Re: [PATCH v2 1/2] tools: linux/types.h: Add 128-bit integer types for arm64 UAPI structures

[Jeremy Linton <jeremy.linton@arm.com>]

Hi,

Please consider this for all supported stable/LTS kernels.

Without this commit, older kernel trees will fail to build tools on 
systems running newer kernel headers.

Upstream commit:

10a47fb67340 ("tools: linux/types.h: Add 128-bit integer types for arm64 
UAPI structures")

Thanks,

Cc: stable@vger.kernel.org


On 6/26/26 9:17 AM, Will Deacon wrote:
> The arm64 UAPI exposes some 128-bit integer types to represent things
> such as fpsimd registers in the sigcontext. In preparation for defining
> these using the '__u128' typedef implemented by uapi/linux/types.h, copy
> that typedef over to the private linux/types.h header used by the tools
> directory.
> 
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: David Matlack <dmatlack@google.com>
> Signed-off-by: Will Deacon <will@kernel.org>
> ---
>   tools/include/linux/types.h | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/tools/include/linux/types.h b/tools/include/linux/types.h
> index d41f8a261bce..b6c473b7920d 100644
> --- a/tools/include/linux/types.h
> +++ b/tools/include/linux/types.h
> @@ -23,6 +23,11 @@ typedef enum {
>   	__GFP_HIGH
>   } gfp_t;
>   
> +#ifdef __SIZEOF_INT128__
> +typedef __signed__ __int128 __s128 __attribute__((aligned(16)));
> +typedef unsigned __int128 __u128 __attribute__((aligned(16)));
> +#endif
> +
>   /*
>    * We define u64 as uint64_t for every architecture
>    * so that we can print it with "%"PRIx64 without getting warnings.