commit 4f78252da8 upstream.
Patch series "Some randome fixes and cleanups to swapfile".
Patch 0-3 are some random fixes. Patch 4 is a cleanup. More details can
be found in respective patches.
This patch (of 4):
When folio_alloc_swap() encounters a failure in either
mem_cgroup_try_charge_swap() or add_to_swap_cache(), nr_swap_pages counter
is not decremented for allocated entry. However, the following
put_swap_folio() will increase nr_swap_pages counter unpairly and lead to
an imbalance.
Move nr_swap_pages decrement from folio_alloc_swap() to swap_range_alloc()
to pair the nr_swap_pages counting.
Link: https://lkml.kernel.org/r/20250522122554.12209-1-shikemeng@huaweicloud.com
Link: https://lkml.kernel.org/r/20250522122554.12209-2-shikemeng@huaweicloud.com
Fixes: 0ff67f990b ("mm, swap: remove swap slot cache")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Kairui Song <kasong@tencent.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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