linux-kernel - Re: [RESEND PATCH v6 2/4] mm: move is_kernel

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Date:   Tue, 16 Oct 2018 12:53:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v6 2/4] mm: move is_kernel_rodata() to
 asm-generic/sections.h

On Sun, Oct 14, 2018 at 05:20:08PM +0200, Bartosz Golaszewski wrote:
> Export this routine so that we can use it later in devm_kstrdup_const()
> and devm_kfree().
> 
> Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Acked-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> Acked-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  include/asm-generic/sections.h | 14 ++++++++++++++
>  mm/util.c                      |  7 -------
>  2 files changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
> index 849cd8eb5ca0..d79abca81a52 100644
> --- a/include/asm-generic/sections.h
> +++ b/include/asm-generic/sections.h
> @@ -141,4 +141,18 @@ static inline bool init_section_intersects(void *virt, size_t size)
>  	return memory_intersects(__init_begin, __init_end, virt, size);
>  }
>  
> +/**
> + * is_kernel_rodata - checks if the pointer address is located in the
> + *                    .rodata section
> + *
> + * @addr: address to check
> + *
> + * Returns: true if the address is located in .rodata, false otherwise.
> + */
> +static inline bool is_kernel_rodata(unsigned long addr)
> +{
> +	return addr >= (unsigned long)__start_rodata &&
> +	       addr < (unsigned long)__end_rodata;

Those symbols are not exported, are you sure this is going to work for a
kernel module that ends up using this function?

I'll take it, but be aware of the future complications that might happen
here...

thanks,

greg k-h