linux-kernel - Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility

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Message-ID: <YAwjVVJM2LSswjvC@Catalins-MacBook-Air.local>
Date:   Sat, 23 Jan 2021 13:23:33 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line
 cpufeature override facility

On Mon, Jan 18, 2021 at 09:45:24AM +0000, Marc Zyngier wrote:
> diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
> index d74e5f84042e..b3c4dd04f74b 100644
> --- a/arch/arm64/kernel/head.S
> +++ b/arch/arm64/kernel/head.S
> @@ -435,6 +435,7 @@ SYM_FUNC_START_LOCAL(__primary_switched)
>  
>  	mov	x0, x21				// pass FDT address in x0
>  	bl	early_fdt_map			// Try mapping the FDT early
> +	bl	init_shadow_regs
>  	bl	switch_to_vhe
>  #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
>  	bl	kasan_early_init
[...]
> +void __init init_shadow_regs(void)

Do we need an asmlinkage here? And a declaration somewhere to silence
sparse (we did this for entry-common.c function even if the .S files
don't consume the prototypes).

-- 
Catalin