Re: [PATCH] mm/zsmalloc.c: Fix zsmalloc 32-bit PAE support

[kbuild test robot]

Hi Rafael,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc6 next-20181212]
[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/Rafael-David-Tinoco/mm-zsmalloc-c-Fix-zsmalloc-32-bit-PAE-support/20181211-020704
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 8.1.0
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
        GCC_VERSION=8.1.0 make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

>> mm/zsmalloc.c:112:3: error: #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
     #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
      ^~~~~

vim +112 mm/zsmalloc.c

   103	
   104	/*
   105	 * MAX_POSSIBLE_PHYSMEM_BITS should be defined by all archs using zsmalloc:
   106	 * Trying to guess it from MAX_PHYSMEM_BITS, or considering it BITS_PER_LONG,
   107	 * proved to be wrong by not considering PAE capabilities, or using SPARSEMEM
   108	 * only headers, leading to bad object encoding due to object index overflow.
   109	 */
   110	#ifndef MAX_POSSIBLE_PHYSMEM_BITS
   111	 #define MAX_POSSIBLE_PHYSMEM_BITS BITS_PER_LONG
 > 112	 #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
   113	#else
   114	 #ifndef CONFIG_64BIT
   115	  #if (MAX_POSSIBLE_PHYSMEM_BITS >= (BITS_PER_LONG + PAGE_SHIFT - OBJ_TAG_BITS))
   116	   #error "MAX_POSSIBLE_PHYSMEM_BITS is wrong for this arch";
   117	  #endif
   118	 #endif
   119	#endif
   120	

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