linux-kernel - Re: [PATCHv3 4/7] powerpc64: Add .opd based function descriptor dereference

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Date:   Thu, 19 Oct 2017 23:01:06 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        James Bottomley <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jessica Yu <jeyu@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 4/7] powerpc64: Add .opd based function descriptor
 dereference

Hello,

Michael, sorry for the delay. I'm catching up with the emails
after... absence.

On (10/04/17 22:06), Michael Ellerman wrote:
> Petr Mladek <pmladek@...e.com> writes:
> > On Sat 2017-09-30 11:53:16, Sergey Senozhatsky wrote:
> >> diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
> >> index 0b0f89685b67..94caec045a90 100644
> >> --- a/arch/powerpc/kernel/module_64.c
> >> +++ b/arch/powerpc/kernel/module_64.c
> >> @@ -712,6 +717,17 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
> >>  	return 0;
> >>  }
> >>  
> >> +#ifdef PPC64_ELF_ABI_v1
> >> +unsigned long dereference_module_function_descriptor(struct module *mod,
> >> +						     unsigned long addr)
> >> +{
> >> +	if (addr < mod->arch.start_opd || addr >= mod->arch.end_opd)
> >> +		return addr;
> >> +
> >> +	return dereference_function_descriptor(addr);
> >> +}
> >> +#endif /* PPC64_ELF_ABI_v1 */
> >
> > I would personally move this up in the source file. It is related to
> > the definition of func_desc() and other functions that are
> > also PPC_ELF_ABI-specific.
> 
> Yeah that would be neater. There's already a PPC64_ELF_ABI_v2 block, you
> could put this in the else case of that.
> 
> But we can do that later if you're not respinning otherwise.

will do.

	-ss