linux-kernel - Re: [PATCH] um: use RWSEM_GENERIC

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Message-ID: <BANLkTikh0R7EBaG1q4GQz1Te5jmWtA42GQ@mail.gmail.com>
Date:	Mon, 23 May 2011 13:46:30 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Richard Weinberger <richard@....at>
Cc:	akpm@...ux-foundation.org,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"# .39.x" <stable@...nel.org>
Subject: Re: [PATCH] um: use RWSEM_GENERIC_SPINLOCK on x86

On Mon, May 23, 2011 at 1:30 PM, Richard Weinberger <richard@....at> wrote:
>
>  config RWSEM_XCHGADD_ALGORITHM
> -       def_bool X86_XADD
> +       def_bool X86_XADD && 64BIT
>
>  config RWSEM_GENERIC_SPINLOCK
> -       def_bool !X86_XADD
> +       def_bool !X86_XADD || !64BIT

May I suggest just changing that second one to

  config RWSEM_GENERIC_SPINLOCK
      def_bool !RWSEM_XCHGADD_ALGORITHM

because I had to look twice just to make sure that they are inverses
of each other.

So why not make that inverse relationship more obvious?

                         Linus
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