[next] mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have 'int(unsigned int, long unsigned int *)'

[next] mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have 'int(unsigned int, long unsigned int *)'

[Naresh Kamboju]

[Please ignore this email if it already reported]
A large number of build failures noticed on Linux next for all arch's with
 - tinyconfig
 - allnoconfig

Build Error:
-------------
mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have
'int(unsigned int,  long unsigned int *)'
 3993 | int shmem_unuse(unsigned int type, unsigned long *fs_pages_to_unuse)
      |     ^~~~~~~~~~~
In file included from include/linux/khugepaged.h:6,
                 from mm/shmem.c:37:
include/linux/shmem_fs.h:86:5: note: previous declaration of
'shmem_unuse' with type 'int(unsigned int)'
   86 | int shmem_unuse(unsigned int type);
      |     ^~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:289: mm/shmem.o] Error 1

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

Build link: https://builds.tuxbuild.com/23GvPWRYOYokAPaEnhSYeOKuKCk/
Kconfig: https://builds.tuxbuild.com/23GvPWRYOYokAPaEnhSYeOKuKCk/config

Steps to reproduce:
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake

tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-11
--kconfig tinyconfig

--
Linaro LKFT
https://lkft.linaro.org

Re: [next] mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have 'int(unsigned int, long unsigned int *)'

[Matthew Wilcox]

On Wed, Jan 05, 2022 at 08:01:19PM +0530, Naresh Kamboju wrote:
> mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have
> 'int(unsigned int,  long unsigned int *)'
>  3993 | int shmem_unuse(unsigned int type, unsigned long *fs_pages_to_unuse)
>       |     ^~~~~~~~~~~
> In file included from include/linux/khugepaged.h:6,
>                  from mm/shmem.c:37:
> include/linux/shmem_fs.h:86:5: note: previous declaration of
> 'shmem_unuse' with type 'int(unsigned int)'
>    86 | int shmem_unuse(unsigned int type);
>       |     ^~~~~~~~~~~

This is "mm: simplify try_to_unuse" in akpm's tree.

It needs a fix that looks something like this:

+++ b/mm/shmem.c
@@ -3990,7 +3990,7 @@ int __init shmem_init(void)
        return 0;
 }

-int shmem_unuse(unsigned int type, unsigned long *fs_pages_to_unuse)
+int shmem_unuse(unsigned int type)
 {
        return 0;
 }

Re: [next] mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have 'int(unsigned int, long unsigned int *)'

[Randy Dunlap]

On 1/5/22 09:40, Matthew Wilcox wrote:
> On Wed, Jan 05, 2022 at 08:01:19PM +0530, Naresh Kamboju wrote:
>> mm/shmem.c:3993:5: error: conflicting types for 'shmem_unuse'; have
>> 'int(unsigned int,  long unsigned int *)'
>>  3993 | int shmem_unuse(unsigned int type, unsigned long *fs_pages_to_unuse)
>>       |     ^~~~~~~~~~~
>> In file included from include/linux/khugepaged.h:6,
>>                  from mm/shmem.c:37:
>> include/linux/shmem_fs.h:86:5: note: previous declaration of
>> 'shmem_unuse' with type 'int(unsigned int)'
>>    86 | int shmem_unuse(unsigned int type);
>>       |     ^~~~~~~~~~~
> 
> This is "mm: simplify try_to_unuse" in akpm's tree.
> 
> It needs a fix that looks something like this:

Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested

thanks.

> 
> +++ b/mm/shmem.c
> @@ -3990,7 +3990,7 @@ int __init shmem_init(void)
>         return 0;
>  }
> 
> -int shmem_unuse(unsigned int type, unsigned long *fs_pages_to_unuse)
> +int shmem_unuse(unsigned int type)
>  {
>         return 0;
>  }
> 

-- 
~Randy