RE: kmalloc within IRQ lock

["Prokopenko, Konstantyn" <kproko@xxxxxxxxxxxx>]

Hi all,

Well, in theory you can generate dead-lock cituation. kmalloc with
GFP_KERNEL flag in low memory condition
can put "current" user to sleep waiting for swap daemon to free pages. I
think I don't need to explain further what could happen if you have IRQ lock
around it.... It looks like a time bomb :)..

Regards,
Konstantyn

-----Original Message-----
From: Guillaume Thouvenin [mailto:guillaume.thouvenin@xxxxxxxxxx]
Sent: Thursday, May 06, 2004 9:07 AM
To: Kernel Newbies
Subject: kmalloc within IRQ lock


Hello,

 I don't see a scenario where doing a kmalloc inside an IRQ lock could
generate
a deadlock. Can someone give me one? 

 Where can you safely use kmalloc? everywhere outside a lock?

Thanks for your help
Guillaume

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