[linux-rt-devel:linux-5.4.y-rt-rebase 113/253] mm/swap.c:348:9: sparse: sparse: context imbalance in 'rotate_reclaimable_page' - different lock contexts for basic block
10:26 a.m.
Hi Thomas,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
linux-5.4.y-rt-rebase
head: 5897a52fd4fdb49ac156ecf09507d0b5a27eb05c
commit: 124a2170d0d899fe104f02e462bc7c70c9cb4492 [113/253] preempt: Provide
preempt_*_(no)rt variants
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-153-g47b6dfef-dirty
git checkout 124a2170d0d899fe104f02e462bc7c70c9cb4492
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(a)intel.com>
sparse warnings: (new ones prefixed by >>)
include/linux/spinlock.h:393:9: sparse: sparse: context imbalance in
'pagevec_lru_move_fn' - unexpected unlock
> mm/swap.c:348:9: sparse: sparse: context imbalance in
'rotate_reclaimable_page' - different lock contexts for basic block
> mm/swap.c:440:13: sparse: sparse: context imbalance in
'__lru_cache_activate_page' - different lock contexts for basic block
> mm/swap.c:505:13: sparse: sparse: context imbalance in '__lru_cache_add' -
different lock contexts for basic block
> mm/swap.c:695:6: sparse: sparse: context imbalance in 'lru_add_drain_cpu' -
different lock contexts for basic block
> mm/swap.c:743:6: sparse: sparse: context imbalance in 'deactivate_file_page'
- different lock contexts for basic block
> mm/swap.c:775:9: sparse: sparse: context imbalance in 'deactivate_page' -
different lock contexts for basic block
> mm/swap.c:801:9: sparse: sparse: context imbalance in 'mark_page_lazyfree' -
different lock contexts for basic block
vim +/rotate_reclaimable_page +348 mm/swap.c
902aaed0d983df Hisashi Hifumi 2007-10-16 340
^1da177e4c3f41 Linus Torvalds 2005-04-16 341 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 342 * Writeback is about to end against a
page which has been marked for immediate
^1da177e4c3f41 Linus Torvalds 2005-04-16 343 * reclaim. If it still appears to be
reclaimable, move it to the tail of the
902aaed0d983df Hisashi Hifumi 2007-10-16 344 * inactive list.
^1da177e4c3f41 Linus Torvalds 2005-04-16 345 */
ac6aadb24b7d4f Miklos Szeredi 2008-04-28 346 void rotate_reclaimable_page(struct
page *page)
^1da177e4c3f41 Linus Torvalds 2005-04-16 347 {
c55e8d035b28b2 Johannes Weiner 2017-02-24 @348 if (!PageLocked(page) &&
!PageDirty(page) &&
894bc310419ac9 Lee Schermerhorn 2008-10-18 349 !PageUnevictable(page) &&
PageLRU(page)) {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 350 struct swap_pagevec *swpvec;
902aaed0d983df Hisashi Hifumi 2007-10-16 351 struct pagevec *pvec;
^1da177e4c3f41 Linus Torvalds 2005-04-16 352 unsigned long flags;
^1da177e4c3f41 Linus Torvalds 2005-04-16 353
09cbfeaf1a5a67 Kirill A. Shutemov 2016-04-01 354 get_page(page);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 355
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 356 swpvec =
lock_swap_pvec_irqsave(&lru_rotate_pvecs, &flags);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 357 pvec = &swpvec->pvec;
8f182270dfec43 Lukasz Odzioba 2016-06-24 358 if (!pagevec_add(pvec, page) ||
PageCompound(page))
902aaed0d983df Hisashi Hifumi 2007-10-16 359 pagevec_move_tail(pvec);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 360 unlock_swap_pvec_irqrestore(swpvec,
flags);
ac6aadb24b7d4f Miklos Szeredi 2008-04-28 361 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 362 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 363
