Messages in this thread Patch in this message | | | From | Max Krasnyansky <> | Subject | [PATCH sched-devel 2/7] cpuisol: Do not route IRQs to the CPUs isolated at boot | Date | Fri, 22 Feb 2008 13:09:13 -0800 |
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Most people would expect isolated CPUs to not get any IRQs by default. This happens naturally if a CPU is brought off-line, marked isolated and then brought back online.
There was some confusion about this patch originaly. So I wanted to clarify that it does not completely disable IRQ handling on the isolated CPUs. Users still have the option or routing IRQs to them by modifying IRQ affinity mask.
I cannot test other archs hence the patch is for x86_64 only.
Signed-off-by: Max Krasnyansky <maxk@qualcomm.com> --- arch/x86/kernel/genapic_flat_64.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/genapic_flat_64.c b/arch/x86/kernel/genapic_flat_64.c index 07352b7..e02e58c 100644 --- a/arch/x86/kernel/genapic_flat_64.c +++ b/arch/x86/kernel/genapic_flat_64.c @@ -21,7 +21,9 @@ static cpumask_t flat_target_cpus(void) { - return cpu_online_map; + cpumask_t target; + cpus_andnot(target, cpu_online_map, cpu_isolated_map); + return target; } static cpumask_t flat_vector_allocation_domain(int cpu) -- 1.5.4.1
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