linux-kernel - Re: [PATCH] ARM: dyndbg: allow including dyndbg.h in decompressor

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Date:   Fri, 10 Mar 2023 10:29:31 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Vincenzo Palazzo <vincenzopalazzodev@...il.com>,
        Jason Baron <jbaron@...mai.com>, Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dyndbg: allow including dyndbg.h in decompressor

On Fri, Mar 10, 2023 at 03:01:26PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> After a change to linux/module.h, dyndbg.h is now included
> indirectly from the decompressor for lz4 support, which in turn
> causes a build failure on 32-bit Arm:
> 
> In file included from include/linux/module.h:30,
>                  from arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:39,
>                  from arch/arm/boot/compressed/../../../../lib/decompress_unlz4.c:10,
>                  from arch/arm/boot/compressed/decompress.c:59:
> include/linux/dynamic_debug.h: In function 'ddebug_dyndbg_module_param_cb':
> include/linux/dynamic_debug.h:307:14: error: implicit declaration of function 'strcmp' [-Werror=implicit-function-declaration]
>   307 |         if (!strcmp(param, "dyndbg")) {
>       |              ^~~~~~
> include/linux/dynamic_debug.h:1:1: note: 'strcmp' is defined in header '<string.h>'; did you forget to '#include <string.h>'?
>   +++ |+#include <string.h>
> 
> The decompressor has its own replacement for the linux/string.h contents,
> so the normal declaration is not visible here. Since the function is
> not actually called, it is sufficient to add a declaration, and this
> is in fact the correct one as it matches the definition in
> arch/arm/boot/compressed/string.c.
> 
> Fixes: 7deabd674988 ("dyndbg: use the module notifier callbacks")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> The patch that caused the problem is in linux-next, maybe fold
> the fix into that patch if possible
> ---

Thanks for figuring this out, Arnd! Pushed to modules-next!

  Luis