The main purpose of this patchset is to enable the MIPS CPU IRQ lines to be shared by the timer handler and performance counter handlers on MIPS r2+ cores, i.e. using IRQF_SHARED instead of having the timer handler directly call the perf counter handler.
This will allow the handling of local IRQs to scale to a 3rd IRQ for the fast debug channel (FDC), which would get pretty messy using calls between handlers as each interrupt can be arbitrarily routed to different or shared IRQ lines since MIPS r2. Pre-r2 IRQF_SHARED cannot be used as we aren't guaranteed to have individual local interrupt pending bits in CP0_Cause, so the interrupt conditions must be checked in the right order by the cevt-r4k handler. Patches 1-5 are minor refactors for stuff noticed along the way and shouldn't have any functional change by themselves. Patches 6-8 convert each of the timer and perf handlers to use compatible IRQ flags, and finally patch 9 makes the switch so that the interrupt line numbers may be the same on r2. Cc: Ralf Baechle <[email protected]> Cc: Andrew Bresticker <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jason Cooper <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Robert Richter <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: [email protected] James Hogan (9): MIPS: cevt-r4k: Move handle_perf_irq() out of header MIPS: Use CAUSEF_TI, CAUSEF_PCI constants MIPS: Remove redundant IPTI==IPPCI logic irqchip: mips-gic: Fix typo in comment irqchip: mips-gic: Add missing definitions for FDC IRQ MIPS: cevt-r4k: Make interrupt handler shared MIPS: perf: Allow sharing IRQ with timer MIPS: OProfile: Allow sharing IRQ with timer MIPS: Allow shared IRQ for timer & perf counter arch/mips/include/asm/cevt-r4k.h | 19 ------------------- arch/mips/kernel/cevt-r4k.c | 28 ++++++++++++++++++++++++++-- arch/mips/kernel/perf_event_mipsxx.c | 11 ++++++----- arch/mips/kernel/traps.c | 2 -- arch/mips/oprofile/op_model_mipsxx.c | 10 ++++++---- drivers/irqchip/irq-mips-gic.c | 2 +- include/linux/irqchip/mips-gic.h | 6 ++++++ 7 files changed, 45 insertions(+), 33 deletions(-) -- 2.0.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
