Re: [PATCH] KVM: arm64: nvhe: Fix build failure with gcc

[Marc Zyngier <maz@kernel.org>]

On Tue, 10 Jun 2025 16:11:32 +0100,
"Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> wrote:
> 
> Address a build failure encountered with aarch64-linux-gnu-gcc version
> 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04)
> 
> /usr/bin/aarch64-linux-gnu-ld: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o: in function `__clock_mult_uint128':
> /linux/work/arch/arm64/kvm/hyp/nvhe/clock.c:27:(.hyp.text+0x120d8): undefined reference to `__kvm_nvhe___lshrti3'
> /linux/work/arch/arm64/kvm/hyp/nvhe/clock.c:27:(.hyp.text+0x120d8): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `__kvm_nvhe___lshrti3'

$ ls -l arch/arm64/kvm/hyp/nvhe/clock.c
ls: cannot access 'arch/arm64/kvm/hyp/nvhe/clock.c': No such file or directory

> 
> Similar to commit 9bfe7553fadb ("arm64: Implement __lshrti3 library function"),
> this change use the added helper.
> 
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Oliver Upton <oliver.upton@linux.dev>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Zenghui Yu <yuzenghui@huawei.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> 
> Suggested-by: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

What was recently introduced that triggers this? I'd like to
understand what mandates it, and avoid it of at all possible.

	M.

-- 
Jazz isn't dead. It just smells funny.