Re: megaraid_mbox: garbage in file

[Vasily Averin <vvs@sw.ru>]

James Bottomley wrote:
> On Fri, 2006-05-05 at 22:17 +0400, Vasily Averin wrote:
>> megaraid mailbox: status:0x0 cmd:0xa7 id:0x25 sec:0x1a
>>                 lba:0x33f624ac addr:0xffffffff ld:128 sg:4
>> scsi cmnd: 0x28 0x00 0x33 0xf6 0x24 0xac 0x00 0x00 0x1a 0x00
>> mbox request_buffer eafde340 use_sg 4
>> mbox sg0: page 077a0474 off 0 addr 1fd575000 len 4096 virt ff15a000
>>                 first 03020100 page->flags 40020101
>> mbox sg1: page 077b5738 off 0 addr 1fdede000 len 4096 virt ff141000
>>                 first 03020100 page->flags 40020101
>> mbox sg2: page 077ad500 off 0 addr 1fdb40000 len 4096 virt ff056000
>>                 first 03020100 page->flags 40020101
>> mbox sg3: page 030d46e8 off 1024 addr 5e6a400 len 1024 virt 07e6a400
>>                 first 03020100 page->flags 20001004
> 
> The odd thing about this is that the highmem addresses shouldn't have a
> virtual mapping (since nothing should have called kmap on them).

You are right, in the other my experiments highmem pages usually have virt=0 and
I cannot find who is kmapped these pages.

I'll investigate this issue later: first ща all I'll try to reproduce this issue
on 2.6.16 kernel.

Thank you,
	Vasily Averin

SWsoft Virtuozzo/OpenVZ Linux kernel team