Re: [PATCH] arm64: uapi: Use __u128 instead of __uint128_t in UAPI headers

[Marc Zyngier <maz@kernel.org>]

On Fri, 19 Jun 2026 14:08:34 +0100,
Will Deacon <will@kernel.org> wrote:
> 
> The arm64 UAPI exposes '__uint128_t' types in the members of
> 'struct user_fpsimd_state', 'struct user_pac_address_keys' and in the
> signal frame via 'struct fpsimd_context'. Since the alignment of such
> a type appears to be non-portable (16 bytes on arm64, 8 bytes on s390),
> prefer the '__u128' typedef from uapi/linux/types.h, which makes the
> alignment explicit and allows the definitions to be reused by other
> host architectures.
> 
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.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>
> Signed-off-by: Will Deacon <will@kernel.org>

FWIW:

Reviewed-by: Marc Zyngier <maz@kernel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.