linux-kernel - Re: [PATCH 03/11] vfs: Don't allow overwriting mounts in the current mount namespace

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Message-ID: <CA+55aFx8nksLjQt3aECVk2Ni5FNPXxL988mEqfFgqbbubZho6w@mail.gmail.com>
Date:	Tue, 18 Feb 2014 14:20:29 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Rob Landley <rob@...dley.net>,
	Christoph Hellwig <hch@...radead.org>,
	Karel Zak <kzak@...hat.com>,
	"J. Bruce Fields" <bfields@...ldses.org>
Subject: Re: [PATCH 03/11] vfs: Don't allow overwriting mounts in the current
 mount namespace

On Tue, Feb 18, 2014 at 1:28 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
>>
>> Minor nit: return value of any is_* function is either true or false, so why not
>> declare it bool?
>
> Because I am working on the core of the kernel and C compilers do weird
> things with bool variables (storing them in bytes...).  I expected a
> type that the C compiler does not do weird things with would be more
> readily received on a path whose performance people are interested in.

Yeah, I have to say that I'm not a huge fan of "bool". It has some odd
properties, especially in memory (ie as a structure member).

For this kind of function return value it actually tends to work very
well, and in fact often generates slightly better code than "int". So
I don't _hate_ bool, and we've certainly had a lot more use creep in
lately, but I also don't really see "bool" as much of an upside.

             Linus
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