[PATCH v2] arm64: cpufeature: Fix the visibility of compat hwcaps

[Suzuki K Poulose]

Hi Amit

On 02/11/2022 10:21, Amit Daniel Kachhap wrote:
> Commit 237405ebef58 ("arm64: cpufeature: Force HWCAP to be based on the
> sysreg visible to user-space") forced the hwcaps to use sanitised
> user-space view of the id registers. However, the ID register structures
> used to select few compat cpufeatures (vfp, crc32, ...) are masked and
> hence such hwcaps do not appear in /proc/cpuinfo anymore for PER_LINUX32
> personality.
> 
> Add the ID register structures explicitly and set the relevant entry as
> visible for compat hwcaps.
> 
> While at it, update the comment for structure ftr_generic_32bits[] which
> lists the ID register that use it.
> 

Minor nit: With this change, we expose mvfr*_el1 and the following
document needs an update to reflect the change.

Documentation/arm64/cpu-feature-registers.rst

Otherwise, looks good to me.

Suzuki