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Message-ID: <202411031829.7KQDfJy1-lkp@intel.com>
Date: Sun, 3 Nov 2024 18:57:28 +0800
From: kernel test robot <lkp@...el.com>
To: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
hannes@...xchg.org, yosryahmed@...gle.com, nphamcs@...il.com,
chengming.zhou@...ux.dev, usamaarif642@...il.com,
ryan.roberts@....com, ying.huang@...el.com, 21cnbao@...il.com,
akpm@...ux-foundation.org, linux-crypto@...r.kernel.org,
herbert@...dor.apana.org.au, davem@...emloft.net,
clabbe@...libre.com, ardb@...nel.org, ebiggers@...gle.com,
surenb@...gle.com, kristen.c.accardi@...el.com, zanussi@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
wajdi.k.feghali@...el.com, vinodh.gopal@...el.com,
kanchana.p.sridhar@...el.com
Subject: Re: [PATCH v2 08/13] mm: zswap: acomp_ctx mutex lock/unlock
optimizations.
Hi Kanchana,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 5c4cf96cd70230100b5d396d45a5c9a332539d19]
url: https://github.com/intel-lab-lkp/linux/commits/Kanchana-P-Sridhar/crypto-acomp-Define-two-new-interfaces-for-compress-decompress-batching/20241103-112337
base: 5c4cf96cd70230100b5d396d45a5c9a332539d19
patch link: https://lore.kernel.org/r/20241103032111.333282-9-kanchana.p.sridhar%40intel.com
patch subject: [PATCH v2 08/13] mm: zswap: acomp_ctx mutex lock/unlock optimizations.
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20241103/202411031829.7KQDfJy1-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 639a7ac648f1e50ccd2556e17d401c04f9cce625)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241103/202411031829.7KQDfJy1-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411031829.7KQDfJy1-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from mm/zswap.c:18:
In file included from include/linux/highmem.h:10:
In file included from include/linux/mm.h:2211:
include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from mm/zswap.c:18:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from mm/zswap.c:18:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from mm/zswap.c:18:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
In file included from mm/zswap.c:40:
In file included from mm/internal.h:13:
include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
47 | __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~ ^ ~~~
include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
49 | NR_ZONE_LRU_BASE + lru, nr_pages);
| ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/zswap.c:1529:7: warning: variable 'acomp_ctx' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
1529 | if (memcg_list_lru_alloc(memcg, &zswap_list_lru, GFP_KERNEL)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mm/zswap.c:1560:16: note: uninitialized use occurs here
1560 | mutex_unlock(&acomp_ctx->mutex);
| ^~~~~~~~~
mm/zswap.c:1529:3: note: remove the 'if' if its condition is always false
1529 | if (memcg_list_lru_alloc(memcg, &zswap_list_lru, GFP_KERNEL)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1530 | mem_cgroup_put(memcg);
| ~~~~~~~~~~~~~~~~~~~~~~
1531 | goto put_pool;
| ~~~~~~~~~~~~~~
1532 | }
| ~
mm/zswap.c:1496:36: note: initialize the variable 'acomp_ctx' to silence this warning
1496 | struct crypto_acomp_ctx *acomp_ctx;
| ^
| = NULL
10 warnings generated.
