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H A D | irq-omap-intc.c | 6ed34648 Fri Jan 02 16:18:54 CST 2015 Felipe Balbi <balbi@ti.com> irqchip: omap-intc: Improve IRQ handler
As it turns out the current IRQ number will *always* be available from SIR register which renders the reads of PENDING registers as plain unnecessary overhead.
In order to catch any situation where SIR reads as zero, we're adding a WARN() to turn it into a very verbose error and users actually report it.
With this patch average running time of omap_intc_handle_irq() reduced from about 28.5us to 19.8us as measured by the kernel function profiler.
Tested with BeagleBoneBlack Rev A5C.
Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Cc: Linux ARM Kernel Mailing List <linux-arm-kernel@lists.infradead.org> Link: http://lkml.kernel.org/r/20150720204910.GH5394@saruman.tx.rr.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 6ed34648 Fri Jan 02 16:18:54 CST 2015 Felipe Balbi <balbi@ti.com> irqchip: omap-intc: Improve IRQ handler As it turns out the current IRQ number will *always* be available from SIR register which renders the reads of PENDING registers as plain unnecessary overhead. In order to catch any situation where SIR reads as zero, we're adding a WARN() to turn it into a very verbose error and users actually report it. With this patch average running time of omap_intc_handle_irq() reduced from about 28.5us to 19.8us as measured by the kernel function profiler. Tested with BeagleBoneBlack Rev A5C. Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Cc: Linux ARM Kernel Mailing List <linux-arm-kernel@lists.infradead.org> Link: http://lkml.kernel.org/r/20150720204910.GH5394@saruman.tx.rr.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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