Messages in this thread |  | | From | Christian Widmer <> | Subject | Re: stack overflow? | Date | Wed, 26 Sep 2001 15:46:26 +0200 |
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On Wednesday 26 September 2001 15:29, you wrote: > Christian Widmer wrote: > > hi > > > > i saw very strange behaviour when debuging my modules and i start to > > think about stack overflow. i know that the kernel stack of eache process > > is some what smaller than 8KB. but how big is the kernelstack during > > interrupt time when executing tasklets? > > Depends on the architecture, but on the x86 there is no stack switch > when you receive an interrupt in kernel mode. Thus, if too many > interrupts occur you could potentially overflow the stack. If > interrupted from user mode the stack switches to the top of the kernel > stack.
thanks i could verify that it was a stackoverflow. but this was due to an unexpected behaviour of gcc not because of too may interrupts :) i realiesd that when i had a look at the assemby output of my code. i had a macro that defined its local variables (256 byte). this macro was used n times and gcc allocates n * 256 bytes at the function entry point also it actualy only needs 256 byte. is his allocation strategy not silly?
chris
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