[PATCHv2 3/4] arm64: cachetype: report weakest cache policy

Will Deacon will.deacon at arm.com
Wed Jun 18 10:18:38 PDT 2014

On Tue, Jun 17, 2014 at 06:04:33PM +0100, Mark Rutland wrote:
> In big.LITTLE systems, the I-cache policy may differ across CPUs, and
> thus we must always meet the most stringent maintenance requirements of
> any I-cache in the system when performing maintenance to ensure
> correctness. Unfortunately this requirement is not met as we always look
> at the current CPU's cache type register to determine the maintenance
> requirements.
> This patch causes the I-cache policy of all CPUs to be taken into
> account for icache_is_aliasing and icache_is_aivivt. If any I-cache in
> the system is aliasing or AIVIVT, the respective function will return
> true. At boot each CPU may set flags to identify that at least one
> I-cache in the system is aliasing and/or AIVIVT.
> The now unused and potentially misleading icache_policy function is
> removed.

Ah, ok, you're growing cpuinfo.c. Ignore my earlier comment about deleting
the header then :)


More information about the linux-arm-kernel mailing list