The patch titled
Subject: mm/zsmalloc.c: combine two atomic ops in zs_pool_dec_isolated()
has been added to the -mm tree. Its filename is
mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated.patch
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/zsmalloc.c: combine two atomic ops in zs_pool_dec_isolated()
atomic_long_dec_and_test() is equivalent to atomic_long_dec() and
atomic_long_read() == 0. Use it to make code more succinct.
Link: https://lkml.kernel.org/r/20210624123930.1769093-3-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/mm/zsmalloc.c~mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated
+++ a/mm/zsmalloc.c
@@ -1828,13 +1828,12 @@ static void putback_zspage_deferred(stru
static inline void zs_pool_dec_isolated(struct zs_pool *pool)
{
VM_BUG_ON(atomic_long_read(&pool->isolated_pages) <= 0);
- atomic_long_dec(&pool->isolated_pages);
/*
* There's no possibility of racing, since wait_for_isolated_drain()
* checks the isolated count under &class->lock after enqueuing
* on migration_wait.
*/
- if (atomic_long_read(&pool->isolated_pages) == 0 && pool->destroying)
+ if (atomic_long_dec_and_test(&pool->isolated_pages) && pool->destroying)
wake_up_all(&pool->migration_wait);
}
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-swapfile-use-percpu_ref-to-serialize-against-concurrent-swapoff.patch
swap-fix-do_swap_page-race-with-swapoff.patch
mm-swap-remove-confusing-checking-for-non_swap_entry-in-swap_ra_info.patch
mm-shmem-fix-shmem_swapin-race-with-swapoff.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation-fix.patch
mm-swapfile-move-get_swap_page_of_type-under-config_hibernation-fix-2.patch
mm-swap-remove-unused-local-variable-nr_shadows.patch
mm-swap_slotsc-delete-meaningless-forward-declarations.patch
mm-huge_memoryc-remove-dedicated-macro-hpage_cache_index_mask.patch
mm-huge_memoryc-use-page-deferred_list.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled.patch
mm-huge_memoryc-add-missing-read-only-thp-checking-in-transparent_hugepage_enabled-v4.patch
mm-huge_memoryc-remove-unnecessary-tlb_remove_page_size-for-huge-zero-pmd.patch
mm-huge_memoryc-dont-discard-hugepage-if-other-processes-are-mapping-it.patch
mm-z3fold-define-macro-nchunks-as-total_chunks-zhdr_chunks.patch
mm-z3fold-avoid-possible-underflow-in-z3fold_alloc.patch
mm-z3fold-remove-magic-number-in-z3fold_create_pool.patch
mm-z3fold-remove-unused-function-handle_to_z3fold_header.patch
mm-z3fold-fix-potential-memory-leak-in-z3fold_destroy_pool.patch
mm-z3fold-use-release_z3fold_page_locked-to-release-locked-z3fold-page.patch
mm-zbud-reuse-unbuddied-as-buddied-in-zbud_pool.patch
mm-zbud-dont-export-any-zbud-api.patch
mm-zbud-dont-export-any-zbud-api-fix.patch
mm-zswapc-remove-unused-function-zswap_debugfs_exit.patch
mm-zswapc-avoid-unnecessary-copy-in-at-map-time.patch
mm-zswapc-fix-two-bugs-in-zswap_writeback_entry.patch
mm-zsmallocc-remove-confusing-code-in-obj_free.patch
mm-zsmallocc-combine-two-atomic-ops-in-zs_pool_dec_isolated.patch
mm-zsmallocc-improve-readability-for-async_free_zspage.patch
