[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Chen Gang]

Hello Maintainers:

  when use randconfig:
    make V=1 EXTRA_CFLAGS=-W ARCH=arm randconfig
      (and "grep CONFIG_MMU .config" outputs "# CONFIG_MMU is not set")

  the error information:
    arch/arm/kernel/suspend.c: ????cpu_suspend??:
    arch/arm/kernel/suspend.c:56:32: ???????????????
    arch/arm/kernel/suspend.c:70:3: ??????????cpu_switch_mm? [-Werror=implicit-function-declaration]
    arch/arm/kernel/suspend.c:71:3: ??????????local_flush_bp_all? [-Werror=implicit-function-declaration]
    arch/arm/kernel/suspend.c:72:3: ??????????local_flush_tlb_all? [-Werror=implicit-function-declaration]

  I want to be sure whether we can bear it ?

  thanks.

-- 
Chen Gang

Asianux Corporation

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Chen Gang]

also has additional information (maybe useful):

  arch/arm/kernel/entry-armv.S:404:2: ???#warning "NPTL on non MMU needs fixing" [-Wcpp]
  arch/arm/kernel/entry-armv.S:867:2: ???#warning "NPTL on non MMU needs fixing" [-Wcpp]
  arch/arm/kernel/entry-armv.S:940:2: ???#warning "NPTL on non MMU needs fixing" [-Wcpp]


? 2013?03?14? 11:44, Chen Gang ??:
> Hello Maintainers:
> 
>   when use randconfig:
>     make V=1 EXTRA_CFLAGS=-W ARCH=arm randconfig
>       (and "grep CONFIG_MMU .config" outputs "# CONFIG_MMU is not set")
> 
>   the error information:
>     arch/arm/kernel/suspend.c: ????cpu_suspend??:
>     arch/arm/kernel/suspend.c:56:32: ???????????????
>     arch/arm/kernel/suspend.c:70:3: ??????????cpu_switch_mm? [-Werror=implicit-function-declaration]
>     arch/arm/kernel/suspend.c:71:3: ??????????local_flush_bp_all? [-Werror=implicit-function-declaration]
>     arch/arm/kernel/suspend.c:72:3: ??????????local_flush_tlb_all? [-Werror=implicit-function-declaration]
> 
>   I want to be sure whether we can bear it ?
> 
>   thanks.
> 


-- 
Chen Gang

Asianux Corporation

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Jonathan Austin]

Hi Chen,

On 14/03/13 03:44, Chen Gang wrote:
> Hello Maintainers:
>
>    when use randconfig:
>      make V=1 EXTRA_CFLAGS=-W ARCH=arm randconfig
>        (and "grep CONFIG_MMU .config" outputs "# CONFIG_MMU is not set")
>
>    the error information:
>      arch/arm/kernel/suspend.c: ????cpu_suspend??:
>      arch/arm/kernel/suspend.c:56:32: ???????????????
>      arch/arm/kernel/suspend.c:70:3: ??????????cpu_switch_mm? [-Werror=implicit-function-declaration]
>      arch/arm/kernel/suspend.c:71:3: ??????????local_flush_bp_all? [-Werror=implicit-function-declaration]
>      arch/arm/kernel/suspend.c:72:3: ??????????local_flush_tlb_all? [-Werror=implicit-function-declaration]
>
>    I want to be sure whether we can bear it ?
>

You're right that at the moment that suspend code is broken for NOMMU.

However, Will Deacon has a patch to fix it in his nommu branch on 
kernel.org:

https://git.kernel.org/cgit/linux/kernel/git/will/linux.git/commit/?h=nommu

I'll let Will comment on how/when he might look at proposing that code 
to be merged.

Jonny

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Chen Gang]

? 2013?03?14? 21:25, Jonathan Austin ??:
> 
> You're right that at the moment that suspend code is broken for NOMMU.
> 
> However, Will Deacon has a patch to fix it in his nommu branch on
> kernel.org:
> 
> https://git.kernel.org/cgit/linux/kernel/git/will/linux.git/commit/?h=nommu
> 
> I'll let Will comment on how/when he might look at proposing that code
> to be merged.
> 
> Jonny

  thank you.

  :-)

-- 
Chen Gang

Asianux Corporation

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Will Deacon]

On Thu, Mar 14, 2013 at 01:25:56PM +0000, Jonathan Austin wrote:
> On 14/03/13 03:44, Chen Gang wrote:
> > Hello Maintainers:
> >
> >    when use randconfig:
> >      make V=1 EXTRA_CFLAGS=-W ARCH=arm randconfig
> >        (and "grep CONFIG_MMU .config" outputs "# CONFIG_MMU is not set")
> >
> >    the error information:
> >      arch/arm/kernel/suspend.c: ????cpu_suspend??:
> >      arch/arm/kernel/suspend.c:56:32: ???????????????
> >      arch/arm/kernel/suspend.c:70:3: ??????????cpu_switch_mm? [-Werror=implicit-function-declaration]
> >      arch/arm/kernel/suspend.c:71:3: ??????????local_flush_bp_all? [-Werror=implicit-function-declaration]
> >      arch/arm/kernel/suspend.c:72:3: ??????????local_flush_tlb_all? [-Werror=implicit-function-declaration]
> >
> >    I want to be sure whether we can bear it ?
> >
> 
> You're right that at the moment that suspend code is broken for NOMMU.
> 
> However, Will Deacon has a patch to fix it in his nommu branch on 
> kernel.org:
> 
> https://git.kernel.org/cgit/linux/kernel/git/will/linux.git/commit/?h=nommu
> 
> I'll let Will comment on how/when he might look at proposing that code 
> to be merged.

I can probably bring that up to speed with -rc2 if people are interested.
The tricky part is testing -- I used a software model that had a magic
control block for killing off CPUs when I wrote this originally.

Will

[Suggestion] Latest randconfig build errors for CONFIG_MMU=no

[Chen Gang]

On 2013?03?17? 22:40, Will Deacon wrote:
> I can probably bring that up to speed with -rc2 if people are interested.
> The tricky part is testing -- I used a software model that had a magic
> control block for killing off CPUs when I wrote this originally.

  excuse me, I am not familiar with ARM, so can not provide more ideas.

  but at least for me, I think what you said seems valuable.

  welcome any ARM experts to reply.


  thanks.

  :-)


-- 
Chen Gang

Asianux Corporation