fa9add641b1b1c Hugh Dickins 2012-05-29 364 static void
update_page_reclaim_stat(struct lruvec *lruvec,
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 365 int file, int rotated)
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 366 {
fa9add641b1b1c Hugh Dickins 2012-05-29 367 struct zone_reclaim_stat *reclaim_stat
= &lruvec->reclaim_stat;
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 368
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 369
reclaim_stat->recent_scanned[file]++;
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 370 if (rotated)
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 371
reclaim_stat->recent_rotated[file]++;
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 372 }
3e2f41f1f64744 KOSAKI Motohiro 2009-01-07 373
fa9add641b1b1c Hugh Dickins 2012-05-29 374 static void __activate_page(struct page
*page, struct lruvec *lruvec,
fa9add641b1b1c Hugh Dickins 2012-05-29 375 void *arg)
^1da177e4c3f41 Linus Torvalds 2005-04-16 376 {
7a608572a282a7 Linus Torvalds 2011-01-17 377 if (PageLRU(page) &&
!PageActive(page) && !PageUnevictable(page)) {
4f98a2fee8acdb Rik van Riel 2008-10-18 378 int file = page_is_file_cache(page);
401a8e1c167008 Johannes Weiner 2009-09-21 379 int lru = page_lru_base_type(page);
4f98a2fee8acdb Rik van Riel 2008-10-18 380
fa9add641b1b1c Hugh Dickins 2012-05-29 381 del_page_from_lru_list(page, lruvec,
lru);
^1da177e4c3f41 Linus Torvalds 2005-04-16 382 SetPageActive(page);
4f98a2fee8acdb Rik van Riel 2008-10-18 383 lru += LRU_ACTIVE;
fa9add641b1b1c Hugh Dickins 2012-05-29 384 add_page_to_lru_list(page, lruvec,
lru);
24b7e5819ad5cb Mel Gorman 2014-08-06 385 trace_mm_lru_activate(page);
744ed144275776 Shaohua Li 2011-01-13 386
fa9add641b1b1c Hugh Dickins 2012-05-29 387 __count_vm_event(PGACTIVATE);
fa9add641b1b1c Hugh Dickins 2012-05-29 388 update_page_reclaim_stat(lruvec,
file, 1);
744ed144275776 Shaohua Li 2011-01-13 389 }
eb709b0d062efd Shaohua Li 2011-05-24 390 }
eb709b0d062efd Shaohua Li 2011-05-24 391
eb709b0d062efd Shaohua Li 2011-05-24 392 #ifdef CONFIG_SMP
eb709b0d062efd Shaohua Li 2011-05-24 393 static void activate_page_drain(int
cpu)
eb709b0d062efd Shaohua Li 2011-05-24 394 {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 395 struct swap_pagevec *swpvec =
lock_swap_pvec_cpu(&activate_page_pvecs, cpu);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 396 struct pagevec *pvec =
&swpvec->pvec;
eb709b0d062efd Shaohua Li 2011-05-24 397
eb709b0d062efd Shaohua Li 2011-05-24 398 if (pagevec_count(pvec))
eb709b0d062efd Shaohua Li 2011-05-24 399 pagevec_lru_move_fn(pvec,
__activate_page, NULL);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 400 unlock_swap_pvec_cpu(swpvec);
eb709b0d062efd Shaohua Li 2011-05-24 401 }
eb709b0d062efd Shaohua Li 2011-05-24 402
5fbc461636c32e Chris Metcalf 2013-09-12 403 static bool
need_activate_page_drain(int cpu)
5fbc461636c32e Chris Metcalf 2013-09-12 404 {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 405 return
pagevec_count(per_cpu_ptr(&activate_page_pvecs.pvec, cpu)) != 0;
5fbc461636c32e Chris Metcalf 2013-09-12 406 }
5fbc461636c32e Chris Metcalf 2013-09-12 407
eb709b0d062efd Shaohua Li 2011-05-24 408 void activate_page(struct page *page)
eb709b0d062efd Shaohua Li 2011-05-24 409 {
