linux-kernel - Re: [PATCH 2/4] arm: dump: no need to check return value of debugfs

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Date:   Wed, 23 Jan 2019 10:42:12 +0100
From:   Laura Abbott <labbott@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Jinbum Park <jinb.park7@...il.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 2/4] arm: dump: no need to check return value of
 debugfs_create functions

On 1/22/19 6:41 AM, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Jinbum Park <jinb.park7@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Laura Abbott <labbott@...hat.com>

Acked-by: Laura Abbott <labbott@...hat.com>

> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>   arch/arm/include/asm/ptdump.h | 9 +++------
>   arch/arm/mm/dump.c            | 4 ++--
>   arch/arm/mm/ptdump_debugfs.c  | 8 ++------
>   3 files changed, 7 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
> index 3ebf9718288d..0c2d3d0d4cc6 100644
> --- a/arch/arm/include/asm/ptdump.h
> +++ b/arch/arm/include/asm/ptdump.h
> @@ -21,13 +21,10 @@ struct ptdump_info {
>   
>   void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
>   #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
> -int ptdump_debugfs_register(struct ptdump_info *info, const char *name);
> +void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
>   #else
> -static inline int ptdump_debugfs_register(struct ptdump_info *info,
> -					const char *name)
> -{
> -	return 0;
> -}
> +static inline void ptdump_debugfs_register(struct ptdump_info *info,
> +					   const char *name) { }
>   #endif /* CONFIG_ARM_PTDUMP_DEBUGFS */
>   
>   void ptdump_check_wx(void);
> diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
> index 084779c5c893..eb385a500ed0 100644
> --- a/arch/arm/mm/dump.c
> +++ b/arch/arm/mm/dump.c
> @@ -450,7 +450,7 @@ void ptdump_check_wx(void)
>   static int ptdump_init(void)
>   {
>   	ptdump_initialize();
> -	return ptdump_debugfs_register(&kernel_ptdump_info,
> -					"kernel_page_tables");
> +	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
> +	return 0;
>   }
>   __initcall(ptdump_init);
> diff --git a/arch/arm/mm/ptdump_debugfs.c b/arch/arm/mm/ptdump_debugfs.c
> index be8d87be4b93..598b636615a2 100644
> --- a/arch/arm/mm/ptdump_debugfs.c
> +++ b/arch/arm/mm/ptdump_debugfs.c
> @@ -24,11 +24,7 @@ static const struct file_operations ptdump_fops = {
>   	.release	= single_release,
>   };
>   
> -int ptdump_debugfs_register(struct ptdump_info *info, const char *name)
> +void ptdump_debugfs_register(struct ptdump_info *info, const char *name)
>   {
> -	struct dentry *pe;
> -
> -	pe = debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
> -	return pe ? 0 : -ENOMEM;
> -
> +	debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
>   }
>