Re: linux-next: build failure after merge of the mm tree

[Lance Yang]

Hey Stephen,

Thanks a lot for reporting!

I'll fix this bug in the next version.

Best,
Lance Yang

On Tue, Apr 30, 2024 at 8:38 AM Stephen Rothwell <sfr@xxxxxxxxx.orgau> wrote:
>
> Hi all,
>
> After merging the mm tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
>
> In file included from <command-line>:
> mm/rmap.c: In function 'try_to_unmap_one':
> include/linux/compiler_types.h:460:45: error: call to '__compiletime_assert_344' declared with attribute error: BUILD_BUG failed
>   460 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |                                             ^
> include/linux/compiler_types.h:441:25: note: in definition of macro '__compiletime_assert'
>   441 |                         prefix ## suffix();                             \
>       |                         ^~~~~~
> include/linux/compiler_types.h:460:9: note: in expansion of macro '_compiletime_assert'
>   460 |         _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/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>    59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
>       |                     ^~~~~~~~~~~~~~~~
> include/linux/huge_mm.h:99:28: note: in expansion of macro 'BUILD_BUG'
>    99 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
>       |                            ^~~~~~~~~
> include/linux/huge_mm.h:106:35: note: in expansion of macro 'HPAGE_PMD_SHIFT'
>   106 | #define HPAGE_PMD_SIZE  ((1UL) << HPAGE_PMD_SHIFT)
>       |                                   ^~~~~~~~~~~~~~~
> include/linux/huge_mm.h:105:28: note: in expansion of macro 'HPAGE_PMD_SIZE'
>   105 | #define HPAGE_PMD_MASK  (~(HPAGE_PMD_SIZE - 1))
>       |                            ^~~~~~~~~~~~~~
> mm/rmap.c:1651:41: note: in expansion of macro 'HPAGE_PMD_MASK'
>  1651 |                 range.start = address & HPAGE_PMD_MASK;
>       |                                         ^~~~~~~~~~~~~~
>
> Caused by commit
>
>   34d66beb14bd ("mm/rmap: integrate PMD-mapped folio splitting into pagewalk loop")
>
> from the mm-unstable branch of the mm tree.
>
> I have reverted that commit and the following one for today.
>
> --
> Cheers,
> Stephen Rothwell