On Mon, Jun 29, 2009 at 04:31:18PM +0200, Jean Pihet wrote: > I am trying to get the latest IRQ registers from a timer or a work queue > but I am running into problems: > - get_irq_regs() returns NULL in some cases, It will always return NULL outside of IRQ context - and only returns valid pointers when used inside IRQ context. It's one of these things that nests itself - when you have several IRQs being processed on one CPU, there are several register contexts saved, and get_irq_regs() returns the most recent one. > The use case is that the performance unit (PMNC) of the Cortex A8 has some > serious bug, in short the performance counters overflow IRQ is to be avoided. I don't follow. None of the PMNC support code in the mainline kernel uses get_irq_regs() outside of IRQ context. > Some questions: > - is there a way to get the last 'real' IRQ registers from a timer or work > queue handler? No. Outside of IRQ events, the saved IRQ context does not exist. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
