[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-alpha
Subject:    Re: [BUG] (alpha) kernel thread panics due to stale PTBR settings in
From:       Manfred Spraul <manfreds () colorfullife ! com>
Date:       2000-02-25 22:53:59
[Download RAW message or body]

Dave Anderson wrote:
> 
>   If this is still a work in progress, excuse my interruption, but if
> not,
>   the alpha enter_lazy_tlb() should update the kernel task's ptbr with
> the
>   oldmm's pgd.  Right?

I added enter_lazy_tlb() for i386 [I needed it for the new lazy tlb
flush code], and I added empty functions for all other architectures.

Note that Richard Henderson found another problem with the current alpha
tlb code design:
Richard Henderson wrote on 06 Feb 2000:
> But this leads to a different failing scenario:
> 
>         CPU0:                           CPU1:
>         switch_mm(A,mmA)
>           this implies A->thread.asn
>           and mmA->context are valid.
>                                         flush_tlb_other(A)
>                                           this implies mmA->context is 0.
>         switch_to(A)
>           Now A->thread.asn is out of
>           sync with mmA->context.
> 
> This will require some thought to avoid scrogging schedule entirely.
>


--
	Manfred

[prev in list] [next in list] [prev in thread] [next in thread]