linux-kernel - Re: [PATCH] module: add stub for within

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Message-ID: <CAKwvOdmBa-Ckk4wnp4OEPNdxeYSxEhzddykuWWGG1Wi6JEGDwA@mail.gmail.com>
Date:   Mon, 8 Apr 2019 11:08:16 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Tri Vo <trong@...roid.com>, Jessica Yu <jeyu@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>
Cc:     Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Hackmann <ghackmann@...roid.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        kbuild-all@...org, kbuild test robot <lkp@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Petri Gynther <pgynther@...gle.com>
Subject: Re: [PATCH] module: add stub for within_module

On Sat, Apr 6, 2019 at 7:26 PM Tri Vo <trong@...roid.com> wrote:
>
> Provide a stub for within_module() when CONFIG_MODULES is not set. This
> is needed to build CONFIG_GCOV_KERNEL.
>
> Fixes: 8c3d220cb6b5 ("gcov: clang support")

The above commit got backed out of the -mm tree, due to the issue this
patch addresses, so not sure it provides the correct context for the
patch.  Maybe that line in the commit message should be dropped?

> Suggested-by: Matthew Wilcox <willy@...radead.org>
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kbuild test robot <lkp@...el.com>
> Link: https://marc.info/?l=linux-mm&m=155384681109231&w=2
> Signed-off-by: Tri Vo <trong@...roid.com>
> ---
>  include/linux/module.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 5bf5dcd91009..47190ebb70bf 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -709,6 +709,11 @@ static inline bool is_module_text_address(unsigned long addr)
>         return false;
>  }
>
> +static inline bool within_module(unsigned long addr, const struct module *mod)
> +{
> +       return false;
> +}
> +

Do folks think that similar stubs for within_module_core and
within_module_init should be added, while we're here?

It looks like kernel/trace/ftrace.c uses them, but has proper
CONFIG_MODULE guards.

>  /* Get/put a kernel symbol (calls should be symmetric) */
>  #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
>  #define symbol_put(x) do { } while (0)
> --
> 2.21.0.392.gf8f6787159e-goog
>


-- 
Thanks,
~Nick Desaulniers