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riscv: Define TASK_SIZE_MAX for __access_ok() #728

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riscv: Define TASK_SIZE_MAX for __access_ok() #728

wants to merge 1 commit into from

Commits on Mar 25, 2024

  1. riscv: Define TASK_SIZE_MAX for __access_ok() 

    TASK_SIZE_MAX should be set to the largest userspace address under any
runtime configuration. This optimizes the check in __access_ok(), which
no longer needs to compute the current value of TASK_SIZE. It is still
safe because addresses between TASK_SIZE and TASK_SIZE_MAX are invalid
at the hardware level.

This removes about half of the references to pgtable_l[45]_enabled.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
    @SiFiveHolland
    SiFiveHolland authored and Björn Töpel committed Mar 25, 2024
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