vim +1529 mm/zswap.c
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1491
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1492 bool zswap_store(struct folio *folio)
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1493 {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1494 long nr_pages = folio_nr_pages(folio);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1495 swp_entry_t swp = folio->swap;
68dac3aa759e32 Kanchana P Sridhar 2024-11-02 1496 struct crypto_acomp_ctx *acomp_ctx;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1497 struct obj_cgroup *objcg = NULL;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1498 struct mem_cgroup *memcg = NULL;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1499 struct zswap_pool *pool;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1500 size_t compressed_bytes = 0;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1501 bool ret = false;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1502 long index;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1503
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1504 VM_WARN_ON_ONCE(!folio_test_locked(folio));
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1505 VM_WARN_ON_ONCE(!folio_test_swapcache(folio));
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1506
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1507 if (!zswap_enabled)
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1508 goto check_old;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1509
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1510 objcg = get_obj_cgroup_from_folio(folio);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1511 if (objcg && !obj_cgroup_may_zswap(objcg)) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1512 memcg = get_mem_cgroup_from_objcg(objcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1513 if (shrink_memcg(memcg)) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1514 mem_cgroup_put(memcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1515 goto put_objcg;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1516 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1517 mem_cgroup_put(memcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1518 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1519
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1520 if (zswap_check_limits())
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1521 goto put_objcg;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1522
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1523 pool = zswap_pool_current_get();
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1524 if (!pool)
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1525 goto put_objcg;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1526
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1527 if (objcg) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1528 memcg = get_mem_cgroup_from_objcg(objcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 @1529 if (memcg_list_lru_alloc(memcg, &zswap_list_lru, GFP_KERNEL)) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1530 mem_cgroup_put(memcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1531 goto put_pool;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1532 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1533 mem_cgroup_put(memcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1534 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1535
68dac3aa759e32 Kanchana P Sridhar 2024-11-02 1536 acomp_ctx = raw_cpu_ptr(pool->acomp_ctx);
68dac3aa759e32 Kanchana P Sridhar 2024-11-02 1537 mutex_lock(&acomp_ctx->mutex);
68dac3aa759e32 Kanchana P Sridhar 2024-11-02 1538
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1539 for (index = 0; index < nr_pages; ++index) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1540 struct page *page = folio_page(folio, index);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1541 ssize_t bytes;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1542
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1543 bytes = zswap_store_page(page, objcg, pool);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1544 if (bytes < 0)
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1545 goto put_pool;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1546 compressed_bytes += bytes;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1547 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1548
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1549 if (objcg) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1550 obj_cgroup_charge_zswap(objcg, compressed_bytes);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1551 count_objcg_events(objcg, ZSWPOUT, nr_pages);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1552 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1553
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1554 atomic_long_add(nr_pages, &zswap_stored_pages);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1555 count_vm_events(ZSWPOUT, nr_pages);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1556
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1557 ret = true;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1558
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1559 put_pool:
68dac3aa759e32 Kanchana P Sridhar 2024-11-02 1560 mutex_unlock(&acomp_ctx->mutex);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1561 zswap_pool_put(pool);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1562 put_objcg:
f4840ccfca25db Johannes Weiner 2022-05-19 1563 obj_cgroup_put(objcg);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1564 if (!ret && zswap_pool_reached_full)
4ea3fa9dd2e9c5 Yosry Ahmed 2024-04-13 1565 queue_work(shrink_wq, &zswap_shrink_work);
f576a1e80c3a97 Chengming Zhou 2024-02-09 1566 check_old:
f576a1e80c3a97 Chengming Zhou 2024-02-09 1567 /*
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1568 * If the zswap store fails or zswap is disabled, we must invalidate
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1569 * the possibly stale entries which were previously stored at the
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1570 * offsets corresponding to each page of the folio. Otherwise,
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1571 * writeback could overwrite the new data in the swapfile.
f576a1e80c3a97 Chengming Zhou 2024-02-09 1572 */
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1573 if (!ret) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1574 unsigned type = swp_type(swp);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1575 pgoff_t offset = swp_offset(swp);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1576 struct zswap_entry *entry;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1577 struct xarray *tree;
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1578
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1579 for (index = 0; index < nr_pages; ++index) {
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1580 tree = swap_zswap_tree(swp_entry(type, offset + index));
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1581 entry = xa_erase(tree, offset + index);
f576a1e80c3a97 Chengming Zhou 2024-02-09 1582 if (entry)
796c2c23e14e75 Chris Li 2024-03-26 1583 zswap_entry_free(entry);
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1584 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1585 }
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1586
ccacfbe8c6963d Kanchana P Sridhar 2024-09-30 1587 return ret;
2b2811178e8555 Seth Jennings 2013-07-10 1588 }
2b2811178e8555 Seth Jennings 2013-07-10 1589
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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