[android-common:android15-6.6 2/2] mm/page_alloc.c:1729:6: warning: no previous prototype for 'prep_new_page'

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

tree:   https://android.googlesource.com/kernel/common android15-6.6
head:   067e5e6bd6445f97dfbbf71bc3693d1bea71972d
commit: 3eb552620ce010b786bdc76a74722b9339d9c0ba [2/2] ANDROID: export symbols for vendor module
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20260704/202607041026.SYysmHf4-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260704/202607041026.SYysmHf4-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/202607041026.SYysmHf4-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/page_alloc.c:1729:6: warning: no previous prototype for 'prep_new_page' [-Wmissing-prototypes]
    1729 | void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
         |      ^~~~~~~~~~~~~


vim +/prep_new_page +1729 mm/page_alloc.c

  1728	
> 1729	void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
  1730								unsigned int alloc_flags)
  1731	{
  1732		post_alloc_hook(page, order, gfp_flags);
  1733	
  1734		if (order && (gfp_flags & __GFP_COMP))
  1735			prep_compound_page(page, order);
  1736	
  1737		/*
  1738		 * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to
  1739		 * allocate the page. The expectation is that the caller is taking
  1740		 * steps that will free more memory. The caller should avoid the page
  1741		 * being used for !PFMEMALLOC purposes.
  1742		 */
  1743		if (alloc_flags & ALLOC_NO_WATERMARKS)
  1744			set_page_pfmemalloc(page);
  1745		else
  1746			clear_page_pfmemalloc(page);
  1747		trace_android_vh_test_clear_look_around_ref(page);
  1748	}
  1749	EXPORT_SYMBOL_GPL(prep_new_page);
  1750	

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