| commit | 0b390e2126e03b6ec41f96fb0550b1526d00e203 | |
| author | Will Deacon <will.deacon@arm.com> | |
| Wed, 27 Jul 2011 14:18:59 +0000 (27 15:18 +0100) | ||
| committer | Will Deacon <will.deacon@arm.com> | |
| Wed, 31 Aug 2011 09:17:59 +0000 (31 10:17 +0100) | ||
| tree | 36520568e01918ab82900631c75960016ffe464c | treesnapshot (tar.gz zip) |
| parent | b0e89590f4f27ea5ff30bdedb9a58ea904a6b353 | commitdiff |
ARM: perf: use cpumask_t to record active IRQs
Commit 5dfc54e0 ("ARM: GIC: avoid routing interrupts to offline CPUs")
prevents the GIC from setting the affinity of an IRQ to a CPU with
id >= nr_cpu_ids. This was previously abused by perf on some platforms
where more IRQs were registered than possible CPUs.
This patch fixes the problem by using a cpumask_t to keep track of the
active (requested) interrupts in perf. The same effect could be achieved
by limiting the number of IRQs to the number of CPUs, but using a mask
instead will be useful for adding extended CPU hotplug support in the
future.
Acked-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Commit 5dfc54e0 ("ARM: GIC: avoid routing interrupts to offline CPUs")
prevents the GIC from setting the affinity of an IRQ to a CPU with
id >= nr_cpu_ids. This was previously abused by perf on some platforms
where more IRQs were registered than possible CPUs.
This patch fixes the problem by using a cpumask_t to keep track of the
active (requested) interrupts in perf. The same effect could be achieved
by limiting the number of IRQs to the number of CPUs, but using a mask
instead will be useful for adding extended CPU hotplug support in the
future.
Acked-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| arch/arm/kernel/perf_event.c | diffblobblamehistory |