On Wed, 11 May 2016 16:47:11 +1000 Michael Ellerman <m...@ellerman.id.au> wrote:
> Currently a kernel that is built with CONFIG_PPC_RADIX_MMU=n, and then > booted on a 64-bit Hash MMU system will crash on the first SLB miss, > typically with an oops something like: > > Unrecoverable exception 4100 at c000000000969504 > cpu 0x0: Vector: 4100 at [c000000000de78e0] > pc: c000000000969504: memmap_init_zone+0x160/0x2dc > lr: c0000000009694b0: memmap_init_zone+0x10c/0x2dc > ... > [c000000000de7b60] c000000000968ec8 init_currently_empty_zone+0x3c/0x11c > (unreliable) > [c000000000de7bf0] c000000000969bc0 free_area_init_node+0x540/0x688 > [c000000000de7cf0] c000000000c4b3b4 free_area_init_nodes+0x7b4/0x864 > [c000000000de7df0] c000000000c2fce0 paging_init+0x88/0xa4 > [c000000000de7e60] c000000000c2b49c setup_arch+0x29c/0x2ec > [c000000000de7f00] c000000000c23b7c start_kernel+0x88/0x524 > [c000000000de7f90] c000000000008c60 start_here_common+0x20/0xa0 > > This is caused by the branch in slb_miss_realmode() that jumps directly > to the unrecoverable case when MMU_FTR_RADIX is set: > > BEGIN_MMU_FTR_SECTION > b 2f > END_MMU_FTR_SECTION_IFSET(MMU_FTR_RADIX) > This makes sense and its a good way to avoid plenty of #ifdefs around code Acked-by: Balbir Singh <bsinghar...@gmail.com> Balbir Singh _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
