Re: [kbuild-all] Re: include/linux/smp.h:34:33: error: requested alignment '20' is not a positive power of 2

[Chen, Rong A]

On 2/14/2022 4:44 AM, Helge Deller wrote:
> On 2/13/22 10:59, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   b81b1829e7e39f6cebdf6e4d5484eacbceda8554
> > commit: 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e parisc: Fix compile failure when building 64-bit kernel natively
> > date:   6 months ago
> > config: parisc-randconfig-r004-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131741.c6BPpfzd-lkp@xxxxxxxxx/config)
> > compiler: hppa64-linux-gcc (GCC) 11.2.0
> > 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e
> >          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >          git fetch --no-tags linus master
> >          git checkout 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e
> >          # save the config file to linux build tree
> >          mkdir build_dir
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc prepare
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All error/warnings (new ones prefixed by >>):
> >
> >     In file included from arch/parisc/include/asm/bitops.h:203,
> >                      from include/linux/bitops.h:32,
> >                      from include/linux/kernel.h:12,
> >                      from arch/parisc/include/asm/bug.h:5,
> >                      from include/linux/bug.h:5,
> >                      from include/linux/page-flags.h:10,
> >                      from kernel/bounds.c:10:
> >     include/asm-generic/bitops/__fls.h: In function '__fls':
> > > > include/asm-generic/bitops/__fls.h:18:28: warning: left shift count >= width of type [-Wshift-count-overflow]
> >        18 |         if (!(word & (~0ul << 32))) {
>
>
> This kind of build error usually happens if you use the 64-bit compiler
> (hppa64-linux-gcc) to compile a kernel config for a 32-bit kernel.
>
> Looking at the config:
> > config: parisc-randconfig-r004-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131741.c6BPpfzd-lkp@xxxxxxxxx/config)
> CONFIG_64BIT is set to Y, so that's correct here.
>
> But this is how you call the compiler:
> > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc prepare
>
> The "ARCH=parisc" is wrong in this case.
> You need:
> "ARCH=parisc64".
> This is starting with Linux kernel 5.14.
> Before "ARCH=parisc" worked for 32- and 64-bit kernels.
>
> Can you adjust the call command?

Hi Helge,

Thanks for the feedback, we'll update it.

Best Regards,
Rong Chen