linux-kernel - Re: 2.6.18-rt1

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Message-Id: <1159483731.25415.12.camel@localhost>
Date:	Thu, 28 Sep 2006 15:48:51 -0700
From:	john stultz <johnstul@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"K.R. Foley" <kr@...sft.com>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: 2.6.18-rt1

On Wed, 2006-09-27 at 17:42 -0700, john stultz wrote:
> On Fri, 2006-09-22 at 13:58 +0200, Ingo Molnar wrote: 
> > * john stultz <johnstul@...ibm.com> wrote:
> > 
> > > I'm seeing a similar issue. Although the log is a bit futzed. Maybe 
> > > its the sd_mod?
> > > 
> > >  at virtual address 75010000le kernel paging requestproc filesystem
> > 
> > would be nice to figure out why it crashes - unfortunately i cannot 
> > trigger it. Could it be some build tool incompatibility perhaps? Some 
> > sizing issue (some module struct gets too large)?
> 
> Been looking a bit deeper into this again:
[snip]
> c03879e8 r __ksymtab_find_next_bit
> c03879f0 r __ksymtab_find_next_zero_bit
> c03879f8 R __write_lock_failed
> c0387a18 R __read_lock_failed
> c0387a2c r __ksymtab___delay
> c0387a34 r __ksymtab___const_udelay
> c0387a3c r __ksymtab___udelay
> c0387a44 r __ksymtab___ndelay
> 
> That __read/__write_lock_failed bit looks wrong.


So it seems gcc 3.4.4 misplaces the __write_lock_failed function into
the ksymtab. It doesn't happen w/ 4.0.3. 

Anyway, this patch explicitly defines the section and fixes the issue
for me. Would the other reporters of this issue give it a whirl as well?

thanks
-john


Index: linux-rtj14/arch/i386/lib/bitops.c
===================================================================
--- linux-rtj14.orig/arch/i386/lib/bitops.c	2006-09-28 15:24:08.000000000 -0700
+++ linux-rtj14/arch/i386/lib/bitops.c	2006-09-28 15:35:29.000000000 -0700
@@ -75,6 +75,7 @@
  */
 #ifdef CONFIG_SMP
 asm(
+".section .sched.text\n"
 ".align	4\n"
 ".globl	__write_lock_failed\n"
 "__write_lock_failed:\n\t"
@@ -88,6 +89,7 @@
 );
 
 asm(
+".section .sched.text\n"
 ".align	4\n"
 ".globl	__read_lock_failed\n"
 "__read_lock_failed:\n\t"


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