On Wed, May 26, 2021 at 08:47:16PM +0100, Jon Hunter wrote: > On 11/05/2021 19:23, Catalin Marinas wrote: > > 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@xxxxxxx> > > Cc: Will Deacon <will@xxxxxxxxxx> > > Cc: Mark Rutland <mark.rutland@xxxxxxx> > > Cc: Suzuki K Poulose <Suzuki.Poulose@xxxxxxx> [...] > 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@xxxxxxx Will should have dropped the old one from linux-next but it takes a few hours before Stephen re-creates the tree. -- Catalin
