Re: [PATCH] Only process_die notifier in ia64_do_page_fault if KPROBES is configured.

From: Christoph Lameter <clameter_at_engr.sgi.com>
Date: 2005-09-20 04:22:04
On Tue, 30 Aug 2005, Matthew Wilcox wrote:

> On Mon, Aug 29, 2005 at 05:19:05PM -0700, Rusty Lynch wrote:
> > So, assuming inlining the notifier_call_chain would address Christoph's
> > conserns, is the following patch something like what you are sugesting?  
> > This would make all the kdebug.h::notify_die() calls use the inline version. 
> 
> I think we need something more like this ...
> 
> include/linux/notifier.h:
> +static inline int notifier_call_chain(struct notifier_block **n,
> +					unsigned long val, void *v)
> +{
> +	if (n)
> +		return __notifier_call_chain(n, val, v);
> +	return NOTIFY_DONE;
> +}
> kernel/sys.c:
> -int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
> +int __notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
> -EXPORT_SYMBOL(notifier_call_chain);
> +EXPORT_SYMBOL(__notifier_call_chain);
> 
> That way everyone gets both the quick test and the global size reduction.

And then do

#ifndef CONFIG_KPROBES

#define ia64die_chain 0

#endif

in include/asm-ia64/kdebug.h?

Otherwise we still check a notifier chain that cannot ever be 
activated.

But then the patch is essentially the same as the last one I proposed.

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Received on Tue Sep 20 04:24:23 2005

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