Commit-ID: 2a5ef41661b56cf4eee042a6967c4e14b63e8eac Gitweb: http://git.kernel.org/tip/2a5ef41661b56cf4eee042a6967c4e14b63e8eac Author: Jack Steiner <steiner@xxxxxxx> AuthorDate: Mon, 20 Jul 2009 09:28:41 -0500 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Tue, 4 Aug 2009 16:32:52 +0200 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 <steiner@xxxxxxx> LKML-Reference: <20090720142840.GA8885@xxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/kernel/apic/io_apic.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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