linux-kernel - Re: tasks getting stuck on mmap

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Message-ID: <AANLkTimLqc02xNun0QR5ZgP497mm8ZC5ZfpCUx2AGz4Y@mail.gmail.com>
Date:	Tue, 17 Aug 2010 14:47:05 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tony Luck <tony.luck@...el.com>,
	David Miller <davem@...emloft.net>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: tasks getting stuck on mmap_sem?

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 ?

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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