On 12/09/2018 08:03 PM, Wei Yang wrote:
On Sat, Dec 08, 2018 at 09:42:29AM +0800, kbuild test robot wrote:
Hi Wei,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v4.20-rc5 next-20181207]
[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/Wei-Yang/mm-pageblock-make-sure-pageblock-won-t-exceed-mem_sectioin/20181207-030601
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
GCC_VERSION=7.2.0 make.cross ARCH=powerpc
All warnings (new ones prefixed by >>):
In file included from include/linux/gfp.h:6:0,
from include/linux/xarray.h:14,
from include/linux/radix-tree.h:31,
from include/linux/fs.h:15,
from include/linux/compat.h:17,
from arch/powerpc/kernel/asm-offsets.c:16:
include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef]
#if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS
^~~~~~~~~~~~~~~
--
In file included from include/linux/gfp.h:6:0,
from include/linux/mm.h:10,
from mm//swap.c:16:
include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef]
#if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS
^~~~~~~~~~~~~~~
In file included from include/linux/gfp.h:6:0,
from include/linux/mm.h:10,
from mm//swap.c:16:
include/linux/mmzone.h:1088:6: warning: "pageblock_order" is not defined, evaluates to 0 [-Wundef]
#if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS
^~~~~~~~~~~~~~~
vim +/pageblock_order +1088 include/linux/mmzone.h
1087
1088 #if (pageblock_order + PAGE_SHIFT) > SECTION_SIZE_BITS
1089 #error Allocator pageblock_order exceeds SECTION_SIZE
1090 #endif
1091
I took a look at the latest code, at line 1082 of the same file uses
pageblock_order. And I apply this patch on top of v4.20-rc5, the build
looks good to me.
Confused why this introduce an compile error.
Hi Wei,
we could reproduce the warnings with using make.cross.
Best Regards,
Rong Chen
---
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