tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f8c97bdb49832d2b0edaa0c05db873aa2f6101ff commit: ceab27c72f70ce7759f0f1415b83ee6d37f54a42 [9018/9031] mm/migrate: migrate_vma() unmap page from vma while collecting pages config: m32r-allyesconfig (attached as .config) compiler: m32r-linux-gcc (GCC) 6.2.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout ceab27c72f70ce7759f0f1415b83ee6d37f54a42 # save the attached .config to linux build tree make.cross ARCH=m32r All warnings (new ones prefixed by >>): mm/migrate.c: In function 'migrate_vma_collect_hole': mm/migrate.c:2104:22: warning: unused variable 'next' [-Wunused-variable] unsigned long addr, next; ^~~~ In file included from arch/m32r/include/asm/m32r.h:146:0, from arch/m32r/include/asm/ptrace.h:15, from arch/m32r/include/asm/processor.h:18, from arch/m32r/include/asm/thread_info.h:14, from include/linux/thread_info.h:37, from include/asm-generic/preempt.h:4, from ./arch/m32r/include/generated/asm/preempt.h:1, from include/linux/preempt.h:80, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/mm.h:9, from include/linux/migrate.h:4, from mm/migrate.c:15: mm/migrate.c: In function 'migrate_vma_collect_pmd': arch/m32r/include/asm/page.h:39:18: warning: value computed is not used [-Wunused-value] #define __pte(x) ((pte_t) { (x) } ) ^ >> arch/m32r/include/asm/pgtable-2level.h:66:40: note: in expansion of macro '__pte' #define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0)) ^~~~~ >> mm/migrate.c:2177:4: note: in expansion of macro 'ptep_get_and_clear' ptep_get_and_clear(mm, addr, ptep); ^~~~~~~~~~~~~~~~~~ vim +/ptep_get_and_clear +2177 mm/migrate.c 2161 * can't be dropped from it). 2162 */ 2163 get_page(page); 2164 migrate->cpages++; 2165 mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE; 2166 mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0; 2167 2168 /* 2169 * Optimize for the common case where page is only mapped once 2170 * in one process. If we can lock the page, then we can safely 2171 * set up a special migration page table entry now. 2172 */ 2173 if (trylock_page(page)) { 2174 pte_t swp_pte; 2175 2176 mpfn |= MIGRATE_PFN_LOCKED; > 2177 ptep_get_and_clear(mm, addr, ptep); 2178 2179 /* Setup special migration page table entry */ 2180 entry = make_migration_entry(page, pte_write(pte)); 2181 swp_pte = swp_entry_to_pte(entry); 2182 if (pte_soft_dirty(pte)) 2183 swp_pte = pte_swp_mksoft_dirty(swp_pte); 2184 set_pte_at(mm, addr, ptep, swp_pte); 2185 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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