Re: tasks getting stuck on mmap_sem?

[David Miller]

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

> On Tue, Aug 17, 2010 at 2:28 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> 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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