[LITMUS^RT] Litmus RT building problem

[Jonathan Herman]

Hi Alfred,

An immediate fix is to use the config provided by the web page to get
around this issue:
 wget http://www.litmus-rt.org/releases/2012.1/x86_64-config && mv
x86_64-config .config
And rebuild:
 make bzImage

Tomorrow a fix for the issue you encountered will be up on the web page.
Thanks for noticing this,
it revealed a serious issue with one of the configuration options.

On Thu, Feb 16, 2012 at 6:10 PM, Alfred Zhong <alfchung02 at gmail.com> wrote:

> Hi dear Litmus RT developers,
>
> Question Summary:
> I tried to build Litmus RT following this tutorial
> https://wiki.litmus-rt.org/litmus/InstallationInstructions
>
>  I encountered an compiling error after typing, I found a hack to get
> around it and built the kernel successfully. However, I would like to know
> the standard way to do it.
>
>
>
> Here is the detail:
>
> At the stage of
> $ make bzImage
>
> I got this error
> litmus/sched_plugin.c:85:4: error: implicit declaration of function
> ‘request_exit_np_atomic’ [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
>
> So I search where this function is declared
> $ grep -r "request_exit_np_atomic" *
>
> and found
>  include/litmus/litmus.h:inline int request_exit_np_atomic(struct
> task_struct *t)
>
> then I discovered that this declaration in litmus.h is inside
> #ifdef CONFIG_NP_SECTION
> ...
> #else
> ...
>
> and I search for CONFIG_NP_SECTION and found it is not defined anywhere,
> so the function 'request_exit_np_atomic' is never declared.
>
> then I added
> #define CONFIG_NP_SECTION
> before
> #include <litmus/litmus.h> in sched_plugin.c
>
> Then I got another error.
> include/litmus/litmus.h: In function ‘is_kernel_np’:
> include/litmus/litmus.h:135:18: error: ‘struct rt_param’ has no member
> named ‘kernel_np’
> include/litmus/litmus.h: In function ‘make_np’:
> include/litmus/litmus.h:157:11: error: ‘struct rt_param’ has no member
> named ‘kernel_np’
> include/litmus/litmus.h: In function ‘take_np’:
> include/litmus/litmus.h:165:20: error: ‘struct rt_param’ has no member
> named ‘kernel_np’
> In file included from litmus/sched_plugin.c:16:0:
> include/litmus/sched_plugin.h: At top level:
> include/litmus/sched_plugin.h:59:6: warning: ‘struct litmus_lock’ declared
> inside parameter list [enabled by default]
> include/litmus/sched_plugin.h:59:6: warning: its scope is only this
> definition or declaration, which is probably not what you want [enabled by
> default]
> litmus/sched_plugin.c: In function ‘is_kernel_np’:
> include/litmus/litmus.h:136:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> make[1]: *** [litmus/sched_plugin.o] Error 1
> make: *** [litmus] Error 2
>
> And here is my hack to get around. I copied the whole function of
> 'request_exit_np' to the beginning of sched_plugin.c, and this time it
> builds the whole kernel successfully.
>
> I am wondering if there is anything else I need to configure that the
> tutorial doesn't mention to make this go in a standard way?
>
>
> Thanks!
> Alfred
>
>
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>
>


-- 
Jonathan Herman
Department of Computer Science at UNC Chapel Hill
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