From: Marc Zyngier <maz@kernel.org>
To: Andrew Scull <ascull@google.com>
Cc: kernel-team@android.com, suzuki.poulose@arm.com,
catalin.marinas@arm.com, james.morse@arm.com,
linux-arm-kernel@lists.infradead.org,
Sudeep Holla <sudeep.holla@arm.com>,
will@kernel.org, kvmarm@lists.cs.columbia.edu,
julien.thierry.kdev@gmail.com
Subject: Re: [PATCH v3 14/18] smccc: Cast arguments to unsigned long
Date: Mon, 07 Sep 2020 14:33:17 +0100 [thread overview]
Message-ID: <87r1rdlnj6.wl-maz@kernel.org> (raw)
In-Reply-To: <20200903135307.251331-15-ascull@google.com>
On Thu, 03 Sep 2020 14:53:03 +0100,
Andrew Scull <ascull@google.com> wrote:
>
> To avoid warning about implicit casting, make the casting explicit. This
> allows, for example, pointers to be used as arguments as are used in the
> KVM hyp interface.
>
> Cc: Sudeep Holla <sudeep.holla@arm.com>
> Signed-off-by: Andrew Scull <ascull@google.com>
> ---
> include/linux/arm-smccc.h | 20 ++++++++++----------
> 1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
> index 15c706fb0a37..3bb109a35554 100644
> --- a/include/linux/arm-smccc.h
> +++ b/include/linux/arm-smccc.h
> @@ -260,7 +260,7 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
> typeof(a1) __a1 = a1; \
> struct arm_smccc_res *___res = res; \
> register unsigned long r0 asm("r0") = (u32)a0; \
> - register unsigned long r1 asm("r1") = __a1; \
> + register unsigned long r1 asm("r1") = (unsigned long)__a1; \
Given the pain we go through to extract the type of each argument, it
seems odd to end-up with casts everywhere. I'd rather keep the type
system alive by having:
register typeof(a1) r1 asm("r1") = __a1;
Is there any reason why this doesn't work?
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2020-09-07 13:34 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 13:52 [PATCH v3 00/18] Introduce separate nVHE hyp context Andrew Scull
2020-09-03 13:52 ` [PATCH v3 01/18] KVM: arm64: Remove __activate_vm wrapper Andrew Scull
2020-09-03 13:52 ` [PATCH v3 02/18] KVM: arm64: Remove hyp_panic arguments Andrew Scull
2020-09-07 10:21 ` Marc Zyngier
2020-09-03 13:52 ` [PATCH v3 03/18] KVM: arm64: Remove kvm_host_data_t typedef Andrew Scull
2020-09-03 13:52 ` [PATCH v3 04/18] KVM: arm64: Restrict symbol aliasing to outside nVHE Andrew Scull
2020-09-07 10:38 ` Marc Zyngier
2020-09-08 10:13 ` Andrew Scull
2020-09-03 13:52 ` [PATCH v3 05/18] KVM: arm64: Save chosen hyp vector to a percpu variable Andrew Scull
2020-09-03 13:52 ` [PATCH v3 06/18] KVM: arm64: nVHE: Use separate vector for the host Andrew Scull
2020-09-07 11:38 ` Marc Zyngier
2020-09-08 10:29 ` Andrew Scull
2020-09-03 13:52 ` [PATCH v3 07/18] KVM: arm64: nVHE: Don't consume host SErrors with ESB Andrew Scull
2020-09-07 11:46 ` Marc Zyngier
2020-09-03 13:52 ` [PATCH v3 08/18] KVM: arm64: Introduce hyp context Andrew Scull
2020-09-07 13:29 ` Marc Zyngier
2020-09-08 10:52 ` Andrew Scull
2020-09-03 13:52 ` [PATCH v3 09/18] KVM: arm64: Update context references from host to hyp Andrew Scull
2020-09-03 13:52 ` [PATCH v3 10/18] KVM: arm64: Restore hyp when panicking in guest context Andrew Scull
2020-09-03 13:53 ` [PATCH v3 11/18] KVM: arm64: Share context save and restore macros Andrew Scull
2020-09-03 13:53 ` [PATCH v3 12/18] KVM: arm64: nVHE: Switch to hyp context for EL2 Andrew Scull
2020-09-07 13:02 ` Marc Zyngier
2020-09-08 10:42 ` Andrew Scull
2020-09-03 13:53 ` [PATCH v3 13/18] KVM: arm64: nVHE: Handle hyp panics Andrew Scull
2020-09-07 13:24 ` Marc Zyngier
2020-09-03 13:53 ` [PATCH v3 14/18] smccc: Cast arguments to unsigned long Andrew Scull
2020-09-07 13:33 ` Marc Zyngier [this message]
2020-09-08 10:58 ` Andrew Scull
2020-09-03 13:53 ` [PATCH v3 15/18] KVM: arm64: nVHE: Pass pointers consistently to hyp-init Andrew Scull
2020-09-03 13:53 ` [PATCH v3 16/18] KVM: arm64: nVHE: Migrate hyp interface to SMCCC Andrew Scull
2020-09-07 13:47 ` Marc Zyngier
2020-09-07 14:20 ` Marc Zyngier
2020-09-08 11:02 ` Andrew Scull
2020-09-09 8:30 ` Andrew Scull
2020-09-03 13:53 ` [PATCH v3 17/18] KVM: arm64: nVHE: Migrate hyp-init " Andrew Scull
2020-09-03 13:53 ` [PATCH v3 18/18] KVM: arm64: nVHE: Fix pointers during SMCCC convertion Andrew Scull
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