Messages in this thread | | | Date | Thu, 21 Jul 2016 16:05:56 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH] [4.7] arm64: Honor nosmp kernel command line option |
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On Thu, Jul 21, 2016 at 11:15:27AM +0100, Suzuki K. Poulose wrote: > Passing "nosmp" should boot the kernel with a single processor, without > provision to enable secondary CPUs even if they are present. "nosmp" is > implemented by setting maxcpus=0. At the moment we still mark the secondary > CPUs present even with nosmp, which allows the userspace to bring them > up. This patch corrects the smp_prepare_cpus() to honor the maxcpus == 0. > > Commit 44dbcc93ab67145 ("arm64: Fix behavior of maxcpus=N") fixed the > behavior for maxcpus >= 1, but broke maxcpus = 0. > > Fixes: commit 44dbcc93ab67145 ("arm64: Fix behavior of maxcpus=N") > Cc: Will Deacon <will.deacon@arm.com> > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: James Morse <james.morse@arm.com> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Queued for 4.8, with Mark's comment and a cc stable for 4.7
-- Catalin
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