On Sep 3, 2012, at 3:33 PM, Mindaugas Rasiukevicius wrote:
> "Matt Thomas" wrote:
>> Module Name: src
>> Committed By:matt
>> Date:Mon Sep 3 19:53:43 UTC 2012
>>
>> Modified Files:
>> src/sys/uvm: uvm_km.c uvm_map.c
>>
>> Log Message:
>> Switch to a spin lock (uvm_kentry_lock) which, fortunately, was sitting
>> there unused.
>
> - pmap_growkernel() may use adaptive locks, which cannot be acquired with
> the spin lock held; so the change breaks at least x86 and alpha.
>
> - Why in the caller? I think it would be better do leave it for the pmaps,
> e.g. they may re-use the locks which already provide the necessary
> protection and which need to be taken anyway (like in x86 pmap).
uvm_maxkaddr need a lock for its updating
growkernel can be called uvm_km_mem_alloc which might be called
at interrupt level.