800d8c63b2e989 Kirill A. Shutemov 2016-07-26 410 page = compound_head(page);
eb709b0d062efd Shaohua Li 2011-05-24 411 if (PageLRU(page) &&
!PageActive(page) && !PageUnevictable(page)) {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 412 struct swap_pagevec *swpvec;
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 413 struct pagevec *pvec;
eb709b0d062efd Shaohua Li 2011-05-24 414
09cbfeaf1a5a67 Kirill A. Shutemov 2016-04-01 415 get_page(page);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 416 swpvec =
lock_swap_pvec(&activate_page_pvecs);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 417 pvec = &swpvec->pvec;
8f182270dfec43 Lukasz Odzioba 2016-06-24 418 if (!pagevec_add(pvec, page) ||
PageCompound(page))
eb709b0d062efd Shaohua Li 2011-05-24 419 pagevec_lru_move_fn(pvec,
__activate_page, NULL);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 420 unlock_swap_pvec(swpvec,
&activate_page_pvecs);
eb709b0d062efd Shaohua Li 2011-05-24 421 }
eb709b0d062efd Shaohua Li 2011-05-24 422 }
eb709b0d062efd Shaohua Li 2011-05-24 423
eb709b0d062efd Shaohua Li 2011-05-24 424 #else
eb709b0d062efd Shaohua Li 2011-05-24 425 static inline void
activate_page_drain(int cpu)
eb709b0d062efd Shaohua Li 2011-05-24 426 {
eb709b0d062efd Shaohua Li 2011-05-24 427 }
eb709b0d062efd Shaohua Li 2011-05-24 428
eb709b0d062efd Shaohua Li 2011-05-24 429 void activate_page(struct page *page)
eb709b0d062efd Shaohua Li 2011-05-24 430 {
f4b7e272b5c042 Andrey Ryabinin 2019-03-05 431 pg_data_t *pgdat = page_pgdat(page);
eb709b0d062efd Shaohua Li 2011-05-24 432
800d8c63b2e989 Kirill A. Shutemov 2016-07-26 433 page = compound_head(page);
f4b7e272b5c042 Andrey Ryabinin 2019-03-05 434
spin_lock_irq(&pgdat->lru_lock);
f4b7e272b5c042 Andrey Ryabinin 2019-03-05 435 __activate_page(page,
mem_cgroup_page_lruvec(page, pgdat), NULL);
f4b7e272b5c042 Andrey Ryabinin 2019-03-05 436
spin_unlock_irq(&pgdat->lru_lock);
^1da177e4c3f41 Linus Torvalds 2005-04-16 437 }
eb709b0d062efd Shaohua Li 2011-05-24 438 #endif
^1da177e4c3f41 Linus Torvalds 2005-04-16 439
059285a25f30c1 Mel Gorman 2013-07-03 @440 static void
__lru_cache_activate_page(struct page *page)
059285a25f30c1 Mel Gorman 2013-07-03 441 {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 442 struct swap_pagevec *swpvec =
lock_swap_pvec(&lru_add_pvec);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 443 struct pagevec *pvec =
&swpvec->pvec;
059285a25f30c1 Mel Gorman 2013-07-03 444 int i;
059285a25f30c1 Mel Gorman 2013-07-03 445
059285a25f30c1 Mel Gorman 2013-07-03 446 /*
059285a25f30c1 Mel Gorman 2013-07-03 447 * Search backwards on the optimistic
assumption that the page being
059285a25f30c1 Mel Gorman 2013-07-03 448 * activated has just been added to
this pagevec. Note that only
059285a25f30c1 Mel Gorman 2013-07-03 449 * the local pagevec is examined as a
!PageLRU page could be in the
059285a25f30c1 Mel Gorman 2013-07-03 450 * process of being released,
reclaimed, migrated or on a remote
059285a25f30c1 Mel Gorman 2013-07-03 451 * pagevec that is currently being
drained. Furthermore, marking
059285a25f30c1 Mel Gorman 2013-07-03 452 * a remote pagevec's page
PageActive potentially hits a race where
059285a25f30c1 Mel Gorman 2013-07-03 453 * a page is marked PageActive just
after it is added to the inactive
059285a25f30c1 Mel Gorman 2013-07-03 454 * list causing accounting errors and
BUG_ON checks to trigger.
