tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 3c09c1950c8483eeeb4bf9615ecdcec7234c6790 commit: 1203396fa708fde7b2bfb892b9f2ce62da485473 [3880/3985] mm/vmalloc.c: preload a CPU with one object for split purpose reproduce: # apt-get install sparse # sparse version: v0.6.1-rc1-7-g2b96cd8-dirty git checkout 1203396fa708fde7b2bfb892b9f2ce62da485473 make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> mm/vmalloc.c:1076:21: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct vmap_area *[noderef] <asn:3> *__p @@ got [noderef] <asn:3> *__p @@ >> mm/vmalloc.c:1076:21: sparse: expected struct vmap_area *[noderef] <asn:3> *__p >> mm/vmalloc.c:1076:21: sparse: got struct vmap_area ** mm/vmalloc.c:961:23: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct vmap_area *[noderef] <asn:3> *__p @@ got [noderef] <asn:3> *__p @@ mm/vmalloc.c:961:23: sparse: expected struct vmap_area *[noderef] <asn:3> *__p mm/vmalloc.c:961:23: sparse: got struct vmap_area ** >> mm/vmalloc.c:1076:21: sparse: sparse: dereference of noderef expression >> mm/vmalloc.c:1076:21: sparse: sparse: dereference of noderef expression mm/vmalloc.c:961:23: sparse: sparse: dereference of noderef expression mm/vmalloc.c:961:23: sparse: sparse: dereference of noderef expression vim +1076 mm/vmalloc.c 1047 1048 /* 1049 * Preload this CPU with one extra vmap_area object to ensure 1050 * that we have it available when fit type of free area is 1051 * NE_FIT_TYPE. 1052 * 1053 * The preload is done in non-atomic context, thus it allows us 1054 * to use more permissive allocation masks to be more stable under 1055 * low memory condition and high memory pressure. 1056 * 1057 * If success it returns 1 with preemption disabled. In case 1058 * of error 0 is returned with preemption not disabled. Note it 1059 * has to be paired with ne_fit_preload_end(). 1060 */ 1061 static int 1062 ne_fit_preload(int nid) 1063 { 1064 preempt_disable(); 1065 1066 if (!__this_cpu_read(ne_fit_preload_node)) { 1067 struct vmap_area *node; 1068 1069 preempt_enable(); 1070 node = kmem_cache_alloc_node(vmap_area_cachep, GFP_KERNEL, nid); 1071 if (node == NULL) 1072 return 0; 1073 1074 preempt_disable(); 1075 > 1076 if (__this_cpu_cmpxchg(ne_fit_preload_node, NULL, node)) 1077 kmem_cache_free(vmap_area_cachep, node); 1078 } 1079 1080 return 1; 1081 } 1082 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
