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SubjectRe: [PATCH 05/10] percpu: change reserved_size to end page aligned
Hi Dennis,

[auto build test ERROR on percpu/for-next]
[also build test ERROR on v4.13-rc1 next-20170714]
[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/Dennis-Zhou/percpu-replace-percpu-area-map-allocator-with-bitmap-allocator/20170716-103337
base: https://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-next
config: ia64-allmodconfig (attached as .config)
compiler: ia64-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
# save the attached .config to linux build tree
make.cross ARCH=ia64

All errors (new ones prefixed by >>):

arch/ia64/mm/discontig.c: In function 'setup_per_cpu_areas':
>> arch/ia64/mm/discontig.c:218:10: error: 'PERCPU_MODULE_RSERVE' undeclared (first use in this function)
PERCPU_MODULE_RSERVE);
^~~~~~~~~~~~~~~~~~~~
arch/ia64/mm/discontig.c:218:10: note: each undeclared identifier is reported only once for each function it appears in

vim +/PERCPU_MODULE_RSERVE +218 arch/ia64/mm/discontig.c

174
175 #ifdef CONFIG_SMP
176 /**
177 * setup_per_cpu_areas - setup percpu areas
178 *
179 * Arch code has already allocated and initialized percpu areas. All
180 * this function has to do is to teach the determined layout to the
181 * dynamic percpu allocator, which happens to be more complex than
182 * creating whole new ones using helpers.
183 */
184 void __init setup_per_cpu_areas(void)
185 {
186 struct pcpu_alloc_info *ai;
187 struct pcpu_group_info *uninitialized_var(gi);
188 unsigned int *cpu_map;
189 void *base;
190 unsigned long base_offset;
191 unsigned int cpu;
192 ssize_t static_size, reserved_size, dyn_size;
193 int node, prev_node, unit, nr_units, rc;
194
195 ai = pcpu_alloc_alloc_info(MAX_NUMNODES, nr_cpu_ids);
196 if (!ai)
197 panic("failed to allocate pcpu_alloc_info");
198 cpu_map = ai->groups[0].cpu_map;
199
200 /* determine base */
201 base = (void *)ULONG_MAX;
202 for_each_possible_cpu(cpu)
203 base = min(base,
204 (void *)(__per_cpu_offset[cpu] + __per_cpu_start));
205 base_offset = (void *)__per_cpu_start - base;
206
207 /* build cpu_map, units are grouped by node */
208 unit = 0;
209 for_each_node(node)
210 for_each_possible_cpu(cpu)
211 if (node == node_cpuid[cpu].nid)
212 cpu_map[unit++] = cpu;
213 nr_units = unit;
214
215 /* set basic parameters */
216 static_size = __per_cpu_end - __per_cpu_start;
217 reserved_size = pcpu_align_reserved_region(static_size,
> 218 PERCPU_MODULE_RSERVE);
219 dyn_size = PERCPU_PAGE_SIZE - static_size - reserved_size;
220 if (dyn_size < 0)
221 panic("percpu area overflow static=%zd reserved=%zd\n",
222 static_size, reserved_size);
223
224 ai->static_size = static_size;
225 ai->reserved_size = reserved_size;
226 ai->dyn_size = dyn_size;
227 ai->unit_size = PERCPU_PAGE_SIZE;
228 ai->atom_size = PAGE_SIZE;
229 ai->alloc_size = PERCPU_PAGE_SIZE;
230
231 /*
232 * CPUs are put into groups according to node. Walk cpu_map
233 * and create new groups at node boundaries.
234 */
235 prev_node = -1;
236 ai->nr_groups = 0;
237 for (unit = 0; unit < nr_units; unit++) {
238 cpu = cpu_map[unit];
239 node = node_cpuid[cpu].nid;
240
241 if (node == prev_node) {
242 gi->nr_units++;
243 continue;
244 }
245 prev_node = node;
246
247 gi = &ai->groups[ai->nr_groups++];
248 gi->nr_units = 1;
249 gi->base_offset = __per_cpu_offset[cpu] + base_offset;
250 gi->cpu_map = &cpu_map[unit];
251 }
252
253 rc = pcpu_setup_first_chunk(ai, base);
254 if (rc)
255 panic("failed to setup percpu area (err=%d)", rc);
256
257 pcpu_free_alloc_info(ai);
258 }
259 #endif
260

---
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