linux-kernel - Re: [PATCH] RISC-V: Add a non-void return for sbi v02 functions

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Date:   Mon, 22 Feb 2021 12:22:41 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] RISC-V: Add a non-void return for sbi v02 functions

On Wed, Feb 03, 2021 at 09:26:43PM -0800, Atish Patra wrote:
> SBI v0.2 functions can return an error code from SBI implementation.
> We are already processing the SBI error code and coverts it to the Linux
> error code.
> 
> Propagate to the error code to the caller as well. As of now, kvm is the
> only user of these error codes.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
...
>  #else /* CONFIG_RISCV_SBI */
> -static inline void sbi_remote_fence_i(const unsigned long *hart_mask) {}
> +static inline int sbi_remote_fence_i(const unsigned long *hart_mask) {}

Error log:
In file included from arch/riscv/kernel/setup.c:29:
arch/riscv/include/asm/sbi.h: In function 'sbi_remote_fence_i':
arch/riscv/include/asm/sbi.h:150:1: error: no return statement in function returning non-void

Guenter