[PATCH v2] thp: Disable THP if THP isn't supported by kernel

[H.J. Lu]

Since DL_MAP_DEFAULT_THP_PAGESIZE is defined for x86-64, THP control
is to set to madvise by default.  If THP is disabled in x86-64 kernel,
madvise (..., MADV_HUGEPAGE) returns -EINVAL to indicate that THP isn't
supported.  Add _dl_thp_madvise to disable THP in this case.  This
fixes BZ #34348.


-- 
H.J.
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