Re: [linux-next:master 7435/9209] include/linux/compiler_types.h:328:38: error: call to '__compiletime_assert_236' declared with attribute error: unexpected size in kmalloc_index()

[Hyeonggon Yoo <42.hyeyoo@gmail.com>]

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On Sat, Jun 12, 2021, 8:10 AM Andrew Morton <akpm@linux-foundation.org>
wrote:

> On Sat, 12 Jun 2021 00:08:43 +0800 kernel test robot <lkp@intel.com>
> wrote:
>
> > tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   25fe90f43fa312213b653dc1f12fd2d80f855883
> > commit: df2de13a32afec989c0e735beb3bc391b3de1dbd [7435/9209] mm, slub:
> change run-time assertion in kmalloc_index() to compile-time
> > config: sparc-randconfig-r005-20210611 (attached as .config)
> > compiler: sparc64-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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=df2de13a32afec989c0e735beb3bc391b3de1dbd
> >         git remote add linux-next
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> >         git fetch --no-tags linux-next master
> >         git checkout df2de13a32afec989c0e735beb3bc391b3de1dbd
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross
> ARCH=sparc
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All errors (new ones prefixed by >>):
> >
> >    In file included from <command-line>:
> >    In function 'kmalloc_index',
> >        inlined from 'kmalloc_node' at include/linux/slab.h:572:20,
> >        inlined from 'bpf_map_kmalloc_node.isra.0.part.0' at
> include/linux/bpf.h:1319:9:
> > >> include/linux/compiler_types.h:328:38: error: call to
> '__compiletime_assert_236' declared with attribute error: unexpected size
> in kmalloc_index()
> >      328 |  _compiletime_assert(condition, msg, __compiletime_assert_,
> __COUNTER__)
> >          |                                      ^
> >    include/linux/compiler_types.h:309:4: note: in definition of macro
> '__compiletime_assert'
> >      309 |    prefix ## suffix();    \
> >          |    ^~~~~~
> >    include/linux/compiler_types.h:328:2: note: in expansion of macro
> '_compiletime_assert'
> >      328 |  _compiletime_assert(condition, msg, __compiletime_assert_,
> __COUNTER__)
> >          |  ^~~~~~~~~~~~~~~~~~~
> >    include/linux/build_bug.h:39:37: note: in expansion of macro
> 'compiletime_assert'
> >       39 | #define BUILD_BUG_ON_MSG(cond, msg)
> compiletime_assert(!(cond), msg)
> >          |                                     ^~~~~~~~~~~~~~~~~~
> >    include/linux/slab.h:389:2: note: in expansion of macro
> 'BUILD_BUG_ON_MSG'
> >      389 |  BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()");
> >          |  ^~~~~~~~~~~~~~~~
> >
>
> This log doesn't show which .c file was being compiled at the time.
> Can this info be included?
>
> For me, it was kernel/bpf/local_storage.c.
>

Yes. the file It is kernel/bpf/local_storage.c

>

> I don't see anything wrong with the code.  Did this gcc simply screw up
> __builtin_constant_p()?


It seems there is false positive when CONFIG_PROFILE_ALL_BRANCHES=y

See this:
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/45UNTPJX7VUKLB6TUYPJOS7DMREVW5US/

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