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-20180223]
[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-skiroot_defconfig (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 errors (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':

quoted

arch/powerpc/include/asm/pkeys.h:32:23: error: 'VM_PKEY_BIT4' undeclared (first use in this function); did you mean 'VM_PKEY_BIT3'?

           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_BIT3'?
      ((vm_flags & VM_PKEY_BIT4) ? H_PTE_PKEY_BIT0 : 0x0UL));
                   ^~~~~~~~~~~~
                   VM_PKEY_BIT3
   arch/powerpc/include/asm/pkeys.h: In function 'vma_pkey':

quoted

arch/powerpc/include/asm/pkeys.h:32:23: error: 'VM_PKEY_BIT4' undeclared (first use in this function); did you mean 'VM_PKEY_BIT3'?

           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  

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

:::::: TO: Ram Pai [off-list ref]
:::::: CC: Michael Ellerman [off-list ref]

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation