svn commit: r211176 - in head/sys: amd64/amd64 i386/i386

Attilio Rao attilio at
Wed Aug 11 17:25:48 UTC 2010

2010/8/11 John Baldwin <jhb at>:
> Attilio Rao wrote:
>> Author: attilio
>> Date: Wed Aug 11 10:51:27 2010
>> New Revision: 211176
>> URL:
>> Log:
>>  IPI handlers may run generally with interrupts disabled because they
>>  are served via an interrupt gate.
>>    However, that doesn't explicitly prevent preemption and thread
>>  migration thus scheduler pinning may be necessary in some handlers.
>>  Fix that.
>>    Tested by:  gianni
>>  MFC after:    1 month
> Actually that does prevent preemption if you do not call any code that would
> schedule a thread.  I think this change is all safe to revert.

Do you recall, then, why lapic_handle_timer() does critical section?
It seems to be catered by interrupt gate as well, and I don't see any
point re-enabling them explicitly.


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