linux-kernel - Re: [PATCH 3/3] x86/bugs: spectre_v2_user default mode depends on main default

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Date: Mon, 22 Jan 2024 16:04:31 -0800
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Breno Leitao <leitao@...ian.org>
Cc: mingo@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] x86/bugs: spectre_v2_user default mode depends on
 main default

On Thu, Jan 18, 2024 at 09:32:13AM -0800, Breno Leitao wrote:
>  static enum spectre_v2_user_cmd __init
>  spectre_v2_parse_user_cmdline(void)
>  {
> +	int ret, i, mode;

mode is being returned, it is better to match its type with function's
return type "enum spectre_v2_user_cmd".

>  	char arg[20];
> -	int ret, i;
> +
> +	mode = IS_ENABLED(CONFIG_MITIGATION_SPECTRE_V2) ?
> +		SPECTRE_V2_USER_CMD_AUTO : SPECTRE_V2_USER_CMD_NONE;
>  
>  	switch (spectre_v2_cmd) {
>  	case SPECTRE_V2_CMD_NONE:
> @@ -1236,7 +1239,7 @@ spectre_v2_parse_user_cmdline(void)
>  	ret = cmdline_find_option(boot_command_line, "spectre_v2_user",
>  				  arg, sizeof(arg));
>  	if (ret < 0)
> -		return SPECTRE_V2_USER_CMD_AUTO;
> +		return mode;
>  
>  	for (i = 0; i < ARRAY_SIZE(v2_user_options); i++) {
>  		if (match_option(arg, ret, v2_user_options[i].option)) {
> @@ -1246,8 +1249,8 @@ spectre_v2_parse_user_cmdline(void)
>  		}
>  	}
>  
> -	pr_err("Unknown user space protection option (%s). Switching to AUTO select\n", arg);
> -	return SPECTRE_V2_USER_CMD_AUTO;
> +	pr_err("Unknown user space protection option (%s). Switching to default\n", arg);
> +	return mode;
>  }
>  
>  static inline bool spectre_v2_in_ibrs_mode(enum spectre_v2_mitigation mode)
> -- 
> 2.34.1
>