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Patch series "Cleanup and fixup for hugetlb", v2.

This series contains cleanups to remove redundant VM_BUG_ON() and simplify
the return code.  Also this handles the error case in
hugetlb_fix_reserve_counts() correctly.  More details can be found in the
respective changelogs.

This patch (of 5):

The same VM_BUG_ON() check is already done in the callee.  Remove this
extra one to simplify the code slightly.

Link: https://lkml.kernel.org/r/20210410072348.20437-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20210410072348.20437-2-linmiaohe@huawei.com

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Feilong Lin <linfeilong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>