[PATCH 5/7] ftrace, PPC64: handle module trampolines for dyn ftrace

[Steven Rostedt]

On Mon, 17 Nov 2008, Paul Mackerras wrote:

> Steven Rostedt writes:
> 
> > +	if (!rec->arch.mod) {
> > +		if (!mod) {
> > +			printk(KERN_ERR "No module loaded addr=%lx\n",
> > +			       addr);
> > +			return -EFAULT;
> > +		}
> > +		rec->arch.mod = mod;
> > +	} else if (mod) {
> > +		printk(KERN_ERR
> > +		       "Record mod %p not equal to passed in mod %p\n",
> > +		       rec->arch.mod, mod);
> > +		return -EINVAL;
> 
> That looks wrong; surely you need an if (mod != rec->arch.mod)
> somewhere here?

BTW, the reason this still worked was because only the first instance 
passes in mod (when rec->arch.mod does not exist). After that, mod is 
NULL, so we never enter this case. But still, I will need to fix this 
(even though I thought I did).

-- Steve