linux-kernel - Re: [PATCH v2 2/8] powerpc/module: Only try to generate the ftrace

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Date:	Wed, 02 Mar 2016 12:52:44 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Torsten Duwe <duwe@....de>
Cc:	linuxppc-dev@...abs.org, bsingharora@...il.com,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	kamalesh@...ux.vnet.ibm.com, pmladek@...e.com, jeyu@...hat.com,
	jkosina@...e.cz, live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [PATCH v2 2/8] powerpc/module: Only try to generate the
 ftrace_caller() stub once

On Tue, 2016-03-01 at 13:00 +0100, Torsten Duwe wrote:
> On Mon, Feb 29, 2016 at 08:26:23PM +1100, Michael Ellerman wrote:
> [...]
> > diff --git a/arch/powerpc/kernel/module_32.c b/arch/powerpc/kernel/module_32.c
> > index 2c01665eb410..dd095496d225 100644
> > --- a/arch/powerpc/kernel/module_32.c
> > +++ b/arch/powerpc/kernel/module_32.c
> > @@ -294,11 +294,19 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
> >  			return -ENOEXEC;
> >  		}
> >  	}
> > +
> > +	return 0;
> > +}
> > +
> >  #ifdef CONFIG_DYNAMIC_FTRACE
> > -	module->arch.tramp =
> > -		do_plt_call(module->core_layout.base,
> > -			    (unsigned long)ftrace_caller,
> > -			    sechdrs, module);
> > -#endif
> > +int module_finalize_ftrace(struct module *module, const Elf_Shdr *sechdrs)
> > +{
> > +	module->arch.tramp = do_plt_call(module->core_layout.base,
> > +					 (unsigned long)ftrace_caller,
> > +					 sechdrs, module);
> > +	if (!mod->arch.tramp)
>
> That should probably read (!module->arch.tramp).

Hah, you expect me to compile my patches?! :)

cheers