Re: [PATCH v2 0/2] Use __u128 in arm64 UAPI headers

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

Hi,

On 6/26/26 9:17 AM, Will Deacon wrote:
> Hi folks,
> 
> This is version two of the patch I previously sent here:
> 
>    https://lore.kernel.org/r/20260619130835.5678-1-will@kernel.org
> 
> I even briefly queued that version up, but it exploded spectacularly
> when building the kselftests for arm64 [1] [2]. So the only change since
> v1 is the addition of a preliminary patch that adds the '__u128' typedef
> to the private copy of linux/types.h used by the tools/ directory.
> 
> I plan to take this all via the arm64 tree unless anybody objects.

This seems to be creating a interesting situation that the follow-on 
commit:
10a47fb67340 tools: linux/types.h: Add 128-bit integer types for arm64 
UAPI structures

Is missing from older kernel tooling/etc, which means the tools that end 
up pulling this header in won't build on machines running 7.3 kernel 
headers.

AKA, build/install master, switch back to an older branch and discover 
say bpftool won't build anymore.



Thanks,


> 
> Cheers,
> 
> Will
> 
> [1] https://lore.kernel.org/r/202606240441.7eZ1TIRM-lkp@intel.com
> [2] https://lore.kernel.org/r/ajvGS7UBpWzJtzkw@sirena.org.uk
> 
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
> Cc: David Matlack <dmatlack@google.com>
> Cc: Steffen Eiden <seiden@linux.ibm.com>
> Cc: Andreas Grapentin <gra@linux.ibm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Dave Martin <dave.martin@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Marc Zyngier <maz@kernel.org>
> 
> --->8
> 
> Will Deacon (2):
>    tools: linux/types.h: Add 128-bit integer types for arm64 UAPI
>      structures
>    arm64: uapi: Use __u128 instead of __uint128_t in UAPI headers
> 
>   arch/arm64/include/uapi/asm/ptrace.h     | 12 ++++++------
>   arch/arm64/include/uapi/asm/sigcontext.h |  6 +++---
>   tools/include/linux/types.h              |  5 +++++
>   3 files changed, 14 insertions(+), 9 deletions(-)
>