hugetlb: replace the obsolete hugetlb_instantiation_mutex in the comments
After commit 8382d914 ("mm, hugetlb: improve page-fault scalability"), the hugetlb_instantiation_mutex lock had been replaced by hugetlb_fault_mutex_table to serializes faults on the same logical page. Thus update the obsolete hugetlb_instantiation_mutex related comments. Link: https://lkml.kernel.org/r/4b3febeae37455ff7b74aa0aad16cc6909cf0926.1634797639.git.baolin.wang@linux.alibaba.comSigned-off-by: NBaolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by: NMike Kravetz <mike.kravetz@oracle.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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