[android-common:android15-6.6-2026-07 0/1] fs/proc/task_mmu.c:1858:8: warning: no previous prototype for '__pagemap_lseek'

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

Hi Kalesh,

FYI, the error/warning still remains.

tree:   https://android.googlesource.com/kernel/common android15-6.6-2026-07
head:   5556e039c32fa02b239611dc8e5ebb958a7f12e1
commit: 0715c0e2078d5e9bf1b2da50fae4a738cd346016 [0/1] ANDROID: 16K: Emulate /proc/pid/pagemap
config: i386-randconfig-003-20260702 (https://download.01.org/0day-ci/archive/20260702/202607021122.C8sowvZw-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/20260702/202607021122.C8sowvZw-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/202607021122.C8sowvZw-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/proc/task_mmu.c:1858:8: warning: no previous prototype for '__pagemap_lseek' [-Wmissing-prototypes]
    1858 | loff_t __pagemap_lseek(struct file *file, loff_t offset, int orig)
         |        ^~~~~~~~~~~~~~~


vim +/__pagemap_lseek +1858 fs/proc/task_mmu.c

  1857	
> 1858	loff_t __pagemap_lseek(struct file *file, loff_t offset, int orig)
  1859	{
  1860		unsigned long nr_subpages = __PAGE_SIZE / PAGE_SIZE;
  1861		loff_t ret;
  1862	
  1863		/*
  1864		 * Userspace thinks the pages are larger than they actually are, so adjust the
  1865		 * offset to compensate.
  1866		 */
  1867		offset *= nr_subpages;
  1868	
  1869		ret = mem_lseek(file, offset, orig);  /* borrow this */
  1870		if (ret < 0)
  1871			return offset;
  1872	
  1873		/* Re-adjust the offset to reflect the larger userspace page size. */
  1874		return ret / nr_subpages;
  1875	}
  1876	

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