linux-kernel - [RT] Compile error with certain IRQ debug config option combinations

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Date:	Thu, 14 Feb 2008 16:48:05 +0100
From:	"kus Kusche Klaus" <kus@...a.com>
To:	<linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: [RT] Compile error with certain IRQ debug config option combinations

I'm using 2.6.24.2 with -rt1 applied 
(applies cleanly with some offsets) on x86.

I've *not* configured PROVE_LOCKING (too expensive).
However, I selected all the latency tracings, timings and histograms,
among them CRITICAL_IRQSOFF_TIMING.
This implicitly configures TRACE_IRQFLAGS.
However, TRACE_IRQFLAGS depends on PROVE_LOCKING, which is off
(and not implicitly selected).

With TRACE_IRQFLAGS on and PROVE_LOCKING off,
compilation of kernel/lockdep.c fails miserably:
  CC      kernel/lockdep.o
kernel/lockdep.c: In function 'check_usage_forwards':
kernel/lockdep.c:1740: error: 'find_usage_bit' undeclared (first use in
this function)
kernel/lockdep.c:1740: error: (Each undeclared identifier is reported
only once
kernel/lockdep.c:1740: error: for each function it appears in.)
kernel/lockdep.c:1742: error: implicit declaration of function
'find_usage_forwards'
kernel/lockdep.c:1746: error: 'forwards_match' undeclared (first use in
this function)
kernel/lockdep.c: In function 'check_usage_backwards':
kernel/lockdep.c:1759: error: 'find_usage_bit' undeclared (first use in
this function)
kernel/lockdep.c:1761: error: implicit declaration of function
'find_usage_backwards'
kernel/lockdep.c:1765: error: 'backwards_match' undeclared (first use in
this function)
make[1]: *** [kernel/lockdep.o] Error 1

Looking at the source quickly, 
it seems that the #ifdefs do not cover that combination correctly, 
but I can't figure out how to fix that (the ifdef nesting in that file
seems to have grown over time...).

By the way: With all the tracing on, 
make also tries to compile scripts/trace-it.c (with HOSTCC),
which also fails if the kernel is cross-compiled in a non-linux
development environment 
(Interix in my case - don't ask me, I didn't vote for it...).

Many thanks in advance for any help!

Greetings

-- 
Klaus Kusche, DI. Dr.                    Software Development - Control
KEBA AG                        Gewerbepark Urfahr, A-4041 Linz, Austria
www.keba.com                         Firmenbuchgericht Linz FN 184376 t
mailto:kus@...a.com  Phone: +43 732 7090-23120  Fax: +43 732 7090-63401

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