On Wed, Aug 07, 2019 at 11:59:41AM +0100, Suzuki K Poulose wrote:
Hi Will,
On 07/08/2019 10:49, Will Deacon wrote:
Hi Sasha, [+Suzuki]
On Tue, Aug 06, 2019 at 05:29:04PM -0400, Sasha Levin wrote:
On Mon, Aug 05, 2019 at 06:13:06PM +0100, Will Deacon wrote:
These two patches are backports for 4.4.y stable kernels after one of
them failed to apply:
https://lkml.kernel.org/r/156498316752100@xxxxxxxxx
I took these 2, but note that they have two fixes that are not in 4.4:
314d53d297980 arm64: Handle mismatched cache type
4c4a39dd5fe2d arm64: Fix mismatched cache line size detection
Will you send a backport for them?
4.4 doesn't handle mismatches for the cache type or the line sizes, and
instead taints the kernel with a big splat at boot. If we wanted to
backport this, we'd need to pick up more than just the above patches, since
we don't have the means to emulate user cache maintenance operations either.
Given that the vast majority of systems don't suffer from this problem,
I'd be inclined not to try shoe-horning all of this into 4.4, where I think
it's more likely introduce other issues.
Suzuki, what do you think?
I agree. It involves a lot of new code, with non-trivial backports.
Okay, makes sense. Thanks for looking into it.
--
Thanks,
Sasha
