Messages in this thread | | | Date | Thu, 19 Jul 2018 12:16:41 +0100 | From | Russell King - ARM Linux <> | Subject | Re: arm: v4.18-rc5 with cpuidle on TC2 (A7 boot) spectre v2 issue |
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On Thu, Jul 19, 2018 at 11:39:19AM +0100, Morten Rasmussen wrote: > On Thu, Jul 19, 2018 at 11:01:10AM +0100, Russell King - ARM Linux wrote: > > On Thu, Jul 19, 2018 at 11:42:50AM +0200, Dietmar Eggemann wrote: > > > Hi, > > > > > > running v4.18-rc5 (plus still missing "power: vexpress: fix corruption in > > > notifier registration", otherwise I get this rcu_sched stall issue) on TC2 > > > (A7 boot) with vanilla multi_v7_defconfig plus > > > CONFIG_ARM_BIG_LITTLE_CPUIDLE=y gives me continuous: > > > > > > ... > > > CPUX: Spectre v2: incorrect context switching function, system vulnerable > > > ... > > > > > > messages. > > > > > > Work around is to disable CONFIG_HARDEN_BRANCH_PREDICTOR. > > > > or disable big.Little if you want the hardening. > > > > The choices are currently either protection against Spectre or big.Little > > support since the two are mutually exclusive at the moment. > > Would it be possible to make those message only appear once like they do > when booting on A15?
Yes, it's possible. Feel free to send a patch, thanks.
-- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 13.8Mbps down 630kbps up According to speedtest.net: 13Mbps down 490kbps up
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