-----Original Message-----
From: Anshuman Khandual <anshuman.khandual(a)arm.com>
Sent: 2020年6月30日 9:05
To: lkp <lkp(a)intel.com>; linux-mm(a)kvack.org
Cc: kbuild-all(a)lists.01.org; robin.murphy(a)arm.com; Catalin Marinas
<catalin.marinas(a)arm.com>; Will Deacon <will(a)kernel.org>; Mark Rutland
<mark.rutland(a)arm.com>; Mike Kravetz <mike.kravetz(a)oracle.com>; Barry
Song <song.bao.hua(a)hisilicon.com>; Andrew Morton <akpm@linux-
foundation.org>
Subject: [kbuild-all] Re: [PATCH V2] arm64/hugetlb: Reserve CMA areas for
gigantic pages on 16K and 64K configs
On 06/29/2020 04:38 PM, kernel test robot wrote:
> Hi Anshuman,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on v5.8-rc3]
> [also build test WARNING on next-20200629] [cannot apply to
> arm64/for-next/core] [If your patch is applied to the wrong git tree,
> kindly drop us a note.
> And when submitting patch, we suggest to use as documented in
>
https://git-scm.com/docs/git-format-patch]
>
> url:
https://github.com/0day-ci/linux/commits/Anshuman-Khandual/arm64-
hugetlb-Reserve-CMA-areas-for-gigantic-pages-on-16K-and-64K-
configs/20200629-144736
> base: 9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68
> config: arm64-defconfig (attached as .config)
> compiler: aarch64-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
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross
> ARCH=arm64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp(a)intel.com>
>
> All warnings (new ones prefixed by >>):
>
>>> arch/arm64/mm/hugetlbpage.c:40:13: warning: no previous prototype
>>> for 'arm64_hugetlb_cma_reserve' [-Wmissing-prototypes]
> 40 | void __init arm64_hugetlb_cma_reserve(void)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~
This only comes up with W=1 and I wonder if this is truly a valid warning. Should
all non-static function needs to have a declaration in a header file ? In this case,
there is a declaration for this function near the call site itself, why should not that
be sufficient.
Yes, -Wmissing-prototypes only enabled when make W=1. Kindly refer to
FAQ
please ignore this warning if confirmed it is not a issue here. sorry for inconvenient.
>
>#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA) void
>arm64_hugetlb_cma_reserve(void); <--------- Declaration #else static inline void
>arm64_hugetlb_cma_reserve(void) { } #endif
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