Hi Minchan, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16 next-20180410] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Minchan-Kim/mm-workingset-fix-NULL-ptr-dereference/20180410-163500 config: i386-randconfig-a0-201814 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): lib/radix-tree.c: In function 'radix_tree_preload': >> lib/radix-tree.c:522:16: error: 'GFP_ZERO' undeclared (first use in this function) gfp_mask &= ~GFP_ZERO ^ lib/radix-tree.c:522:16: note: each undeclared identifier is reported only once for each function it appears in lib/radix-tree.c:524:2: error: expected ';' before 'return' return __radix_tree_preload(gfp_mask, RADIX_TREE_PRELOAD_SIZE); ^ lib/radix-tree.c:525:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ vim +/GFP_ZERO +522 lib/radix-tree.c 500 501 /* 502 * Load up this CPU's radix_tree_node buffer with sufficient objects to 503 * ensure that the addition of a single element in the tree cannot fail. On 504 * success, return zero, with preemption disabled. On error, return -ENOMEM 505 * with preemption not disabled. 506 * 507 * To make use of this facility, the radix tree must be initialised without 508 * __GFP_DIRECT_RECLAIM being passed to INIT_RADIX_TREE(). 509 */ 510 int radix_tree_preload(gfp_t gfp_mask) 511 { 512 /* Warn on non-sensical use... */ 513 WARN_ON_ONCE(!gfpflags_allow_blocking(gfp_mask)); 514 /* 515 * New allocate node must have node->private_list as INIT_LIST_HEAD 516 * state by workingset shadow memory implementation. 517 * If user pass __GFP_ZERO by mistake, slab allocator will clear 518 * node->private_list, which makes a BUG. Rather than going Oops, 519 * just fix and warn about it. 520 */ 521 if (WARN_ON(gfp_mask & __GFP_ZERO)) > 522 gfp_mask &= ~GFP_ZERO 523 524 return __radix_tree_preload(gfp_mask, RADIX_TREE_PRELOAD_SIZE); 525 } 526 EXPORT_SYMBOL(radix_tree_preload); 527 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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