tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f8c97bdb49832d2b0edaa0c05db873aa2f6101ff commit: 0b0a6994b02cac83ae132baea829ff073ca6cbef [9014/9031] mm/unaddressable-memory: new type of ZONE_DEVICE for unaddressable memory config: x86_64-randconfig-b0-04110636 (attached as .config) compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7 reproduce: git checkout 0b0a6994b02cac83ae132baea829ff073ca6cbef # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): mm/madvise.c: In function 'madvise_free_pte_range': >> mm/madvise.c:341: warning: value computed is not used vim +341 mm/madvise.c 854e9ed0 Minchan Kim 2016-01-15 325 ptent = *pte; 854e9ed0 Minchan Kim 2016-01-15 326 64b42bc1 Minchan Kim 2016-01-15 327 if (pte_none(ptent)) 854e9ed0 Minchan Kim 2016-01-15 328 continue; 64b42bc1 Minchan Kim 2016-01-15 329 /* 64b42bc1 Minchan Kim 2016-01-15 330 * If the pte has swp_entry, just clear page table to 64b42bc1 Minchan Kim 2016-01-15 331 * prevent swap-in which is more expensive rather than 64b42bc1 Minchan Kim 2016-01-15 332 * (page allocation + zeroing). 64b42bc1 Minchan Kim 2016-01-15 333 */ 64b42bc1 Minchan Kim 2016-01-15 334 if (!pte_present(ptent)) { 64b42bc1 Minchan Kim 2016-01-15 335 swp_entry_t entry; 64b42bc1 Minchan Kim 2016-01-15 336 64b42bc1 Minchan Kim 2016-01-15 337 entry = pte_to_swp_entry(ptent); 64b42bc1 Minchan Kim 2016-01-15 338 if (non_swap_entry(entry)) 64b42bc1 Minchan Kim 2016-01-15 339 continue; 64b42bc1 Minchan Kim 2016-01-15 340 nr_swap--; 64b42bc1 Minchan Kim 2016-01-15 @341 free_swap_and_cache(entry); 64b42bc1 Minchan Kim 2016-01-15 342 pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); 64b42bc1 Minchan Kim 2016-01-15 343 continue; 64b42bc1 Minchan Kim 2016-01-15 344 } 854e9ed0 Minchan Kim 2016-01-15 345 854e9ed0 Minchan Kim 2016-01-15 346 page = vm_normal_page(vma, addr, ptent); 854e9ed0 Minchan Kim 2016-01-15 347 if (!page) 854e9ed0 Minchan Kim 2016-01-15 348 continue; 854e9ed0 Minchan Kim 2016-01-15 349 :::::: The code at line 341 was first introduced by commit :::::: 64b42bc1cfdf6e2c3ab7315f2ff56c31cd257370 mm/madvise.c: free swp_entry in madvise_free :::::: TO: Minchan Kim <minchan@xxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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