Re: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI

[kernel test robot <lkp@intel.com>]

Hi Brendan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bf2602a3cb2381fb1a04bf1c39a290518d2538d1]

url:    https://github.com/intel-lab-lkp/linux/commits/Brendan-Jackman/x86-mm-asi-Add-CONFIG_MITIGATION_ADDRESS_SPACE_ISOLATION/20250924-230633
base:   bf2602a3cb2381fb1a04bf1c39a290518d2538d1
patch link:    https://lore.kernel.org/r/20250924-b4-asi-page-alloc-v1-5-2d861768041f%40google.com
patch subject: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI
config: x86_64-buildonly-randconfig-002-20250925 (https://download.01.org/0day-ci/archive/20250925/202509252153.JhjsdZ6c-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250925/202509252153.JhjsdZ6c-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/202509252153.JhjsdZ6c-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/mm/pat/set_memory.c: In function 'mirror_asi_direct_map':
>> arch/x86/mm/pat/set_memory.c:1995:25: warning: variable 'asi_cpa' set but not used [-Wunused-but-set-variable]
    1995 |         struct cpa_data asi_cpa = *cpa;
         |                         ^~~~~~~


vim +/asi_cpa +1995 arch/x86/mm/pat/set_memory.c

  1988	
  1989	/*
  1990	 * Having updated the unrestricted PGD, reflect this change in the ASI
  1991	 * restricted address space too.
  1992	 */
  1993	static inline int mirror_asi_direct_map(struct cpa_data *cpa, int primary)
  1994	{
> 1995		struct cpa_data asi_cpa = *cpa;
  1996	
  1997		if (!asi_enabled_static())
  1998			return 0;
  1999	
  2000		/* Only need to do this for the real unrestricted direct map. */
  2001		if ((cpa->pgd && cpa->pgd != init_mm.pgd) || !is_direct_map(*cpa->vaddr))
  2002			return 0;
  2003		VM_WARN_ON_ONCE(!is_direct_map(*cpa->vaddr + (cpa->numpages * PAGE_SIZE)));
  2004	
  2005		asi_cpa.pgd = asi_nonsensitive_pgd;
  2006		asi_cpa.curpage = 0;
  2007		return __change_page_attr(cpa, primary);
  2008	}
  2009	

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