* Sam Ravnborg <sam@xxxxxxxxxxxx> [2008-12-26 11:27:16]:
> On Fri, Dec 26, 2008 at 02:05:47AM -0800, Yinghai Lu wrote:
> > Kamalesh Babulal wrote:
> > > * Yinghai Lu <yinghai@xxxxxxxxxx> [2008-12-24 12:34:41]:
> > >
> > >> --
> > >
> > > After the applying the patch, the kernel panic's with the same backtrace. The
> > > box is running Fedora 5 on it.
> > >
> >
> > please try...
> > Ingo, do we need to switch to use #idef and inline function instead?
>
> I recall David Howells had a similar issue with the bootparamter patch set.
> The workaround he used was to add a barrier(); call in the weak function
> to avoid the inline.
>
> [full context kept as I added David to to: list].
> Sam
>
Hi Yinghai,
Thanks, after applying the patch, the kernel boot's up fine.
> >
> > YH
> >
> >
> > [PATCH] sparseirq: add printk to workaround compiler optimizing
> >
> > 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@xxxxxxxxxx>
> >
> > ---
> > init/main.c | 2 ++
> > kernel/irq/handle.c | 7 ++-----
> > 2 files changed, 4 insertions(+), 5 deletions(-)
> >
> > Index: linux-2.6/init/main.c
> > ===================================================================
> > --- linux-2.6.orig/init/main.c
> > +++ linux-2.6/init/main.c
> > @@ -544,10 +544,12 @@ void __init __weak thread_info_cache_ini
> >
> > void __init __weak arch_early_irq_init(void)
> > {
> > + printk(KERN_DEBUG "calling __weak arch_early_irq_init\n");
> > }
> >
> > void __init __weak early_irq_init(void)
> > {
> > + printk(KERN_DEBUG "calling __weak early_irq_init\n");
> > 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,
> > @@ -90,8 +86,9 @@ 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 __weak arch_init_chip_data(struct irq_desc *desc, int cpu)
> > {
> > + printk(KERN_DEBUG "calling __weak arch_init_chip_data\n");
> > }
> >
> > static void init_one_irq_desc(int irq, struct irq_desc *desc, int cpu)
> > --
--
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
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