linux-kernel - Re: [PATCH] x86/sgx: fix the return type of sgx

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Date:   Thu, 14 Jan 2021 12:12:12 +0000
From:   Darren Kenny <darren.kenny@...cle.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH] x86/sgx: fix the return type of sgx_init

On Wednesday, 2021-01-13 at 15:23:11 -08, Sami Tolvanen wrote:
> device_initcall() expects a function of type initcall_t, which returns
> an integer. Change the signature of sgx_init() to match.
>
> Fixes: e7e0545299d8c ("x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections")
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Makes sense.

Reviewed-by: Darren Kenny <darren.kenny@...cle.com>

> ---
>  arch/x86/kernel/cpu/sgx/main.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> index c519fc5f6948..8df81a3ed945 100644
> --- a/arch/x86/kernel/cpu/sgx/main.c
> +++ b/arch/x86/kernel/cpu/sgx/main.c
> @@ -700,25 +700,27 @@ static bool __init sgx_page_cache_init(void)
>  	return true;
>  }
>  
> -static void __init sgx_init(void)
> +static int __init sgx_init(void)
>  {
>  	int ret;
>  	int i;
>  
>  	if (!cpu_feature_enabled(X86_FEATURE_SGX))
> -		return;
> +		return -ENODEV;
>  
>  	if (!sgx_page_cache_init())
> -		return;
> +		return -ENOMEM;
>  
> -	if (!sgx_page_reclaimer_init())
> +	if (!sgx_page_reclaimer_init()) {
> +		ret = -ENOMEM;
>  		goto err_page_cache;
> +	}
>  
>  	ret = sgx_drv_init();
>  	if (ret)
>  		goto err_kthread;
>  
> -	return;
> +	return 0;
>  
>  err_kthread:
>  	kthread_stop(ksgxd_tsk);
> @@ -728,6 +730,8 @@ static void __init sgx_init(void)
>  		vfree(sgx_epc_sections[i].pages);
>  		memunmap(sgx_epc_sections[i].virt_addr);
>  	}
> +
> +	return ret;
>  }
>  
>  device_initcall(sgx_init);
>
> base-commit: 65f0d2414b7079556fbbcc070b3d1c9f9587606d
> -- 
> 2.30.0.284.gd98b1dd5eaa7-goog