linux-kernel - Re: [PATCH v4 01/10] crash_dump: Make elfcorehdr

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Date:   Wed, 14 Jul 2021 07:46:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nick Kossifidis <mick@....forth.gr>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Frank Rowand <frowand.list@...il.com>,
        Dave Young <dyoung@...hat.com>,
        Mike Rapoport <rppt@...nel.org>, Baoquan He <bhe@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kexec@...ts.infradead.org,
        linux-mm@...ck.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/10] crash_dump: Make elfcorehdr_{addr,size} always
 visible

On Wed, Jul 14, 2021 at 02:50:11PM +0200, Geert Uytterhoeven wrote:
> Make the forward declarations of elfcorehdr_addr and elfcorehdr_size
> always available, like is done for phys_initrd_start and
> phys_initrd_size.  Code referring to these symbols can then just check
> for IS_ENABLED(CONFIG_CRASH_DUMP), instead of requiring conditional
> compilation using an #ifdef, thus preparing to increase compile
> coverage.
> 
> Suggested-by: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v4:
>   - New.
> ---
>  include/linux/crash_dump.h | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
> index a5192b718dbe4f9a..ad31893d13d634de 100644
> --- a/include/linux/crash_dump.h
> +++ b/include/linux/crash_dump.h
> @@ -10,13 +10,14 @@
>  
>  #include <linux/pgtable.h> /* for pgprot_t */
>  
> +/* For IS_ENABLED(CONFIG_CRASH_DUMP) */
> +extern unsigned long long elfcorehdr_addr;
> +extern unsigned long long elfcorehdr_size;
> +
>  #ifdef CONFIG_CRASH_DUMP
>  #define ELFCORE_ADDR_MAX	(-1ULL)
>  #define ELFCORE_ADDR_ERR	(-2ULL)

Seems like these could be needed and no need to hide them, so perhaps 
just move the #ifdef down.

>  
> -extern unsigned long long elfcorehdr_addr;
> -extern unsigned long long elfcorehdr_size;
> -
>  extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
>  extern void elfcorehdr_free(unsigned long long addr);
>  extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
> -- 
> 2.25.1
> 
>