On Fri, 29 Sep 2023 14:11:56 PDT (-0700), samitolvanen@xxxxxxxxxx wrote:
Hi all,
We noticed that 64-bit RISC-V kernels limit mmap_rnd_bits to 24
even if the hardware supports a larger virtual address space size
[1]. These two patches allow mmap_rnd_bits_max to be changed during
init, and bumps up the maximum randomness if we end up setting up
4/5-level paging at boot.
Sorry for missing this, I'm just poking through old stuff in patchwork.
As far as I can tell this is still relevant, the discussions are just on
the mmap() bits (but we'd already screwed that one up and have since
fixed it).
So
Reviewed-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
in case someone else wants to take it, but I'm OK taking that MM patch
with Kees' review.
Sami
[1] https://github.com/google/android-riscv64/issues/1
Sami Tolvanen (2):
mm: Change mmap_rnd_bits_max to __ro_after_init
riscv: mm: Update mmap_rnd_bits_max
arch/riscv/mm/init.c | 6 ++++++
include/linux/mm.h | 2 +-
mm/mmap.c | 2 +-
3 files changed, 8 insertions(+), 2 deletions(-)
base-commit: 6465e260f48790807eef06b583b38ca9789b6072
