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Revert "mm: mmap: allow for the maximum number of bits for randomizin…
…g mmap_base by default" commit 14d7c92 upstream. This reverts commit 3afb76a. This was a wrongheaded workaround for an issue that had already been fixed much better by commit 4ef9ad1 ("mm: huge_memory: don't force huge page alignment on 32 bit"). Asking users questions at kernel compile time that they can't make sense of is not a viable strategy. And the fact that even the kernel VM maintainers apparently didn't catch that this "fix" is not a fix any more pretty much proves the point that people can't be expected to understand the implications of the question. It may well be the case that we could improve things further, and that __thp_get_unmapped_area() should take the mapping randomization into account even for 64-bit kernels. Maybe we should not be so eager to use THP mappings. But in no case should this be a kernel config option. Cc: Rafael Aquini <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Jiri Slaby <[email protected]> Cc: Suren Baghdasaryan <[email protected]> Cc: Matthew Wilcox (Oracle) <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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