[android-common:android16-6.12 1/1] mm/page_alloc.c:1831:6: warning: no previous prototype for function 'prep_new_page'

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

Hi Wenchao,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android16-6.12
head:   030ed2af4ba8ba50d5f3cbbc704bc93df568d84e
commit: f2c613bbd9ad3f09e4eb94bf541cdfb57423dcc9 [1/1] ANDROID: export symbol prep_new_page for vendor module
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20260702/202607021102.PWyz2smJ-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 6cc609bb250b21b47fc7d394b4019101e9983597)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260702/202607021102.PWyz2smJ-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/202607021102.PWyz2smJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/page_alloc.c:1831:6: warning: no previous prototype for function 'prep_new_page' [-Wmissing-prototypes]
    1831 | void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
         |      ^
   mm/page_alloc.c:1831:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1831 | void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
         | ^
         | static 
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for INTEL_MEI_ME
   Depends on [n]: X86 && PCI [=y]
   Selected by [m]:
   - INTEL_MEI_HDCP [=m] && (DRM_I915 [=n] || DRM_XE [=m])
   - INTEL_MEI_PXP [=m] && (DRM_I915 [=n] || DRM_XE [=m])


vim +/prep_new_page +1831 mm/page_alloc.c

  1830	
> 1831	void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
  1832								unsigned int alloc_flags)
  1833	{
  1834		post_alloc_hook(page, order, gfp_flags);
  1835	
  1836		if (order && (gfp_flags & __GFP_COMP))
  1837			prep_compound_page(page, order);
  1838	
  1839		/*
  1840		 * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to
  1841		 * allocate the page. The expectation is that the caller is taking
  1842		 * steps that will free more memory. The caller should avoid the page
  1843		 * being used for !PFMEMALLOC purposes.
  1844		 */
  1845		if (alloc_flags & ALLOC_NO_WATERMARKS)
  1846			set_page_pfmemalloc(page);
  1847		else
  1848			clear_page_pfmemalloc(page);
  1849		trace_android_vh_test_clear_look_around_ref(page);
  1850	}
  1851	EXPORT_SYMBOL_GPL(prep_new_page);
  1852	

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