[PATCH v5 1/3] arm64/hwcap: Document allocation of upper bits of AT_HWCAP

[Szabolcs Nagy]

The 07/07/2022 11:36, Mark Brown wrote:
> The top two bits of AT_HWCAP are reserved for use by glibc and the rest of
> the top 32 bits are being kept unallocated for potential use by glibc.
> Document this in the header.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>

Acked-by: Szabolcs Nagy <szabolcs.nagy at arm.com>

> ---
>  arch/arm64/include/uapi/asm/hwcap.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h
> index 4bb2cc8ac446..fd7577cf8e77 100644
> --- a/arch/arm64/include/uapi/asm/hwcap.h
> +++ b/arch/arm64/include/uapi/asm/hwcap.h
> @@ -19,6 +19,9 @@
>  
>  /*
>   * HWCAP flags - for AT_HWCAP
> + *
> + * Bits 62 and 63 are reserved for use by libc.
> + * Bits 32-61 are unallocated for potential use by libc.
>   */
>  #define HWCAP_FP		(1 << 0)
>  #define HWCAP_ASIMD		(1 << 1)
> -- 
> 2.30.2
>