[PATCH] Re: alpha: undefined reference to `save_stack_trace'

[Al Viro]

On Fri, Oct 31, 2008 at 06:48:22PM +0000, Al Viro wrote:
> On Fri, Oct 31, 2008 at 06:24:11PM +0000, Al Viro wrote:
> > On Fri, Oct 31, 2008 at 07:57:51PM +0300, Alexey Dobriyan wrote:
> > > On alpha-smp-[ny]-debug-y:
> > > 
> > >   LD      .tmp_vmlinux1
> > > kernel/built-in.o: In function `ftrace_trace_stack':
> > > (.text+0x706fc): undefined reference to `save_stack_trace'
> > > 
> > > 
> > > Somehow STACKTRACE is set despite no STACKTRACE_SUPPORT.
> > 
> > select blows, film at 11.  TRACING blindly selects STACKTRACE, with a bunch
> > of stuff in kernel/tracing/Kconfig doing select of TRACING.  Not just an alpha
> > problem, BTW.
> 
> While we are at it, we have that particular turd on allmodconfigs on (at least)
> 	alpha
> 	blackfin
> 	cris
> 	frv
> 	h8300
> 	ia64
> 	m32r
> 	m68k
> 	m68knommu
> 	mn10300
> 	parisc
> 	sparc (32bit one, that is)
> 	uml/i386
> 	uml/amd64
> 	xtensa
> 
> We could slap && HAS_STACKTRACE_SUPPORT on all symbols that end up selecting
> TRACING, but that's almost certainly wrong; the thing won't break if we
> simply omit stack trace output on configs that do not have them supported.
> Why do we have that select STACKTRACE there, anyway?

It's too ugly for words, but it does deal with this mess ;-/

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b58f43b..33dbefd 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -25,7 +25,7 @@ config TRACING
 	bool
 	select DEBUG_FS
 	select RING_BUFFER
-	select STACKTRACE
+	select STACKTRACE if STACKTRACE_SUPPORT
 	select TRACEPOINTS
 	select NOP_TRACER
 
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