[uClinux-dev] soft_irq()

John Williams jwilliams at itee.uq.edu.au
Mon Mar 24 01:11:24 EST 2003

Hi folks,

Can anyone give me the "25 words or less" on the kernel soft_irq 
mechanism?  There's precisely zero mention of it in "Understanding the 
linux kernel", and I think it's what's giving me grief in my early 
startup (immediately after sti()).

In handle_irq(), after actually dispatching the handler->action() and 
all that, the last thing that happens before returning into entry.S to 
clean up the IRQ saved state is the following


For some reason my kernel is taking this branch, even though the only 
interrupt enabled is the timer, and I can't see anything it does that 
could cause softirq_pending() to be true.

Can anyone offer any helpful words?



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