Re: [PATCH v3 10/13] arch: make execmem setup available regardless of CONFIG_MODULES

[Arnd Bergmann]

On Mon, Sep 18, 2023, at 09:29, Mike Rapoport wrote:
> index a42e4cd11db2..c0b536e398b4 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> +#ifdef CONFIG_XIP_KERNEL
> +/*
> + * The XIP kernel text is mapped in the module area for modules and
> + * some other stuff to work without any indirect relocations.
> + * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
> + * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned 
> on/off.
> + */
> +#undef MODULES_VADDR
> +#define MODULES_VADDR	(((unsigned long)_exiprom + ~PMD_MASK) & 
> PMD_MASK)
> +#endif
> +
> +#if defined(CONFIG_MMU) && defined(CONFIG_EXECMEM)
> +static struct execmem_params execmem_params __ro_after_init = {
> +	.ranges = {
> +		[EXECMEM_DEFAULT] = {
> +			.start = MODULES_VADDR,
> +			.end = MODULES_END,
> +			.alignment = 1,
> +		},

This causes a randconfig build failure for me on linux-next now:

arch/arm/mm/init.c:499:25: error: initializer element is not constant
  499 | #define MODULES_VADDR   (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
      |                         ^
arch/arm/mm/init.c:506:34: note: in expansion of macro 'MODULES_VADDR'
  506 |                         .start = MODULES_VADDR,
      |                                  ^~~~~~~~~~~~~
arch/arm/mm/init.c:499:25: note: (near initialization for 'execmem_params.ranges[0].start')
  499 | #define MODULES_VADDR   (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
      |                         ^
arch/arm/mm/init.c:506:34: note: in expansion of macro 'MODULES_VADDR'
  506 |                         .start = MODULES_VADDR,
      |                                  ^~~~~~~~~~~~~

I have not done any analysis on the issue so far, I hope
you can see the problem directly. See
https://pastebin.com/raw/xVqAyakH for a .config that runs into
this problem with gcc-13.2.0.

      Arnd