linux-kernel - Re: [PATCH 1/4] uml: cow_user.c warning corrections

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Message-Id: <201107051128.25262.richard@nod.at>
Date:	Tue, 5 Jul 2011 11:28:24 +0200
From:	Richard Weinberger <richard@....at>
To:	vitalivanov@...il.com
Cc:	Jeff Dike <jdike@...toit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	user-mode-linux-devel@...ts.sourceforge.net,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] uml: cow_user.c warning corrections

Am Dienstag 05 Juli 2011, 01:15:41 schrieb Vitaliy Ivanov:
> From 6201d3e862fca8670b206338dc90303ea0acc77d Mon Sep 17 00:00:00 2001
> From: Vitaliy Ivanov <vitalivanov@...il.com>
> Date: Tue, 5 Jul 2011 01:57:51 +0300
> Subject: [PATCH 1/4] uml: cow_user.c warning corrections
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> arch/um/drivers/cow_user.c: In function ‘absolutize’:
> arch/um/drivers/cow_user.c:189:7: warning: ignoring return value of
> ‘chdir’, declared with attribute warn_unused_result

What compiler flags are you using?
Using the default settings this warning does not show up.
Most of the "ignoring return value" are totally useless.

> Signed-off-by: Vitaliy Ivanov <vitalivanov@...il.com>
> ---
>  arch/um/drivers/cow_user.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
> index 93f227a..9cbb426 100644
> --- a/arch/um/drivers/cow_user.c
> +++ b/arch/um/drivers/cow_user.c
> @@ -186,7 +186,11 @@ static int absolutize(char *to, int size, char *from)
>  		strcat(to, "/");
>  		strcat(to, from);
>  	}
> -	chdir(save_cwd);
> +	if (chdir(save_cwd)) {
> +		cow_printf("absolutize : Can't cd to '%s' - "
> +			   "errno = %d\n", save_cwd, errno);
> +		return -1;
> +	}

I don't think that this check is needed nor chdir() to save_cwd can fail.
Because we obtain it by calling getcwd() and never change it...

Thanks,
//richard
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