[tip:x86/mm 3/8] mm/memory.c:339:2: error: implicit declaration of function 'tlb_flush_remove_tables_local'; did you mean 'tlb_remove_table'?

From: kbuild test robot
Date: Thu Jul 19 2018 - 03:35:43 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/mm
head: e9d8c61557687b7126101e9550bdf243223f0d8f
commit: 2ff6ddf19c0ec40633bd14d8fe28a289816bd98d [3/8] x86/mm/tlb: Leave lazy TLB mode at page table free time
config: arm-axm55xx_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 2ff6ddf19c0ec40633bd14d8fe28a289816bd98d
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=arm

All errors (new ones prefixed by >>):

mm/memory.c: In function 'tlb_remove_table_smp_sync':
>> mm/memory.c:339:2: error: implicit declaration of function 'tlb_flush_remove_tables_local'; did you mean 'tlb_remove_table'? [-Werror=implicit-function-declaration]
tlb_flush_remove_tables_local(mm);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tlb_remove_table
mm/memory.c: In function 'tlb_table_flush':
>> mm/memory.c:372:2: error: implicit declaration of function 'tlb_flush_remove_tables'; did you mean 'tlb_remove_table'? [-Werror=implicit-function-declaration]
tlb_flush_remove_tables(tlb->mm);
^~~~~~~~~~~~~~~~~~~~~~~
tlb_remove_table
cc1: some warnings being treated as errors

vim +339 mm/memory.c

328
329 static void tlb_remove_table_smp_sync(void *arg)
330 {
331 struct mm_struct __maybe_unused *mm = arg;
332 /*
333 * On most architectures this does nothing. Simply delivering the
334 * interrupt is enough to prevent races with software page table
335 * walking like that done in get_user_pages_fast.
336 *
337 * See the comment near struct mmu_table_batch.
338 */
> 339 tlb_flush_remove_tables_local(mm);
340 }
341
342 static void tlb_remove_table_one(void *table, struct mmu_gather *tlb)
343 {
344 /*
345 * This isn't an RCU grace period and hence the page-tables cannot be
346 * assumed to be actually RCU-freed.
347 *
348 * It is however sufficient for software page-table walkers that rely on
349 * IRQ disabling. See the comment near struct mmu_table_batch.
350 */
351 smp_call_function(tlb_remove_table_smp_sync, tlb->mm, 1);
352 __tlb_remove_table(table);
353 }
354
355 static void tlb_remove_table_rcu(struct rcu_head *head)
356 {
357 struct mmu_table_batch *batch;
358 int i;
359
360 batch = container_of(head, struct mmu_table_batch, rcu);
361
362 for (i = 0; i < batch->nr; i++)
363 __tlb_remove_table(batch->tables[i]);
364
365 free_page((unsigned long)batch);
366 }
367
368 void tlb_table_flush(struct mmu_gather *tlb)
369 {
370 struct mmu_table_batch **batch = &tlb->batch;
371
> 372 tlb_flush_remove_tables(tlb->mm);
373
374 if (*batch) {
375 call_rcu_sched(&(*batch)->rcu, tlb_remove_table_rcu);
376 *batch = NULL;
377 }
378 }
379

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