linux-kernel - Re: tasks getting stuck on mmap

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Date:	Tue, 17 Aug 2010 14:59:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	walken@...gle.com
Cc:	torvalds@...ux-foundation.org, tony.luck@...el.com,
	dhowells@...hat.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?

From: Michel Lespinasse <walken@...gle.com>
Date: Tue, 17 Aug 2010 14:47:05 -0700

> On Tue, Aug 17, 2010 at 2:28 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> Oh, and it strikes me when looking at the sparc rwsem-const.h that it
>> has some unsigned constants in it. I think
>>
>>  #define RWSEM_WAITING_BIAS              0xffff0000
>>
>> is actually unsigned, because it's a hex constant that doesn't fit in
>> a signed int. So it's of type 'unsigned int' if I recall the C type
>> rules right.
> 
> Eeeek, this totally escaped me when I had a quick look at constant
> signed-ness across architectures. This is definitely a problem.
> 
>> #define RWSEM_WAITING_BIAS             (-0x00010000)
> 
> David, do you still see failures with v2.6.36-rc1 plus that one line fix ?

As I said in a reply to Tony I don't even think your commit is
to blame, because even after reverting it I still have the
problems.

I'll keep digging into this.
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