On 03/04/2020 04:59 PM, Qian Cai wrote: > > >> On Mar 4, 2020, at 1:49 AM, Christophe Leroy <christophe.leroy@xxxxxx> wrote: >> >> AFAIU, you are not taking an interrupt here. You are stuck in the pte_update(), most likely due to nested locks. Try with LOCKDEP ? > > Not exactly sure what did you mean here, but the kernel has all lockdep enabled and did not flag anything here. As the patch has been dropped from Linux next (next-20200304) perhaps in order to fold back the __pa_symbol() fix [1], so I am planning to respin the original patch once more as V15 while adding Qian's signed off by for the powerpc part. For now lets enable radix MMU ppc64 along with existing ppc32. As PPC_RADIX_MMU depends on PPC_BOOK3S_64, the following change should be good enough ? diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 497b7d0b2d7e..8d5ae14c5d4c 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -116,6 +116,7 @@ config PPC # select ARCH_32BIT_OFF_T if PPC32 select ARCH_HAS_DEBUG_VIRTUAL + select ARCH_HAS_DEBUG_VM_PGTABLE if (PPC_RADIX_MMU || PPC32) select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_FORTIFY_SOURCE [1] https://patchwork.kernel.org/patch/11407715/
