Hi, Adam

I'm not so sure how to reply the mail in L4-hackers-list, So I CC to both the List mail address and thread mail address.

Thank you for your reply, and that really helps.

I find that those error occurred because the CONFIG_SMP and CONFIG_GENERIC_CLOCKEVENTS_BUILD is not set in .config.

I try to config them by 'make menuconfig' but there is none entry about CONFIG_SMP or CONFIG_GENERIC_CLOCKEVENTS_BUILD appeared in menuconfig. So I change the .config file directly, but once I invoke "make", the .config will be rewrite.

Would you mind give me any guide about how to set them?

Thank you very much.

Hi,

On Sat Apr 18, 2015 at 22:26:15 +0800, Youren Shen wrote:
> I'm trying to port L4Linux 3.14 to Linux Kernel 3.4. But when I complied
> the kernel, this error happened:
> /home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/kernel/main.c:
> In function 'cpu0_startup':
> /home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/kernel/main.c:2124:2:
> error: implicit declaration of function 'set_my_cpu_offset'
> [-Werror=implicit-function-declaration]
>
> I checked main.c file:
>
> #include <asm/unistd.h>
> #include <asm/percpu.h>
> #include <asm/generic/l4lib.h>
>
> So I add one percpu.h file with definition of 'set_my_cpu_offset' in
> /home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/include/asm/arch-arm/,
> however this error still happened.
>
> Then I add the definition of this function to
> /home/shenyouren/workspace/kernel/kernel_exynos5250/include/linux/percpu.h,
> then the error message will not show.
>
> Also, discard the change in $(src)/include/linux/percpu.h, then I change
> the main.c file to include absolute path of percpu.h.
>
> #include <asm/unistd.h>
> #include
> </home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/include/asm/arch-arm/percpu.h>
> #include <asm/generic/l4lib.h>
>
> It passed the complied to.

When you put a header file in arch/l4/include/asm/arch-arm/ including it
via <asm/foo.h> should work.

> So that is say, the #include <asm/percpu.h> is reference to
> src/include/linux/percpu.h. That really strange.

So, include <linux/percpu.h> in main.c right away?

The L4 part of L4Linux you're looking at is for 3.14 and you apply it to
Linux 3.4, please expect that things are different and need adaption.

> I do not change the Makefile in arch/l4, and I really confused about this
> error.
> Now this problem occurs to me again, when complied the
> arch/l4/kernel/timer.c file, this error happened:
>
> /home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/kernel/timer.c:153:35:
> warning: 'struct clock_event_device' declared inside parameter list
> [enabled by default]
> /home/shenyouren/workspace/kernel/kernel_exynos5250/arch/l4/kernel/timer.c:153:35:
> warning: its scope is only this definition or declaration, which is
> probably not what you want [enabled by default]
>
> but the definition of this to file should be defined in clockchips.h which
> is include in timer.c:
>
> #include <linux/timex.h>
> #include <linux/clockchips.h>
> #include <linux/irq.h>
>
> Thank you for your reading, I just want to know what's the rule of L4Linux
> header file linking, and solve this problem.
> I'd be so appreciated if anyone can give me some help!

There's a #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD in clockchips.h.
Not defined?

Adam
--
Adam adam@os.inf.tu-dresden.de
Lackorzynski http://os.inf.tu-dresden.de/~adam/

Best Regards.

Youren Shen.