059285a25f30c1 Mel Gorman 2013-07-03 455 */
059285a25f30c1 Mel Gorman 2013-07-03 456 for (i = pagevec_count(pvec) - 1; i
>= 0; i--) {
059285a25f30c1 Mel Gorman 2013-07-03 457 struct page *pagevec_page =
pvec->pages[i];
059285a25f30c1 Mel Gorman 2013-07-03 458
059285a25f30c1 Mel Gorman 2013-07-03 459 if (pagevec_page == page) {
059285a25f30c1 Mel Gorman 2013-07-03 460 SetPageActive(page);
059285a25f30c1 Mel Gorman 2013-07-03 461 break;
059285a25f30c1 Mel Gorman 2013-07-03 462 }
059285a25f30c1 Mel Gorman 2013-07-03 463 }
059285a25f30c1 Mel Gorman 2013-07-03 464
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 465 unlock_swap_pvec(swpvec,
&lru_add_pvec);
059285a25f30c1 Mel Gorman 2013-07-03 466 }
059285a25f30c1 Mel Gorman 2013-07-03 467
^1da177e4c3f41 Linus Torvalds 2005-04-16 468 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 469 * Mark a page as having seen
activity.
^1da177e4c3f41 Linus Torvalds 2005-04-16 470 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 471 *
inactive,unreferenced -> inactive,referenced
^1da177e4c3f41 Linus Torvalds 2005-04-16 472 *
inactive,referenced -> active,unreferenced
^1da177e4c3f41 Linus Torvalds 2005-04-16 473 *
active,unreferenced -> active,referenced
eb39d618f9e80f Hugh Dickins 2014-08-06 474 *
eb39d618f9e80f Hugh Dickins 2014-08-06 475 * When a newly allocated page is not
yet visible, so safe for non-atomic ops,
eb39d618f9e80f Hugh Dickins 2014-08-06 476 * __SetPageReferenced(page) may be
substituted for mark_page_accessed(page).
^1da177e4c3f41 Linus Torvalds 2005-04-16 477 */
920c7a5d0c94b8 Harvey Harrison 2008-02-04 478 void mark_page_accessed(struct page
*page)
^1da177e4c3f41 Linus Torvalds 2005-04-16 479 {
e90309c9f7722d Kirill A. Shutemov 2016-01-15 480 page = compound_head(page);
894bc310419ac9 Lee Schermerhorn 2008-10-18 481 if (!PageActive(page) &&
!PageUnevictable(page) &&
059285a25f30c1 Mel Gorman 2013-07-03 482 PageReferenced(page)) {
059285a25f30c1 Mel Gorman 2013-07-03 483
059285a25f30c1 Mel Gorman 2013-07-03 484 /*
059285a25f30c1 Mel Gorman 2013-07-03 485 * If the page is on the LRU, queue
it for activation via
059285a25f30c1 Mel Gorman 2013-07-03 486 * activate_page_pvecs. Otherwise,
assume the page is on a
059285a25f30c1 Mel Gorman 2013-07-03 487 * pagevec, mark it active and
it'll be moved to the active
059285a25f30c1 Mel Gorman 2013-07-03 488 * LRU on the next drain.
