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madvise MADV_DOEXEC preserves a memory range across exec. Initially
only supported for non-executable, non-stack, anonymous memory.
MADV_DOEXEC is single-use and after exec madvise must done again to
preserve memory for a subsequent exec.
MADV_DONTEXEC reverts the effect of a previous MADV_DOEXEC call and
undoes the preservation of the range.
Orabug: 32387884
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
(cherry picked from commit 5495dfe)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
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