Mathieu Desnoyers
65af70aa56
mm: add missing release barrier on PGDAT_RECLAIM_LOCKED unlock ...
commit c0ebbb3841e07c4493e6fe351698806b09a87a37 upstream.
The PGDAT_RECLAIM_LOCKED bit is used to provide mutual exclusion of node
reclaim for struct pglist_data using a single bit.
It is "locked" with a test_and_set_bit (similarly to a try lock) which
provides full ordering with respect to loads and stores done within
__node_reclaim().
It is "unlocked" with clear_bit(), which does not provide any ordering
with respect to loads and stores done before clearing the bit.
The lack of clear_bit() memory ordering with respect to stores within
__node_reclaim() can cause a subsequent CPU to fail to observe stores from
a prior node reclaim. This is not an issue in practice on TSO (e.g.
x86), but it is an issue on weakly-ordered architectures (e.g. arm64).
Fix this by using clear_bit_unlock rather than clear_bit to clear
PGDAT_RECLAIM_LOCKED with a release memory ordering semantic.
This provides stronger memory ordering (release rather than relaxed).
Link: https://lkml.kernel.org/r/20250312141014.129725-1-mathieu.desnoyers@efficios.com
Fixes: d773ed6b85
2025-05-02 07:39:16 +02:00
panic: Consolidate open-coded panic_on_warn checks
2023-02-06 07:52:50 +01:00
mm: bdi: initialize bdi_min_ratio when bdi is unregistered
2021-12-14 14:49:00 +01:00
mm/cma: use nth_page() in place of direct struct page manipulation
2023-11-28 16:50:19 +00:00
mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations
2024-04-13 12:51:34 +02:00
mm: allow a controlled amount of unfairness in the page lock
2023-08-30 16:27:26 +02:00
v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails
2022-12-08 11:23:06 +01:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
mm/hugetlb: fix races when looking up a CONT-PTE/PMD size hugetlb page
2022-12-19 12:24:15 +01:00
mm/thp: check and bail out if page in deferred queue already
2023-03-11 16:44:05 +01:00
mm/hugetlb: fix races when looking up a CONT-PTE/PMD size hugetlb page
2022-12-19 12:24:15 +01:00
mm/thp: fix vma_address() if virtual address below file offset
2021-06-30 08:47:52 -04:00
mm/khugepaged: fix collapse_pte_mapped_thp() to allow anon_vma
2023-01-24 07:18:01 +01:00
Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()"
2022-09-15 12:04:49 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
mm: fix madivse_pageout mishandling on non-LRU page
2022-10-05 10:37:43 +02:00
Revert "mm: Always release pages to the buddy allocator in memblock_free_late()."
2023-02-22 12:50:39 +01:00
memcg: fix soft lockup in the OOM process
2025-03-13 12:43:21 +01:00
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-08 19:07:49 +01:00
mm/memory-failure: fix an incorrect use of tail pages
2024-04-13 12:51:31 +02:00
mm: avoid leaving partial pfn mappings around in error case
2024-11-17 14:58:53 +01:00
mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range()
2021-09-22 12:26:43 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
memtest: use {READ,WRITE}_ONCE in memory scanning
2024-04-13 12:51:27 +02:00
mm/migrate: set swap entry values of THP tail pages properly.
2024-04-13 12:51:31 +02:00
mm: Fix TLB flush for not-first PFNMAP mappings in unmap_region()
2022-09-20 12:28:00 +02:00
mm/khugepaged: fix GUP-fast interaction by sending IPI
2022-12-14 11:30:42 +01:00
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
2022-05-15 19:54:46 +02:00
mm/mremap: hold the rmap lock in write mode when moving page table entries.
2022-08-25 11:17:20 +02:00
memcg: fix soft lockup in the OOM process
2025-03-13 12:43:21 +01:00
mm: avoid overflows in dirty throttling logic
2024-08-19 05:33:42 +02:00
mm/page_alloc: fix uninitialized variable
2025-03-13 12:43:28 +01:00
mm: fix unexpected zeroed page mapping with zram swap
2022-05-12 12:23:48 +02:00
mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk()
2021-06-30 08:47:55 -04:00
mm: pagewalk: Fix race between unmap and page walker
2022-10-15 07:54:36 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
mm/thp: fix __split_huge_pmd_locked() on shmem migration entry
2021-06-30 08:47:52 -04:00
vfs: fix readahead(2) on block devices
2023-11-20 10:30:08 +01:00
mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse
2022-09-05 10:27:46 +02:00
mm: revert "mm: shmem: fix data-race in shmem_getattr()"
2024-12-14 19:44:19 +01:00
mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag
2021-11-26 10:47:21 +01:00
mm: krealloc: Fix MTE false alarm in __do_krealloc
2024-11-08 16:20:54 +01:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
mm/sparse: add the missing sparse_buffer_fini() in error branch
2021-05-14 09:44:32 +02:00
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
mm/swapfile: skip HugeTLB pages for unuse_vma
2024-11-08 16:20:47 +01:00
mm/thp: unmap_mapping_page() to fix THP truncate_cleanup_page()
2021-06-30 08:47:53 -04:00
mm/usercopy: return 1 from hardened_usercopy __setup() handler
2022-04-15 14:18:30 +02:00
userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb
2024-03-01 13:13:33 +01:00
mm: only enforce minimum stack gap size if it's sensible
2024-11-08 16:20:35 +01:00
mm: add missing release barrier on PGDAT_RECLAIM_LOCKED unlock
2025-05-02 07:39:16 +02:00
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
2022-05-15 19:54:46 +02:00
mm/z3fold: fix potential memory leak in z3fold_destroy_pool()
2021-07-14 16:53:47 +02:00
zsmalloc: fix races between asynchronous zspage free and page migration
2022-06-06 08:33:50 +02:00
65af70aa56