On Sat, Jan 09, 2021 at 12:58:05AM +0100, Thomas Bogendoerfer wrote: > On Fri, Jan 08, 2021 at 08:20:43PM +0000, Paul Cercueil wrote: > > Hi Thomas, > > > > 5.11 does not boot anymore on Ingenic SoCs, I bisected it to this commit. > > > > Any idea what could be happening? > > not yet, kernel crash log of a Malta QEMU is below. update: This dirty hack lets the Malta QEMU boot again: diff --git a/mm/highmem.c b/mm/highmem.c index c3a9ea7875ef..190cdda1149d 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -515,7 +515,7 @@ void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot) vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); BUG_ON(!pte_none(*(kmap_pte - idx))); pteval = pfn_pte(pfn, prot); - set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval); + set_pte(kmap_pte - idx, pteval); arch_kmap_local_post_map(vaddr, pteval); current->kmap_ctrl.pteval[kmap_local_idx()] = pteval; preempt_enable(); set_pte_at() tries to update cache and could do an kmap_atomic() there. Not sure, if this is allowed at this point. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
