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riscv: Start of DRAM should at least be aligned on PMD size for the d…
…irect mapping commit c3bcc65 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: 3335068 ("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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