linux-kernel - Re: [BUG] next-20081216 - WARNING: at kernel/smp.c:333 smp_call_function

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Date:	Wed, 24 Dec 2008 12:34:41 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	mingo@...e.hu, mel@....ul.ie
Subject: Re: [BUG] next-20081216 - WARNING: at kernel/smp.c:333	smp_call_function_mask

Kamalesh Babulal wrote:
> * Yinghai Lu <yinghai@...nel.org> [2008-12-23 13:09:56]:
> 
> 
> boot log after applying the debug patch
> 
> root (hd0,0)
>  Filesystem type is ext2fs, partition type 0x83
> kernel /vmlinuz-autotest root=/dev/mapper/VolGroup00-LogVol00 ro console=tty0 c
> onsole=ttyS1,19200 selinux=no debug IDENT=1230133532
>    [Linux-bzImage, setup=0x3000, size=0x273cf0]
> initrd /initrd-autotest
>    [Linux-initrd @ 0x37e5f000, 0x19097a bytes]
> 
> Linux version 2.6.28-rc8-autotest-tip (root@...-13.ltc.austin.ibm.com) (gcc version 4.1.1 20060525 (Red Hat 4.1.1-1)) #1 SMP Wed Dec 24 09:37:30 CST 2008
> Command line: root=/dev/mapper/VolGroup00-LogVol00 ro console=tty0 console=ttyS1,19200 selinux=no debug IDENT=1230133532

ok, it seems that your compiler is broken... is that RHEL 5.1 stock compiler

YH


[PATCH] sparseirq: add oninline to workaround compiler

Impact: fix panic on null pointer with sparseirq

some compiler seems to inline the weak global function.
try to workaround it

also remove duplicated arch_early_irq_init()
already have one weak copy in init/main.c

Signed-off-by: Yinghai <yinghai@...nel.org>

---
 init/main.c         |    4 ++--
 kernel/irq/handle.c |    6 +-----
 2 files changed, 3 insertions(+), 7 deletions(-)

Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c
+++ linux-2.6/init/main.c
@@ -542,11 +542,11 @@ void __init __weak thread_info_cache_ini
 {
 }
 
-void __init __weak arch_early_irq_init(void)
+void noinline __init __weak arch_early_irq_init(void)
 {
 }
 
-void __init __weak early_irq_init(void)
+void noinline __init __weak early_irq_init(void)
 {
 	arch_early_irq_init();
 }
Index: linux-2.6/kernel/irq/handle.c
===================================================================
--- linux-2.6.orig/kernel/irq/handle.c
+++ linux-2.6/kernel/irq/handle.c
@@ -56,10 +56,6 @@ void handle_bad_irq(unsigned int irq, st
 int nr_irqs = NR_IRQS;
 EXPORT_SYMBOL_GPL(nr_irqs);
 
-void __init __attribute__((weak)) arch_early_irq_init(void)
-{
-}
-
 #ifdef CONFIG_SPARSE_IRQ
 static struct irq_desc irq_desc_init = {
 	.irq	    = -1,
@@ -90,7 +86,7 @@ void init_kstat_irqs(struct irq_desc *de
 		desc->kstat_irqs = (unsigned int *)ptr;
 }
 
-void __attribute__((weak)) arch_init_chip_data(struct irq_desc *desc, int cpu)
+void noinline __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
 {
 }
 
--
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