linux-kernel - Re: [PATCH 2/5] efibc: Fix excessive stack footprint warning

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Message-ID: <20160511124338.GW2839@codeblueprint.co.uk>
Date:	Wed, 11 May 2016 13:43:38 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	"Compostella, Jeremy" <jeremy.compostella@...el.com>
Cc:	"Elliott, Robert (Persistent Memory)" <elliott@....com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H . Peter Anvin" <hpa@...or.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/5] efibc: Fix excessive stack footprint warning

On Tue, 10 May, at 10:40:22AM, Jeremy Compostella wrote:
> Why not.  See patch as attachment.
> 
> Thanks,
> 
> Jérémy
> 

> From 8a9b07e2d7242fa8a36157f1025202a96c3c7c9a Mon Sep 17 00:00:00 2001
> From: Jeremy Compostella <jeremy.compostella@...el.com>
> Date: Tue, 10 May 2016 10:34:21 +0200
> Subject: [PATCH] efibc: report the EFI variable name in the error messages
> 
> Report the name of the EFI variable if the value is incorrect or if
> efibc_set_variable() fails to allocate the struct efivar_entry object.
> 
> Signed-off-by: Jeremy Compostella <jeremy.compostella@...el.com>
> ---
>  drivers/firmware/efi/efibc.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/firmware/efi/efibc.c b/drivers/firmware/efi/efibc.c
> index cb4f573..93d34a1 100644
> --- a/drivers/firmware/efi/efibc.c
> +++ b/drivers/firmware/efi/efibc.c
> @@ -37,13 +37,14 @@ static int efibc_set_variable(const char *name, const char *value)
>  	size_t size = (strlen(value) + 1) * sizeof(efi_char16_t);
>  
>  	if (size > sizeof(entry->var.Data)) {
> -		pr_err("value is too large");
> +		pr_err("value is too large for %s EFI variable", name);
>  		return -EINVAL;
>  	}

It'd be a good idea to print 'size' too.

>  
>  	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
>  	if (!entry) {
> -		pr_err("failed to allocate efivar entry");
> +		pr_err("failed to allocate efivar entry for %s EFI variable",
> +		       name);
>  		return -ENOMEM;
>  	}

Aren't these pr_err() calls missing newline characters?