linux-kernel - Re: [PATCH v2 17/19] crypto: x86 - standardize suboptimal prints

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Date:   Wed, 12 Oct 2022 18:38:56 -0600
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Robert Elliott <elliott@....com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        tim.c.chen@...ux.intel.com, ap420073@...il.com, ardb@...nel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 17/19] crypto: x86 - standardize suboptimal prints

On Wed, Oct 12, 2022 at 04:59:29PM -0500, Robert Elliott wrote:
> Reword prints that the module is not being loaded (although
> it otherwise qualifies) because performance would be suboptimal
> on the particular CPU model.
> 
> Although modules are not supposed to print unless they're loaded
> and active, this is an existing exception.
> 
> Signed-off-by: Robert Elliott <elliott@....com>
> ---
>  arch/x86/crypto/blowfish_glue.c     | 5 +----
>  arch/x86/crypto/camellia_glue.c     | 5 +----
>  arch/x86/crypto/des3_ede_glue.c     | 2 +-
>  arch/x86/crypto/twofish_glue_3way.c | 5 +----
>  4 files changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/x86/crypto/blowfish_glue.c b/arch/x86/crypto/blowfish_glue.c
> index 27b7aed9a488..8d4ecf406dee 100644
> --- a/arch/x86/crypto/blowfish_glue.c
> +++ b/arch/x86/crypto/blowfish_glue.c
> @@ -320,10 +320,7 @@ static int __init blowfish_init(void)
>  		return -ENODEV;
>  
>  	if (!force && is_blacklisted_cpu()) {
> -		printk(KERN_INFO
> -			"blowfish-x86_64: performance on this CPU "
> -			"would be suboptimal: disabling "
> -			"blowfish-x86_64.\n");
> +		pr_info("CPU-optimized crypto module not loaded, crypto optimization performance on this CPU would be suboptimal\n");

This is a comma splice. You need some sort of conjunction.

But also: it's not like the user can do anything about this. Why clutter
dmesg? Seems like we'd be better off without these messages?