linux-kernel - Re: [DOC PATCH] Remove mention of semaphores from kernel-locking

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Message-Id: <200804220215.30855.rusty@rustcorp.com.au>
Date:	Tue, 22 Apr 2008 02:15:30 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [DOC PATCH] Remove mention of semaphores from kernel-locking

On Tuesday 22 April 2008 00:52:30 Matthew Wilcox wrote:
> Since the consensus seems to be to eliminate semaphores where possible,
> we shouldn't be educating people about how to use them as locks.

Agreed.

> Use 
> mutexes instead.  Semaphores should be described in a separate document
> if we end up keeping them.
>
> Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
>
> (I'll put this patch in the semaphore git tree tomorrow unless I hear
> complaints.)
>
> diff --git a/Documentation/DocBook/kernel-locking.tmpl
> b/Documentation/DocBook/kernel-locking.tmpl index 435413c..e1f4655 100644
> --- a/Documentation/DocBook/kernel-locking.tmpl
> +++ b/Documentation/DocBook/kernel-locking.tmpl
> @@ -222,7 +222,7 @@
>     <title>Three Main Types of Kernel Locks: Spinlocks, Mutexes and
> Semaphores</title>
>
>     <para>
> -     There are three main types of kernel locks.  The fundamental type
> +     There are two main types of kernel locks.  The fundamental type
>       is the spinlock
>       (<filename class="headerfile">include/asm/spinlock.h</filename>),
>       which is a very simple single-holder lock: if you can't get the

Fix title, too?

Thanks for the other fixes too; this document needs some love,

Acked,
Rusty.
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