linux-kernel - Re: [PATCH 07/10] net: fix returning void-valued expression warnings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20080430.150832.107441339.davem@davemloft.net>
Date:	Wed, 30 Apr 2008 15:08:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	harvey.harrison@...il.com
Cc:	akpm@...ux-foundation.org, jeff@...zik.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] net: fix returning void-valued expression
 warnings

From: Harvey Harrison <harvey.harrison@...il.com>
Date: Wed, 30 Apr 2008 15:03:43 -0700

> drivers/net/8390.c:37:2: warning: returning void-valued expression
> drivers/net/bnx2.c:1635:3: warning: returning void-valued expression
> drivers/net/xen-netfront.c:1806:2: warning: returning void-valued expression
> net/ipv4/tcp_hybla.c:105:3: warning: returning void-valued expression
> net/ipv4/tcp_vegas.c:171:3: warning: returning void-valued expression
> net/ipv4/tcp_veno.c:123:3: warning: returning void-valued expression
> net/sysctl_net.c:85:2: warning: returning void-valued expression
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>

I wish this weren't marked with a warning, what spits this out,
sparse?

I know the kernel is written in C and not C++, but even Stroustrup
mentions this case explicitly in his book:

	 A void function cannot return a value.  However, a call of a
	 void function doesn't yield a value, so a void function can
	 use a call of a void function as the expression in a return
	 statement.

And I see no reason why there's anything wrong with this construct.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/