Hi Ram,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc2 next-20180222]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ram-Pai/mm-x86-powerpc-Enhancements-to-Memory-Protection-Keys/20180223-042743
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

Note: the linux-review/Ram-Pai/mm-x86-powerpc-Enhancements-to-Memory-Protection-Keys/20180223-042743 HEAD c5692bca45543c242ffca15c811923e4c548ed19 builds fine.
      It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/pkeys.h:9:0,
                    from arch/powerpc/include/asm/mman.h:16,
                    from include/uapi/linux/mman.h:5,
                    from include/linux/mman.h:9,
                    from arch/powerpc/kernel/asm-offsets.c:22:
   arch/powerpc/include/asm/pkeys.h: In function 'pkey_to_vmflag_bits':
>> arch/powerpc/include/asm/pkeys.h:32:23: error: 'VM_PKEY_BIT4' undeclared (first use in this function); did you mean 'VM_PKEY_BIT0'?
           VM_PKEY_BIT3 | VM_PKEY_BIT4)
                          ^
>> arch/powerpc/include/asm/pkeys.h:42:41: note: in expansion of macro 'ARCH_VM_PKEY_FLAGS'
     return (((u64)pkey << VM_PKEY_SHIFT) & ARCH_VM_PKEY_FLAGS);
                                            ^~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/pkeys.h:32:23: note: each undeclared identifier is reported only once for each function it appears in
           VM_PKEY_BIT3 | VM_PKEY_BIT4)
                          ^
>> arch/powerpc/include/asm/pkeys.h:42:41: note: in expansion of macro 'ARCH_VM_PKEY_FLAGS'
     return (((u64)pkey << VM_PKEY_SHIFT) & ARCH_VM_PKEY_FLAGS);
                                            ^~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/pkeys.h: In function 'vmflag_to_pte_pkey_bits':
   arch/powerpc/include/asm/pkeys.h:54:16: error: 'VM_PKEY_BIT4' undeclared (first use in this function); did you mean 'VM_PKEY_BIT0'?
      ((vm_flags & VM_PKEY_BIT4) ? H_PTE_PKEY_BIT0 : 0x0UL));
                   ^~~~~~~~~~~~
                   VM_PKEY_BIT0
   arch/powerpc/include/asm/pkeys.h: In function 'vma_pkey':
>> arch/powerpc/include/asm/pkeys.h:32:23: error: 'VM_PKEY_BIT4' undeclared (first use in this function); did you mean 'VM_PKEY_BIT0'?
           VM_PKEY_BIT3 | VM_PKEY_BIT4)
                          ^
   arch/powerpc/include/asm/pkeys.h:61:26: note: in expansion of macro 'ARCH_VM_PKEY_FLAGS'
     return (vma->vm_flags & ARCH_VM_PKEY_FLAGS) >> VM_PKEY_SHIFT;
                             ^~~~~~~~~~~~~~~~~~
   make[2]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +32 arch/powerpc/include/asm/pkeys.h

4fb158f6 Ram Pai 2018-01-18  30  
4fb158f6 Ram Pai 2018-01-18  31  #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
4fb158f6 Ram Pai 2018-01-18 @32  			    VM_PKEY_BIT3 | VM_PKEY_BIT4)
4fb158f6 Ram Pai 2018-01-18  33  
013a91b3 Ram Pai 2018-01-18  34  /* Override any generic PKEY permission defines */
013a91b3 Ram Pai 2018-01-18  35  #define PKEY_DISABLE_EXECUTE   0x4
013a91b3 Ram Pai 2018-01-18  36  #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS | \
013a91b3 Ram Pai 2018-01-18  37  				PKEY_DISABLE_WRITE  | \
013a91b3 Ram Pai 2018-01-18  38  				PKEY_DISABLE_EXECUTE)
013a91b3 Ram Pai 2018-01-18  39  
013a91b3 Ram Pai 2018-01-18  40  static inline u64 pkey_to_vmflag_bits(u16 pkey)
013a91b3 Ram Pai 2018-01-18  41  {
013a91b3 Ram Pai 2018-01-18 @42  	return (((u64)pkey << VM_PKEY_SHIFT) & ARCH_VM_PKEY_FLAGS);
013a91b3 Ram Pai 2018-01-18  43  }
013a91b3 Ram Pai 2018-01-18  44  

:::::: The code at line 32 was first introduced by commit
:::::: 4fb158f65ac5556b9b4a6f63f38272853ed99b22 powerpc: track allocation status of all pkeys

:::::: TO: Ram Pai <linuxram@us.ibm.com>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>

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