Re: [PATCH] ARM: make CONFIG_DEBUG_WX depend on MMU

[Laura Abbott]

On 02/20/2018 07:09 AM, Arnd Bergmann wrote:
> Without CONFIG_MMU, this results in a build failure:
>
> ./arch/arm/include/asm/memory.h:92:23: error: initializer element is not constant
>   #define VECTORS_BASE  vectors_base
> arch/arm/mm/dump.c:32:4: note: in expansion of macro 'VECTORS_BASE'
>    { VECTORS_BASE, "Vectors" },
>
> arch/arm/mm/dump.c:71:11: error: 'L_PTE_USER' undeclared here (not in a function); did you mean 'VTIME_USER'?
>     .mask = L_PTE_USER,
>             ^~~~~~~~~~
>
> Obviously the feature only makes sense with an MMU, so let's add the
> dependency here.

Acked-by: Laura Abbott <labbott@xxxxxxxxxx>

> Fixes: a8e53c151fe7 ("ARM: 8737/1: mm: dump: add checking for writable and executable")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>   arch/arm/Kconfig.debug | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index 7b3d9c5c73bb..6db106b5b9e9 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -22,6 +22,7 @@ config ARM_PTDUMP_DEBUGFS
>   
>   config DEBUG_WX
>   	bool "Warn on W+X mappings at boot"
> +	depends on MMU
>   	select ARM_PTDUMP_CORE
>   	---help---
>   		Generate a warning if any W+X mappings are found at boot.