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| author | Jack Steiner <steiner@sgi.com> | 2009-07-20 09:28:41 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-04 16:32:52 +0200 |
| commit | 2a5ef41661b56cf4eee042a6967c4e14b63e8eac (patch) | |
| tree | 5ad0f39e6e3051428217b340854b6353d8cb3534 /arch/x86 | |
| parent | 6abf65510944d33b47575d151c6b318993c8d2b5 (diff) | |
| download | linux-stable-2a5ef41661b56cf4eee042a6967c4e14b63e8eac.tar.gz linux-stable-2a5ef41661b56cf4eee042a6967c4e14b63e8eac.tar.bz2 linux-stable-2a5ef41661b56cf4eee042a6967c4e14b63e8eac.zip | |
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@sgi.com>
LKML-Reference: <20090720142840.GA8885@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | 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 2284a4812b68..d2ed6c5ddc80 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; } |