The patch titled Subject: test_maple_tree: add more testing for mas_empty_area() has been added to the -mm mm-hotfixes-unstable branch. Its filename is test_maple_tree-add-more-testing-for-mas_empty_area.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: "Liam R. Howlett" Liam.Howlett@oracle.com Subject: test_maple_tree: add more testing for mas_empty_area() Date: Thu, 2 Mar 2023 21:15:40 -0500

Test robust filling of an entire area of the tree, then test one beyond. This is to test the walking back up the tree at the end of nodes and error condition.

Test inspired by the reproducer code provided by Snild Dolkow.

Link: https://lkml.kernel.org/r/20230303021540.1056603-2-Liam.Howlett@oracle.com Link: https://lore.kernel.org/linux-mm/cb8dc31a-fef2-1d09-f133-e9f7b9f9e77a@sony.c... Fixes: e15e06a83923 ("lib/test_maple_tree: add testing for maple tree") Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Cc: Snild Dolkow snild@sony.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

--- a/lib/test_maple_tree.c~test_maple_tree-add-more-testing-for-mas_empty_area +++ a/lib/test_maple_tree.c @@ -2670,6 +2670,36 @@ static noinline void check_empty_area_wi rcu_read_unlock(); }

+static noinline void check_empty_area_fill(struct maple_tree *mt) +{ + int loop, shift; + unsigned long max = 0x25D78000; + unsigned long size; + MA_STATE(mas, mt, 0, 0); + + mt_set_non_kernel(99999); + for (shift = 12; shift <= 16; shift++) { + loop = 5000; + size = 1 << shift; + while (loop--) { + mas_lock(&mas); + MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != 0); + MT_BUG_ON(mt, mas.last != mas.index + size - 1); + mas_store_gfp(&mas, &check_empty_area_fill, GFP_KERNEL); + mas_unlock(&mas); + mas_reset(&mas); + } + } + + /* No space left. */ + size = 0x1000; + rcu_read_lock(); + MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != -EBUSY); + rcu_read_unlock(); + + mt_set_non_kernel(0); +} + static DEFINE_MTREE(tree); static int maple_tree_seed(void) { @@ -2926,6 +2956,11 @@ static int maple_tree_seed(void) check_empty_area_window(&tree); mtree_destroy(&tree);

+ mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE); + check_empty_area_fill(&tree); + mtree_destroy(&tree); + + #if defined(BENCH) skip: #endif _

Patches currently in -mm which might be from Liam.Howlett@oracle.com are

mm-mprotect-fix-successful-vma_merge-of-next-in-do_mprotect_pkey.patch maple_tree-fix-mas_skip_node-end-slot-detection.patch test_maple_tree-add-more-testing-for-mas_empty_area.patch maple_tree-be-more-cautious-about-dead-nodes.patch maple_tree-detect-dead-nodes-in-mas_start.patch maple_tree-fix-freeing-of-nodes-in-rcu-mode.patch maple_tree-remove-extra-smp_wmb-from-mas_dead_leaves.patch maple_tree-fix-write-memory-barrier-of-nodes-once-dead-for-rcu-mode.patch maple_tree-add-smp_rmb-to-dead-node-detection.patch maple_tree-add-rcu-lock-checking-to-rcu-callback-functions.patch mm-enable-maple-tree-rcu-mode-by-default.patch