Hi Joel, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20181102] url: https://github.com/0day-ci/linux/commits/Joel-Fernandes/Add-support-for-fast-mremap/20181103-224908 config: xtensa-allmodconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 8.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=8.1.0 make.cross ARCH=xtensa All errors (new ones prefixed by >>): mm/mremap.c: In function 'move_normal_pmd': >> mm/mremap.c:229:2: error: implicit declaration of function 'set_pmd_at'; did you mean 'set_pte_at'? [-Werror=implicit-function-declaration] set_pmd_at(mm, new_addr, new_pmd, pmd); ^~~~~~~~~~ set_pte_at cc1: some warnings being treated as errors vim +229 mm/mremap.c 193 194 static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr, 195 unsigned long new_addr, unsigned long old_end, 196 pmd_t *old_pmd, pmd_t *new_pmd) 197 { 198 spinlock_t *old_ptl, *new_ptl; 199 struct mm_struct *mm = vma->vm_mm; 200 pmd_t pmd; 201 202 if ((old_addr & ~PMD_MASK) || (new_addr & ~PMD_MASK) 203 || old_end - old_addr < PMD_SIZE) 204 return false; 205 206 /* 207 * The destination pmd shouldn't be established, free_pgtables() 208 * should have release it. 209 */ 210 if (WARN_ON(!pmd_none(*new_pmd))) 211 return false; 212 213 /* 214 * We don't have to worry about the ordering of src and dst 215 * ptlocks because exclusive mmap_sem prevents deadlock. 216 */ 217 old_ptl = pmd_lock(vma->vm_mm, old_pmd); 218 new_ptl = pmd_lockptr(mm, new_pmd); 219 if (new_ptl != old_ptl) 220 spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); 221 222 /* Clear the pmd */ 223 pmd = *old_pmd; 224 pmd_clear(old_pmd); 225 226 VM_BUG_ON(!pmd_none(*new_pmd)); 227 228 /* Set the new pmd */ > 229 set_pmd_at(mm, new_addr, new_pmd, pmd); 230 flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE); 231 if (new_ptl != old_ptl) 232 spin_unlock(new_ptl); 233 spin_unlock(old_ptl); 234 235 return true; 236 } 237 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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