linux-kernel - Re: v2.6.21-rt1 - bug in asm-mips/atomic.h

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Message-ID: <463A3512.4020508@am.sony.com>
Date:	Thu, 03 May 2007 12:16:34 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: v2.6.21-rt1 - bug in asm-mips/atomic.h

Ingo Molnar wrote:
> i have released the v2.6.20-rt1 kernel...
Ingo,

There appears to be a bug in the patch for include/asm-mips/atomic.h
In the hunk for line 554, it has 2 #endifs.
I think it should only have one.

A portion of the patch reads:

Index: new-linux/include/asm-mips/atomic.h
===================================================================
--- new-linux.orig/include/asm-mips/atomic.h	2007-04-25 20:08:32.000000000 -0700
+++ new-linux/include/asm-mips/atomic.h	2007-04-26 16:15:14.000000000 -0700
@@ -545,7 +554,9 @@
 		: "=&r" (result), "=&r" (temp), "=m" (v->counter)
 		: "Ir" (i), "m" (v->counter)
 		: "memory");
-	} else {
+	}
+#if !defined(CONFIG_NO_SPINLOCK) && !defined(CONFIG_PREEMPT_RT)
+	else {
 		unsigned long flags;

 		raw_local_irq_save(flags);
@@ -554,6 +565,8 @@
 		v->counter = result;
 		raw_local_irq_restore(flags);
 	}
+#endif
+#endif

 	smp_mb();


When I applied the patch to 2.6.21 and tried to compile for MIPS I got:
  CHK     include/linux/utsrelease.h
  CC      arch/mips/kernel/asm-offsets.s
In file included from /home/tbird/work/alp-3.0/alp-linux/include/linux/rt_lock.h:14,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/spinlock.h:116,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/capability.h:45,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/sched.h:47,
                 from /home/tbird/work/alp-3.0/alp-linux/arch/mips/kernel/asm-offsets.c:14:
include2/asm/atomic.h:571: error: expected '(' before 'volatile'
include2/asm/atomic.h:573: error: expected identifier or '(' before 'return'
include2/asm/atomic.h:574: error: expected identifier or '(' before '}' token
include2/asm/atomic.h:576: error: expected declaration specifiers or '...' before 'atomic64_t'
include2/asm/atomic.h: In function 'atomic64_sub_return':
include2/asm/atomic.h:593: error: 'v' undeclared (first use in this function)
include2/asm/atomic.h:593: error: (Each undeclared identifier is reported only once
include2/asm/atomic.h:593: error: for each function it appears in.)
include2/asm/atomic.h:585: error: invalid lvalue in asm output 2
include2/asm/atomic.h:585: error: memory input 4 is not directly addressable
include2/asm/atomic.h:599: error: invalid lvalue in asm output 2
include2/asm/atomic.h:599: error: memory input 4 is not directly addressable
include2/asm/atomic.h: At top level:
include2/asm/atomic.h:638: error: expected declaration specifiers or '...' before 'atomic64_t'
include2/asm/atomic.h: In function 'atomic64_sub_if_positive':
include2/asm/atomic.h:659: error: 'v' undeclared (first use in this function)
include2/asm/atomic.h:647: error: invalid lvalue in asm output 2
include2/asm/atomic.h:647: error: memory input 4 is not directly addressable
include2/asm/atomic.h:665: error: invalid lvalue in asm output 2
include2/asm/atomic.h:665: error: memory input 4 is not directly addressable
In file included from /home/tbird/work/alp-3.0/alp-linux/include/linux/rt_lock.h:14,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/spinlock.h:116,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/capability.h:45,
                 from /home/tbird/work/alp-3.0/alp-linux/include/linux/sched.h:47,
                 from /home/tbird/work/alp-3.0/alp-linux/arch/mips/kernel/asm-offsets.c:14:
include2/asm/atomic.h:779:2: error: #endif without #if

After removing the second #endif in the second hunk above, things compiled better.
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Electronics
=============================

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