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SubjectRe: [PATH] Fix compilation when CONFIG_TRACE_IRQFLAGS_SUPPORT is not set
Rui Sousa wrote:
> On Thursday 4 September 2008 19:14, Hiroshi Shimamoto wrote:
>> Ingo Molnar wrote:
>>> * Rui Sousa <rui.p.m.sousa@gmail.com> wrote:
>>>> Hi,
>>>>
>>>> This patch fixes compilation if CONFIG_TRACE_IRQFLAGS_SUPPORT is ever
>>>> disabled (which is currently not allowed by Kconfig). Alternatively we
>>>> could just remove the option altogether and the associated code paths.
>>>> Since the compilation error has been in the tree for at least two
>>>> years and no one noticed it, I guess we don't really have the need for
>>>> CONFIG_TRACE_IRQFLAGS_SUPPORT=n. Boot tested on x86 UP.
>>> applied to tip/core/locking - thanks Rui.
>>>
>>> since you fixed it i prefer the fix over the removal. We could still
>>> remove the !TRACE_IRQFLAGS_SUPPORT now (in a separate commit) and
>>> simpify this header a bit that way. Thus if someone needs the
>>> !TRACE_IRQFLAGS_SUPPORT mode of build for future work, it can be
>>> restored via a simple revert.
>> Hi, it seems that this patch breaks uml build.
>
> Hi Hiroshi,
>
>> kernel/printk.c: In function 'vprintk':
>> kernel/printk.c:674: error: implicit declaration of function
>> 'raw_local_irq_save' kernel/printk.c:772: error: implicit declaration of
>> function 'raw_local_irq_restore'
>
> With the patch bellow it compiles (make ARCH=um with a x86 host), but I'm
> really out of my league on this one...

Hi Rui,

with this patch, build and boot (on my x86_64 box) looks ok.

I CC-ed to uml people to check this.

thanks,
Hiroshi Shimamoto

>
>> thanks,
>> Hiroshi Shimamoto
>
> Thanks,
> Rui
>
> ---
> diff --git a/include/asm-um/system-generic.h b/include/asm-um/system-generic.h
> index 5bcfa35..f1ea4da 100644
> --- a/include/asm-um/system-generic.h
> +++ b/include/asm-um/system-generic.h
> @@ -4,15 +4,15 @@
> #include "asm/arch/system.h"
>
> #undef switch_to
> -#undef local_irq_save
> -#undef local_irq_restore
> -#undef local_irq_disable
> -#undef local_irq_enable
> -#undef local_save_flags
> -#undef local_irq_restore
> -#undef local_irq_enable
> -#undef local_irq_disable
> -#undef local_irq_save
> +#undef raw_local_irq_save
> +#undef raw_local_irq_restore
> +#undef raw_local_irq_disable
> +#undef raw_local_irq_enable
> +#undef raw_local_save_flags
> +#undef raw_local_irq_restore
> +#undef raw_local_irq_enable
> +#undef raw_local_irq_disable
> +#undef raw_local_irq_save
> #undef irqs_disabled
>
> extern void *switch_to(void *prev, void *next, void *last);
> @@ -23,21 +23,21 @@ extern int get_signals(void);
> extern void block_signals(void);
> extern void unblock_signals(void);
>
> -#define local_save_flags(flags) do { typecheck(unsigned long, flags); \
> +#define raw_local_save_flags(flags) do { typecheck(unsigned long, flags); \
> (flags) = get_signals(); } while(0)
> -#define local_irq_restore(flags) do { typecheck(unsigned long, flags); \
> +#define raw_local_irq_restore(flags) do { typecheck(unsigned long, flags); \
> set_signals(flags); } while(0)
>
> -#define local_irq_save(flags) do { local_save_flags(flags); \
> - local_irq_disable(); } while(0)
> +#define raw_local_irq_save(flags) do { raw_local_save_flags(flags); \
> + raw_local_irq_disable(); } while(0)
>
> -#define local_irq_enable() unblock_signals()
> -#define local_irq_disable() block_signals()
> +#define raw_local_irq_enable() unblock_signals()
> +#define raw_local_irq_disable() block_signals()
>
> #define irqs_disabled() \
> ({ \
> unsigned long flags; \
> - local_save_flags(flags); \
> + raw_local_save_flags(flags); \
> (flags == 0); \
> })
>
> --
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