Re: [PATCH] mm: Generalize HUGETLB_PAGE_SIZE_VARIABLE

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On 3/1/21 3:22 PM, kernel test robot wrote:
> Hi Anshuman,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on powerpc/next]
> [also build test ERROR on linus/master v5.12-rc1 next-20210301]
> [cannot apply to hnaz-linux-mm/master]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/0day-ci/linux/commits/Anshuman-Khandual/mm-Generalize-HUGETLB_PAGE_SIZE_VARIABLE/20210301-135205
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
> config: ia64-randconfig-r003-20210301 (attached as .config)
> compiler: ia64-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/0day-ci/linux/commit/fe78e3508e5221ac13aa288136e2a6506211be68
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Anshuman-Khandual/mm-Generalize-HUGETLB_PAGE_SIZE_VARIABLE/20210301-135205
>         git checkout fe78e3508e5221ac13aa288136e2a6506211be68
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from arch/ia64/include/asm/pgtable.h:154,
>                     from include/linux/pgtable.h:6,
>                     from include/linux/mm.h:33,
>                     from mm/page_alloc.c:19:
>    arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
>    arch/ia64/include/asm/mmu_context.h:127:41: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
>      127 |  unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
>          |                                         ^~~~~~~
>    In file included from include/linux/kconfig.h:7,
>                     from <command-line>:
>    mm/page_alloc.c: At top level:
>>> ./include/generated/autoconf.h:269:36: error: expected identifier or '(' before numeric constant
>      269 | #define CONFIG_FORCE_MAX_ZONEORDER 11
>          |                                    ^~
>    include/linux/mmzone.h:29:19: note: in expansion of macro 'CONFIG_FORCE_MAX_ZONEORDER'
>       29 | #define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
>          |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/pageblock-flags.h:48:27: note: in expansion of macro 'MAX_ORDER'
>       48 | #define pageblock_order  (MAX_ORDER-1)
>          |                           ^~~~~~~~~
>    mm/page_alloc.c:250:14: note: in expansion of macro 'pageblock_order'
>      250 | unsigned int pageblock_order __read_mostly;
>          |              ^~~~~~~~~~~~~~~
>    mm/page_alloc.c:2618:5: warning: no previous prototype for 'find_suitable_fallback' [-Wmissing-prototypes]
>     2618 | int find_suitable_fallback(struct free_area *area, unsigned int order,
>          |     ^~~~~~~~~~~~~~~~~~~~~~
>    mm/page_alloc.c:3596:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes]
>     3596 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
>          |               ^~~~~~~~~~~~~~~~~~~~~~
>    mm/page_alloc.c:6257:23: warning: no previous prototype for 'memmap_init' [-Wmissing-prototypes]
>     6257 | void __meminit __weak memmap_init(unsigned long size, int nid,
>          |                       ^~~~~~~~~~~
>    mm/page_alloc.c: In function 'set_pageblock_order':
>>> mm/page_alloc.c:6798:6: error: 'HPAGE_SHIFT' undeclared (first use in this function); did you mean 'PAGE_SHIFT'?
>     6798 |  if (HPAGE_SHIFT > PAGE_SHIFT)
>          |      ^~~~~~~~~~~
>          |      PAGE_SHIFT
>    mm/page_alloc.c:6798:6: note: each undeclared identifier is reported only once for each function it appears in
>>> mm/page_alloc.c:6799:11: error: 'HUGETLB_PAGE_ORDER' undeclared (first use in this function)
>     6799 |   order = HUGETLB_PAGE_ORDER;
>          |           ^~~~~~~~~~~~~~~~~~
>>> mm/page_alloc.c:6808:18: error: lvalue required as left operand of assignment
>     6808 |  pageblock_order = order;
>          |                  ^
> 
> Kconfig warnings: (for reference only)
>    WARNING: unmet direct dependencies detected for HUGETLB_PAGE_SIZE_VARIABLE
>    Depends on HUGETLB_PAGE
>    Selected by
>    - IA64

This shows that HUGETLB_PAGE_SIZE_VARIABLE could be selected without HUGETLB_PAGE
being enabled, which was not intended. The dependency on HUGETLB_PAGE need to be
explicit for HUGETLB_PAGE_SIZE_VARIABLE.




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