> Recent CMA change "cma: make number of CMA areas dynamic, remove > CONFIG_CMA_AREAS" breaks the boot of arm64 kernel in linux-next. > Knic is like: > > Unable to handle kernel paging request at virtual address ffff0000438fff70 > Mem abort info: > ESR = 0x96000044 > EC = 0x25: DABT (current EL), IL = 32 bits > SET = 0, FnV = 0 > EA = 0, S1PTW = 0 > Data abort info: > ISV = 0, ISS = 0x00000044 > CM = 0, WnR = 1 > swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000041f61000 > [ffff0000438fff70] pgd=0000000000000000, p4d=0000000000000000 > Internal error: Oops: 96000044 [#1] PREEMPT SMP > Modules linked in: > CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-rc3-00020-ge1bce3d64c48 #2 > Hardware name: linux,dummy-virt (DT) > pstate: 20000085 (nzCv daIf -PAN -UAO BTYPE=--) > pc : __memset+0x148/0x188 > lr : memblock_alloc_try_nid+0xbc/0xd4 > sp : ffff800011ab3d10 > x29: ffff800011ab3d10 x28: 0000000041710018 > x27: 0000000040000000 x26: ffff8000115d1000 > x25: 0000000000000000 x24: ffff800011300428 > x23: ffff800011d1bd60 x22: 0000000000000000 > x21: 00000000ffffffff x20: ffff0000438fff70 > x19: 0000000000000090 x18: 0000000000000010 > x17: 0000000000001400 x16: 0000000000001c00 > x15: ffff800011ac3530 x14: ffff800011ac3530 > x13: fffffdfffe600000 x12: ffff800011ab3e44 > x11: 0000000000000004 x10: 0000000000000018 > x9 : 0000000000000000 x8 : ffff0000438fff70 > x7 : 0000000000000000 x6 : 000000000000003f > x5 : 0000000000000040 x4 : 0000000000000010 > x3 : 0000000000000080 x2 : 0000000000000080 > x1 : 0000000000000000 x0 : ffff0000438fff70 > Call trace: > __memset+0x148/0x188 > cma_init_reserved_mem+0x94/0x154 > cma_declare_contiguous_nid+0x240/0x2bc > dma_contiguous_reserve_area+0x48/0x78 > dma_contiguous_reserve+0x78/0x88 > arm64_memblock_init+0x424/0x45c > setup_arch+0x270/0x5f0 > start_kernel+0x84/0x4dc > Code: f101007f fa45a068 54fffc0b aa0303e2 (a9001d07) > random: get_random_bytes called from print_oops_end_marker+0x2c/0x68 with crng_init=0 > ---[ end trace 0000000000000000 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- > > The virtual address returned from memblock_alloc() is not ready till > paging_init() is done. > > Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx> > Cc: Roman Gushchin <guro@xxxxxx> > Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Will Deacon <will@xxxxxxxxxx> > Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Tested-by: Anders Roxell <anders.roxell@xxxxxxxxxx> Cheers, Anders
