From: Jack Steiner Date: Mon, 20 Jul 2009 14:28:41 +0000 (-0500) Subject: x86, UV: Complete IRQ interrupt migration in arch_enable_uv_irq() X-Git-Tag: v2.6.31-rc6~79^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2a5ef41661b56cf4eee042a6967c4e14b63e8eac;p=profile%2Fcommon%2Fkernel-common.git x86, UV: 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 LKML-Reference: <20090720142840.GA8885@sgi.com> Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 2284a48..d2ed6c5 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -3793,6 +3793,9 @@ int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade, 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; }