On 26/05/2021 22:48, Catalin Marinas wrote:

On Wed, May 26, 2021 at 08:47:16PM +0100, Jon Hunter wrote:

quoted

On 11/05/2021 19:23, Catalin Marinas wrote:

quoted

The GMID_EL1.BS field determines the number of tags accessed by the
LDGM/STGM instructions (EL1 and up), used by the kernel for copying or
zeroing page tags.

Taint the kernel if GMID_EL1.BS differs between CPUs.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>

[...]

quoted

I am seeing the following undefined instruction crash on all our 
ARM64 Tegra devices on today's -next and bisect is pointing to
this patch. Reverting this patch on top of -next does fix the 
problem. Let me know if you have any thoughts.

Yeah, sorry about that. Posted a new version here, better tested:

https://lore.kernel.org/r/20210526193621.21559-1-catalin.marinas@arm.com (local)

Will should have dropped the old one from linux-next but it takes a few
hours before Stephen re-creates the tree.

No problem. Thanks for the quick fix!

Jon

-- 
nvpublic

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