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Date: Mon, 20 Jul 2009 09:28:41 -0500 From: Jack Steiner <steiner@....com> To: mingo@...e.hu, tglx@...utronix.de Cc: linux-kernel@...r.kernel.org Subject: [PATCH] - Complete IRQ interrupt migration in arch_enable_uv_irq() In uv_setup_irq(), the call to create_irq() initially assigns IRQ vectors to cpu 0. The subsequent call to assign_irq_vector() in arch_enable_uv_irq() migrates the IRQ to another cpu and frees the cpu 0 vector - at least it will be freed as soon as the "IRQ move" completes. arch_enable_uv_irq() needs to send a cleanup IPI to complete the IRQ move. Otherwise, assignment of GRU interrupts on large systems (>200 cpus) will exhaust the cpu 0 interrupt vectors and initialization of the GRU driver will fail. Signed-off-by: Jack Steiner <steiner@....com> --- arch/x86/kernel/apic/io_apic.c | 3 +++ 1 file changed, 3 insertions(+) Index: linux/arch/x86/kernel/apic/io_apic.c =================================================================== --- linux.orig/arch/x86/kernel/apic/io_apic.c 2009-07-20 07:55:46.000000000 -0500 +++ linux/arch/x86/kernel/apic/io_apic.c 2009-07-20 07:56:33.000000000 -0500 @@ -3737,6 +3737,9 @@ int arch_enable_uv_irq(char *irq_name, u mmr_pnode = uv_blade_to_pnode(mmr_blade); uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value); + if (cfg->move_in_progress) + send_cleanup_vector(cfg); + return irq; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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