Re: [linux-next:master 9765/10654] drivers/gpu/drm/xe/tests/xe_pci.c:214:2: error: initializer element is not a compile-time constant

[Nathan Chancellor <nathan@kernel.org>]

On Fri, Sep 19, 2025 at 08:46:43PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   8f7f8b1b3f4c613dd886f53f768f82816b41eaa3
> commit: 5bb5258e357eb79719d1c998731b932c945cb52c [9765/10654] drm/xe/tests: Add pre-GMDID IP descriptors to param generators
> config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20250919/202509192041.tQwdE4DS-lkp@intel.com/config)
> compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)

                          ^ key info

> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250919/202509192041.tQwdE4DS-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202509192041.tQwdE4DS-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from drivers/gpu/drm/xe/xe_pci.c:1104:
> >> drivers/gpu/drm/xe/tests/xe_pci.c:214:2: error: initializer element is not a compile-time constant
>            graphics_ip_xelp,
>            ^~~~~~~~~~~~~~~~
>    drivers/gpu/drm/xe/tests/xe_pci.c:221:2: error: initializer element is not a compile-time constant
>            media_ip_xem,
>            ^~~~~~~~~~~~
>    2 errors generated.
> 
> 
> vim +214 drivers/gpu/drm/xe/tests/xe_pci.c
> 
>    206	
>    207	/*
>    208	 * Pre-GMDID Graphics and Media IPs definitions.
>    209	 *
>    210	 * Mimic the way GMDID IPs are declared so the same
>    211	 * param generator can be used for both
>    212	 */
>    213	static const struct xe_ip pre_gmdid_graphics_ips[] = {
>  > 214		graphics_ip_xelp,
>    215		graphics_ip_xelpp,
>    216		graphics_ip_xehpg,
>    217		graphics_ip_xehpc,
>    218	};
>    219	

Prior to Clang 17 (and GCC 8 but that's not as much of a concern now
that this is the minimum supported version for building the kernel),
these structures would not be considered constant:

https://github.com/llvm/llvm-project/issues/44502
https://github.com/llvm/llvm-project/commit/0b2d5b967d98375793897295d651f58f6fbd3034

If this code cannot be modified to use pointers in a similar vein to
commit 17d49b7e47a1 ("power: supply: bq24190_charger: Fix "initializer
element is not constant" error"), this should probably be wrapped in

  #if !defined(CONFIG_CC_IS_CLANG) || CONFIG_CLANG_VERSION >= 170000

Cheers,
Nathan