Re: linux-next: Tree for Apr 14 (mm/shmem.c)

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On Tue, 14 Apr 2020 07:18:01 -0700 Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:

> On 4/13/20 7:39 PM, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Changes since 20200413:
> > 
> > New tree: mhi
> > 
> > My fixes tree contains:
> > 
> >   6b038bdcd3d1 sh: mm: Fix build error
> > 
> > Non-merge commits (relative to Linus' tree): 1154
> >  1160 files changed, 31764 insertions(+), 13498 deletions(-)
> > 
> > ----------------------------------------------------------------------------
> 
> on x86_64:
> # CONFIG_TRANSPARENT_HUGEPAGE is not set

Thanks.  hm, this took a long time to be discovered.

> In file included from ../include/linux/export.h:43:0,
>                  from ../include/linux/linkage.h:7,
>                  from ../include/linux/fs.h:5,
>                  from ../mm/shmem.c:24:
> ../mm/shmem.c: In function ‘shmem_undo_range’:
> ../include/linux/compiler.h:394:38: error: call to ‘__compiletime_assert_110’ declared with attribute error: BUILD_BUG failed
>   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>                                       ^
> ../include/linux/compiler.h:69:3: note: in definition of macro ‘__trace_if_value’
>   (cond) ?     \
>    ^~~~
> ../include/linux/compiler.h:56:28: note: in expansion of macro ‘__trace_if_var’
>  #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
>                             ^~~~~~~~~~~~~~
> ../mm/shmem.c:960:6: note: in expansion of macro ‘if’
>       if (index <
>       ^~
> ../include/linux/kernel.h:71:36: note: in expansion of macro ‘__round_mask’
>  #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
>                                     ^~~~~~~~~~~~
> ../mm/shmem.c:961:10: note: in expansion of macro ‘round_up’
>           round_up(start, HPAGE_PMD_NR))
>           ^~~~~~~~
> ../include/linux/compiler.h:382:2: note: in expansion of macro ‘__compiletime_assert’
>   __compiletime_assert(condition, msg, prefix, suffix)
>   ^~~~~~~~~~~~~~~~~~~~
> ../include/linux/compiler.h:394:2: note: in expansion of macro ‘_compiletime_assert’
>   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>   ^~~~~~~~~~~~~~~~~~~
> ../include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
>  #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’
>  #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
>                      ^~~~~~~~~~~~~~~~
> ../include/linux/huge_mm.h:319:28: note: in expansion of macro ‘BUILD_BUG’
>  #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
>                             ^~~~~~~~~
> ../include/linux/huge_mm.h:115:26: note: in expansion of macro ‘HPAGE_PMD_SHIFT’
>  #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
>                           ^~~~~~~~~~~~~~~
> ../include/linux/huge_mm.h:116:26: note: in expansion of macro ‘HPAGE_PMD_ORDER’
>  #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
>                           ^~~~~~~~~~~~~~~
> ../mm/shmem.c:961:26: note: in expansion of macro ‘HPAGE_PMD_NR’
>           round_up(start, HPAGE_PMD_NR))
>                           ^~~~~~~~~~~~
> 

That's

					if (index <
					    round_up(start, HPAGE_PMD_NR))
						start = index + 1;

from Hugh's 71725ed10c40696 ("mm: huge tmpfs: try to split_huge_page()
when punching hole").






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