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SubjectRe: [PATCH v5 11/17] arm64: docs: document pointer authentication
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>> +
>> +When CONFIG_ARM64_PTR_AUTH is selected, and relevant HW support is
>> +present, the kernel will assign a random APIAKey value to each process
>> +at exec*() time. This key is shared by all threads within the process,
>> +and the key is preserved across fork(). Presence of functionality using
>> +APIAKey is advertised via HWCAP_APIA.
>
> It might be useful to include documentation here on how many bits of
> the address are being used for the PAC bits (I'm assuming it's 7?)


the number of bits available depends on the VA size, so you can't really
document a number.

Ramana

>
> -Kees
>

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