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riscv: Fix P4D_SHIFT definition for 3-level page table mode
[ Upstream commit 71fc362 ] RISC-V kernels support 3,4,5-level page tables at runtime by folding upper levels. In case of a 3-level page table, PGDIR is folded into P4D which in turn is folded into PUD: PGDIR_SHIFT value is correctly set to the same value as PUD_SHIFT, but P4D_SHIFT is not, then any use of P4D_SHIFT will access invalid address bits (all set to 1). Fix this by dynamically defining P4D_SHIFT value, like we already do for PGDIR_SHIFT. Fixes: d10efa2 ("riscv: mm: Control p4d's folding by pgtable_l5_enabled") Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> Link: https://lore.kernel.org/r/20221201135128.1482189-2-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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