Re: [PATCH 7/7] modpost: handle relocations mismatch in __ex_table.

From: Quentin Casasnovas
Date: Wed Apr 15 2015 - 04:34:07 EST


On Wed, Apr 15, 2015 at 12:57:37PM +0930, Rusty Russell wrote:
>
> I've applied his patch, then the following:

Thanks.

>
> modpost: handle -ffunction-sections
>
> 52dc0595d540 introduced OTHER_TEXT_SECTIONS for identifying what
> sections could validly have __ex_table entries. Unfortunately, it
> wasn't tested with -ffunction-sections, which some architectures
> use.
>
> Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
> Cc: Quentin Casasnovas <quentin.casasnovas@xxxxxxxxxx>
> Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index cbd53e08769d..22dbc604cdb9 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -876,7 +876,7 @@ static void check_section(const char *modname, struct elf_info *elf,
> #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
> ".kprobes.text"
> #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
> - ".fixup", ".entry.text"
> + ".fixup", ".entry.text", ".exception.text", ".text.*"
>

Is there a reason we're not adding ".text.*" to TEXT_SECTIONS as opposed to
OTHER_TEXT_SECTIONS? AFAIU, we'll not run the other modpost mismatch
checks when the kernel is compiled with -ffunction-sections otherwise.

I'll send a tentative fix for the divide-by-zero error shortly, sorry about
the mess.

Quentin
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