mm/mmap.c: mark protection_map as __ro_after_init
The protection map is only modified by per-arch init code so it can be protected from writes after the init code runs. This change was extracted from PaX where it's part of KERNEXEC. Link: http://lkml.kernel.org/r/20170510174441.26163-1-danielmicay@gmail.comSigned-off-by: NDaniel Micay <danielmicay@gmail.com> Acked-by: NKees Cook <keescook@chromium.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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