linux-kernel - Re: [PATCH 1/2] x86/speculation: add cpu_show

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Date:   Wed, 9 Aug 2023 08:46:19 -0700
From:   Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To:     Arnd Bergmann <arnd@...nel.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/speculation: add cpu_show_gds() prototype

On 8/9/23 06:04, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added function has two definitions but no prototypes:
> 
> drivers/base/cpu.c:605:16: error: no previous prototype for 'cpu_show_gds' [-Werror=missing-prototypes]
> 
> Add a declaration next to the other ones for this file to avoid the
> warning.
> 
> Fixes: 8974eb588283b ("x86/speculation: Add Gather Data Sampling mitigation")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/cpu.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/cpu.h b/include/linux/cpu.h
> index 9d43b734170d6..0abd60a7987b6 100644
> --- a/include/linux/cpu.h
> +++ b/include/linux/cpu.h
> @@ -73,6 +73,8 @@ extern ssize_t cpu_show_retbleed(struct device *dev,
>  				 struct device_attribute *attr, char *buf);
>  extern ssize_t cpu_show_spec_rstack_overflow(struct device *dev,
>  					     struct device_attribute *attr, char *buf);
> +extern ssize_t cpu_show_gds(struct device *dev,
> +			    struct device_attribute *attr, char *buf);
>  
>  extern __printf(4, 5)
>  struct device *cpu_device_create(struct device *parent, void *drvdata,

Sorry I missed that. Shouldn't stable be CC'd here as well?

Thanks,
Dan