059285a25f30c1 Mel Gorman 2013-07-03 489 */
059285a25f30c1 Mel Gorman 2013-07-03 490 if (PageLRU(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 491 activate_page(page);
059285a25f30c1 Mel Gorman 2013-07-03 492 else
059285a25f30c1 Mel Gorman 2013-07-03 493 __lru_cache_activate_page(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 494 ClearPageReferenced(page);
a528910e12ec7e Johannes Weiner 2014-04-03 495 if (page_is_file_cache(page))
a528910e12ec7e Johannes Weiner 2014-04-03 496 workingset_activation(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 497 } else if (!PageReferenced(page)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 498 SetPageReferenced(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 499 }
33c3fc71c8cfa3 Vladimir Davydov 2015-09-09 500 if (page_is_idle(page))
33c3fc71c8cfa3 Vladimir Davydov 2015-09-09 501 clear_page_idle(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 502 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 503 EXPORT_SYMBOL(mark_page_accessed);
^1da177e4c3f41 Linus Torvalds 2005-04-16 504
2329d3751b082b Jianyu Zhan 2014-06-04 @505 static void __lru_cache_add(struct page
*page)
^1da177e4c3f41 Linus Torvalds 2005-04-16 506 {
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 507 struct swap_pagevec *swpvec =
lock_swap_pvec(&lru_add_pvec);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 508 struct pagevec *pvec =
&swpvec->pvec;
13f7f78981e49f Mel Gorman 2013-07-03 509
09cbfeaf1a5a67 Kirill A. Shutemov 2016-04-01 510 get_page(page);
8f182270dfec43 Lukasz Odzioba 2016-06-24 511 if (!pagevec_add(pvec, page) ||
PageCompound(page))
a0b8cab3b9b2ef Mel Gorman 2013-07-03 512 __pagevec_lru_add(pvec);
6ecb3de7d7b700 Thomas Gleixner 2019-04-18 513 unlock_swap_pvec(swpvec,
&lru_add_pvec);
^1da177e4c3f41 Linus Torvalds 2005-04-16 514 }
2329d3751b082b Jianyu Zhan 2014-06-04 515
:::::: The code at line 348 was first introduced by commit
:::::: c55e8d035b28b2867e68b0e2d0eee2c0f1016b43 mm: vmscan: move dirty pages out of the
way until they're flushed
:::::: TO: Johannes Weiner <hannes(a)cmpxchg.org>
:::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation
11:29 a.m.
On 2020-01-28 18:26:57 [+0800], kbuild test robot wrote:
…
sparse warnings: (new ones prefixed by >>)
include/linux/spinlock.h:393:9: sparse: sparse: context imbalance in
'pagevec_lru_move_fn' - unexpected unlock
This looks okay and is the same as upstream. The unlock only happens if
`pgdat' if set and this happens only in the for-loop.
>> mm/swap.c:348:9: sparse: sparse: context imbalance in
'rotate_reclaimable_page' - different lock contexts for basic block
>> mm/swap.c:440:13: sparse: sparse: context imbalance in
'__lru_cache_activate_page' - different lock contexts for basic block
>> mm/swap.c:505:13: sparse: sparse: context imbalance in '__lru_cache_add'
- different lock contexts for basic block
>> mm/swap.c:695:6: sparse: sparse: context imbalance in
'lru_add_drain_cpu' - different lock contexts for basic block
>> mm/swap.c:743:6: sparse: sparse: context imbalance in
'deactivate_file_page' - different lock contexts for basic block
>> mm/swap.c:775:9: sparse: sparse: context imbalance in 'deactivate_page'
- different lock contexts for basic block
>> mm/swap.c:801:9: sparse: sparse: context imbalance in
'mark_page_lazyfree' - different lock contexts for basic block
those look okay, took. The lock part deferences a per-CPU variable and
the local pointer is returned. The unlock part uses the local pointer.
This and the `if' (locked vs preempt-disable mode) might confuse sparse.
Sebastian
390
days inactive
397
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kbuild test robot -
Sebastian Andrzej Siewior