linux-kernel - Re: [PATCH 06/11] rwsem: wake queued readers when writer blocks on active read lock

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Message-ID: <AANLkTiky4AvhTjt62Uw-VDCGg_wykzVkScYWxrHkhhgJ@mail.gmail.com>
Date:	Thu, 12 Aug 2010 09:22:09 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Waychison <mikew@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 06/11] rwsem: wake queued readers when writer blocks on
 active read lock

On Wed, Aug 11, 2010 at 10:02 PM, Michel Lespinasse <walken@...gle.com> wrote:
> #define RWSEM_UNLOCKED_VALUE __IA64_UL_CONST(0x0000000000000000)
> #define RWSEM_ACTIVE_BIAS (1L)
> #define RWSEM_ACTIVE_MASK (0xffffffffL)
> #define RWSEM_WAITING_BIAS (-0x100000000L)
> #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
> #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)

Thanks - that fixes it for me.

-Tony
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