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Message-ID: <AANLkTim3thKSwTHSQ7UXir+1cT9cfFaEjTFGGMdz0_Bt@mail.gmail.com>
Date: Wed, 11 Aug 2010 22:09:34 -0700
From: Michel Lespinasse <walken@...gle.com>
To: Tony Luck <tony.luck@...el.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:
> In arch/ia64/include/asm/rwsem.h I see RWSEM_WAITING_BIAS defined as
> -__IA64_UL_CONST(0x0000000100000000)
>
> This makes it a large, positive unsigned value. This is probably
> throwing off the rwsem_atomic_update(0, sem) < RWSEM_WAITING_BIAS
> comparison in my patch (supposed to be long versus long, but actually
> is long versus unsigned long on ia64).
FYI, I just verified that RWSEM_WAITING_BIAS is defined as signed on
all architectures except for ia64. So, this would be consistent with
the issue being observed only on ia64.
--
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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