linux-kernel - Re: [PATH] Fix compilation when CONFIG_TRACE_IRQFLAGS

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Date:	Thu, 4 Sep 2008 19:47:53 +0200
From:	Rui Sousa <rui.p.m.sousa@...il.com>
To:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATH] Fix compilation when CONFIG_TRACE_IRQFLAGS_SUPPORT is not set

On Thursday 4 September 2008 19:14, Hiroshi Shimamoto wrote:
> Ingo Molnar wrote:
> > * Rui Sousa <rui.p.m.sousa@...il.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...

> 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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