Re: [PATCH 2/6] x86,tlb: leave lazy TLB mode at page table free time
From: kbuild test robot
Date: Wed Jun 27 2018 - 02:04:14 EST
Hi Rik,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc2 next-20180626]
[cannot apply to tip/x86/core]
[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/Rik-van-Riel/mm-allocate-mm_cpumask-dynamically-based-on-nr_cpu_ids/20180627-021116
config: arm-keystone_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
# 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 *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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