[rppt:pks/v0.0 25/27] mm/page_alloc.c:5532:9: error: implicit declaration of function 'set_memory_4k'; did you mean 'set_memory_nx'?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git pks/v0.0
head:   b1ddb6750818e99c719da2f60b21e5752f43f0e7
commit: c215b60b24418f8dff21de57333f066ebfb30b93 [25/27] mm/page_alloc: add MIGRATE_PTE_MAPPED and __GFP_PTE_MAPPED_2
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/commit/?id=c215b60b24418f8dff21de57333f066ebfb30b93
        git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git
        git fetch --no-tags rppt pks/v0.0
        git checkout c215b60b24418f8dff21de57333f066ebfb30b93
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   mm/page_alloc.c:3934:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes]
    3934 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
         |               ^~~~~~~~~~~~~~~~~~~~~~
   mm/page_alloc.c: In function '__alloc_pages':
>> mm/page_alloc.c:5532:9: error: implicit declaration of function 'set_memory_4k'; did you mean 'set_memory_nx'? [-Werror=implicit-function-declaration]
    5532 |   err = set_memory_4k(addr, nr_pages);
         |         ^~~~~~~~~~~~~
         |         set_memory_nx
   cc1: some warnings being treated as errors


vim +5532 mm/page_alloc.c

  5457	
  5458	/*
  5459	 * This is the 'heart' of the zoned buddy allocator.
  5460	 */
  5461	struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
  5462								nodemask_t *nodemask)
  5463	{
  5464		struct page *page;
  5465		unsigned int alloc_flags = ALLOC_WMARK_LOW;
  5466		gfp_t alloc_gfp; /* The gfp_t that was actually used for allocation */
  5467		struct alloc_context ac = { };
  5468	
  5469		/*
  5470		 * There are several places where we assume that the order value is sane
  5471		 * so bail out early if the request is out of bound.
  5472		 */
  5473		if (unlikely(order >= MAX_ORDER)) {
  5474			WARN_ON_ONCE(!(gfp & __GFP_NOWARN));
  5475			return NULL;
  5476		}
  5477	
  5478		gfp &= gfp_allowed_mask;
  5479		/*
  5480		 * Apply scoped allocation constraints. This is mainly about GFP_NOFS
  5481		 * resp. GFP_NOIO which has to be inherited for all allocation requests
  5482		 * from a particular context which has been marked by
  5483		 * memalloc_no{fs,io}_{save,restore}. And PF_MEMALLOC_PIN which ensures
  5484		 * movable zones are not used during allocation.
  5485		 */
  5486		gfp = current_gfp_context(gfp);
  5487		alloc_gfp = gfp;
  5488		if (!prepare_alloc_pages(gfp, order, preferred_nid, nodemask, &ac,
  5489				&alloc_gfp, &alloc_flags))
  5490			return NULL;
  5491	
  5492		if ((alloc_gfp & __GFP_PTE_MAPPED) && order == 0) {
  5493			page = alloc_page_pte_mapped(alloc_gfp);
  5494			if (page)
  5495				goto out;
  5496		}
  5497	
  5498		/*
  5499		 * Forbid the first pass from falling back to types that fragment
  5500		 * memory until all local zones are considered.
  5501		 */
  5502		alloc_flags |= alloc_flags_nofragment(ac.preferred_zoneref->zone, gfp);
  5503	
  5504		/* First allocation attempt */
  5505		page = get_page_from_freelist(alloc_gfp, order, alloc_flags, &ac);
  5506		if (likely(page))
  5507			goto out;
  5508	
  5509		alloc_gfp = gfp;
  5510		ac.spread_dirty_pages = false;
  5511	
  5512		/*
  5513		 * Restore the original nodemask if it was potentially replaced with
  5514		 * &cpuset_current_mems_allowed to optimize the fast-path attempt.
  5515		 */
  5516		ac.nodemask = nodemask;
  5517	
  5518		page = __alloc_pages_slowpath(alloc_gfp, order, &ac);
  5519	
  5520	out:
  5521		if (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT) && page &&
  5522		    unlikely(__memcg_kmem_charge_page(page, gfp, order) != 0)) {
  5523			__free_pages(page, order);
  5524			page = NULL;
  5525		}
  5526	
  5527		if (gfp & __GFP_PTE_MAPPED_2) {
  5528			unsigned long addr = (unsigned long)page_address(page);
  5529			unsigned long nr_pages = (1 << order);
  5530			int err;
  5531	
> 5532			err = set_memory_4k(addr, nr_pages);
  5533			if (err) {
  5534				/* FIXME: reset pageblock migratetype */
  5535				/* set_pageblock_migratetype(old_mt) */
  5536				__free_pages(page, order);
  5537				page = NULL;
  5538			}
  5539	
  5540			/* FIXME: should we flush TLB here or later? */
  5541			/* flush_tlb_kernel_range(addr, addr + PAGE_SIZE * nr_pages); */
  5542		}
  5543	
  5544		trace_mm_page_alloc(page, order, alloc_gfp, ac.migratetype);
  5545	
  5546		return page;
  5547	}
  5548	EXPORT_SYMBOL(__alloc_pages);
  5549	

---
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