linux-kernel - Re: [PATCH v3 4/5] arm64: kvm: Adopt new alternative assembler macros

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Message-ID: <20150722151739.GM6650@arm.com>
Date:	Wed, 22 Jul 2015 16:17:39 +0100
From:	Will Deacon <will.deacon@....com>
To:	Daniel Thompson <daniel.thompson@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Andre Przywara <Andre.Przywara@....com>
Subject: Re: [PATCH v3 4/5] arm64: kvm: Adopt new alternative assembler macros

Marc, Christoffer,

On Wed, Jul 22, 2015 at 12:21:04PM +0100, Daniel Thompson wrote:
> Convert the dynamic patching for ARM64_HAS_SYSREG_GIC_CPUIF over to
> the newly added alternative assembler macros.

Do you mind if I take this via the arm64 tree? It won't apply in
isolation and I'd expect conflicts to be small/trivial to resolve.

Cheers,

Will

> ---
>  arch/arm64/kvm/hyp.S | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
> index 17a8fb14f428..10915aaf0b01 100644
> --- a/arch/arm64/kvm/hyp.S
> +++ b/arch/arm64/kvm/hyp.S
> @@ -810,7 +810,11 @@
>   * Call into the vgic backend for state saving
>   */
>  .macro save_vgic_state
> -	alternative_insn "bl __save_vgic_v2_state", "bl __save_vgic_v3_state", ARM64_HAS_SYSREG_GIC_CPUIF
> +alternative_if_not ARM64_HAS_SYSREG_GIC_CPUIF
> +	bl	__save_vgic_v2_state
> +alternative_else
> +	bl	__save_vgic_v3_state
> +alternative_endif
>  	mrs	x24, hcr_el2
>  	mov	x25, #HCR_INT_OVERRIDE
>  	neg	x25, x25
> @@ -827,7 +831,11 @@
>  	orr	x24, x24, #HCR_INT_OVERRIDE
>  	orr	x24, x24, x25
>  	msr	hcr_el2, x24
> -	alternative_insn "bl __restore_vgic_v2_state", "bl __restore_vgic_v3_state", ARM64_HAS_SYSREG_GIC_CPUIF
> +alternative_if_not ARM64_HAS_SYSREG_GIC_CPUIF
> +	bl	__restore_vgic_v2_state
> +alternative_else
> +	bl	__restore_vgic_v3_state
> +alternative_endif
>  .endm
>  
>  .macro save_timer_state
> -- 
> 2.4.3
> 
--
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