags.
9f3419315f3cdc Catalin Marinas 2019-11-27  52  	 */
9f3419315f3cdc Catalin Marinas 2019-11-27 @53  	if ((vm_flags & VM_MTE) && (vm_flags & VM_MTE_ALLOWED))
9f3419315f3cdc Catalin Marinas 2019-11-27  54  		prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED);
9f3419315f3cdc Catalin Marinas 2019-11-27  55  
9f3419315f3cdc Catalin Marinas 2019-11-27  56  	return __pgprot(prot);
8ef8f360cf30be Dave Martin     2020-03-16  57  }
8ef8f360cf30be Dave Martin     2020-03-16  58  #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
8ef8f360cf30be Dave Martin     2020-03-16  59  

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