riscv: Start of DRAM should at least be aligned on PMD size for the direct mapping

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commit c3bcc65d4d upstream.

So that we do not end up mapping the whole linear mapping using 4K
pages, which is slow at boot time, and also very likely at runtime.

So make sure we align the start of DRAM on a PMD boundary.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reported-by: Song Shuai <suagrfillet@gmail.com>
Fixes: 3335068f87 ("riscv: Use PUD/P4D/PGD pages for the linear mapping")
Tested-by: Song Shuai <suagrfillet@gmail.com>
Link: https://lore.kernel.org/r/20230704121837.248976-1-alexghiti@rivosinc.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Alexandre Ghiti 2023-07-04 14:18:37 +02:00 • committed by Greg Kroah-Hartman

parent 24555c3794

commit 8486218eb6

1 changed files with 6 additions and 1 deletions

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arch/riscv/mm/init.c

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