[PATCH 03/19] arm64: Run ARCH_WORKAROUND_2 enabling code on all CPUs

[Suzuki K Poulose]

On 09/18/2020 05:47 PM, Will Deacon wrote:
> From: Marc Zyngier <maz at kernel.org>
> 
> Commit 606f8e7b27bf ("arm64: capabilities: Use linear array for
> detection and verification") changed the way we deal with per-CPU errata
> by only calling the .matches() callback until one CPU is found to be
> affected. At this point, .matches() stop being called, and .cpu_enable()
> will be called on all CPUs.
> 
> This breaks the ARCH_WORKAROUND_2 handling, as only a single CPU will be
> mitigated.
> 
> In order to address this, forcefully call the .matches() callback from a
> .cpu_enable() callback, which brings us back to the original behaviour.
> 
> Fixes: 606f8e7b27bf ("arm64: capabilities: Use linear array for detection and verification")
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> Signed-off-by: Will Deacon <will at kernel.org>

Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>