[PATCH v4 01/22] aarch64: Add HWCAP_GCS

[Carlos O'Donell]

On 11/29/24 11:37 AM, Yury Khrustalev wrote:
> From: Szabolcs Nagy <szabolcs.nagy@arm.com>
> 
> Use upper 32 bits of HWCAP.

This can't go in until a Linux kernel is released with this constant
since this is bits/hwcap.h and is included in sys/auxv.h and would
make the constant visible to the users.

You use HWCAP_GCS internally in a couple of places, so you could
put this into another header temporarily to support building
glibc without exposing the constant in the release.

> ---
>  sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h b/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
> index 2fa158fcc0..47836eb414 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
> +++ b/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
> @@ -54,6 +54,7 @@
>  #define HWCAP_SB		(1 << 29)
>  #define HWCAP_PACA		(1 << 30)
>  #define HWCAP_PACG		(1UL << 31)
> +#define HWCAP_GCS		(1UL << 32)
>  
>  #define HWCAP2_DCPODP		(1 << 0)
>  #define HWCAP2_SVE2		(1 << 1)

Cheers,
Carlos.