Re: [PATCH v4 4/4] aarch64: Add explicit checks for implicit LSE/LSE2 requirements.

2024-01-25 Thread Richard Sandiford
Victor Do Nascimento writes: > At present, Evaluation of both `has_lse2(hwcap)' and > `has_lse128(hwcap)' may require issuing an `mrs' instruction to query > a system register. This instruction, when issued from user-space > results in a trap by the kernel which then returns the value read in > b

[PATCH v4 4/4] aarch64: Add explicit checks for implicit LSE/LSE2 requirements.

2024-01-24 Thread Victor Do Nascimento
At present, Evaluation of both `has_lse2(hwcap)' and `has_lse128(hwcap)' may require issuing an `mrs' instruction to query a system register. This instruction, when issued from user-space results in a trap by the kernel which then returns the value read in by the system register. Given the undesi