Hello Miles, On Tue, May 18, 2021 at 05:24:44PM +0800, Miles Chen wrote: > This patches is created to fix the __pa() warning messages when > CONFIG_DEBUG_VIRTUAL=y by unifying the allocation of pglist_data > instances. > > In current implementation of node_data, if CONFIG_NEED_MULTIPLE_NODES=y, > pglist_data is allocated by a memblock API. If CONFIG_NEED_MULTIPLE_NODES=n, > we use a global variable named "contig_page_data". > > If CONFIG_DEBUG_VIRTUAL is not enabled. __pa() can handle both > allocation and symbol cases. But if CONFIG_DEBUG_VIRTUAL is set, > we will have the "virt_to_phys used for non-linear address" warning > when booting. > > To fix the warning, always allocate pglist_data by memblock APIs and > remove the usage of contig_page_data. Somehow I was sure that we can allocate pglist_data before it is accessed in sparse_init() somewhere outside mm/sparse.c. It's really not the case and having two places that may allocated this structure is surely worth than your previous suggestion. Sorry about that. > Warning message: > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] virt_to_phys used for non-linear address: (____ptrval____) (contig_page_data+0x0/0x1c00) > [ 0.000000] WARNING: CPU: 0 PID: 0 at arch/arm64/mm/physaddr.c:15 __virt_to_phys+0x58/0x68 > [ 0.000000] Modules linked in: > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G W 5.13.0-rc1-00074-g1140ab592e2e #3 > [ 0.000000] Hardware name: linux,dummy-virt (DT) > [ 0.000000] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO BTYPE=--) > [ 0.000000] pc : __virt_to_phys+0x58/0x68 > [ 0.000000] lr : __virt_to_phys+0x54/0x68 > [ 0.000000] sp : ffff800011833e70 > [ 0.000000] x29: ffff800011833e70 x28: 00000000418a0018 x27: 0000000000000000 > [ 0.000000] x26: 000000000000000a x25: ffff800011b70000 x24: ffff800011b70000 > [ 0.000000] x23: fffffc0001c00000 x22: ffff800011b70000 x21: 0000000047ffffb0 > [ 0.000000] x20: 0000000000000008 x19: ffff800011b082c0 x18: ffffffffffffffff > [ 0.000000] x17: 0000000000000000 x16: ffff800011833bf9 x15: 0000000000000004 > [ 0.000000] x14: 0000000000000fff x13: ffff80001186a548 x12: 0000000000000000 > [ 0.000000] x11: 0000000000000000 x10: 00000000ffffffff x9 : 0000000000000000 > [ 0.000000] x8 : ffff8000115c9000 x7 : 737520737968705f x6 : ffff800011b62ef8 > [ 0.000000] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 > [ 0.000000] x2 : 0000000000000000 x1 : ffff80001159585e x0 : 0000000000000058 > [ 0.000000] Call trace: > [ 0.000000] __virt_to_phys+0x58/0x68 > [ 0.000000] check_usemap_section_nr+0x50/0xfc > [ 0.000000] sparse_init_nid+0x1ac/0x28c > [ 0.000000] sparse_init+0x1c4/0x1e0 > [ 0.000000] bootmem_init+0x60/0x90 > [ 0.000000] setup_arch+0x184/0x1f0 > [ 0.000000] start_kernel+0x78/0x488 > [ 0.000000] ---[ end trace f68728a0d3053b60 ]--- > > [1] https://lore.kernel.org/patchwork/patch/1425110/ > > Change since v1: > - use memblock_alloc() to create pglist_data when CONFIG_NUMA=n > > Miles Chen (2): > mm: introduce prepare_node_data > mm: replace contig_page_data with node_data > > Documentation/admin-guide/kdump/vmcoreinfo.rst | 13 ------------- > arch/powerpc/kexec/core.c | 5 ----- > include/linux/gfp.h | 3 --- > include/linux/mm.h | 2 ++ > include/linux/mmzone.h | 4 ++-- > kernel/crash_core.c | 1 - > mm/memblock.c | 3 +-- > mm/page_alloc.c | 16 ++++++++++++++++ > mm/sparse.c | 2 ++ > 9 files changed, 23 insertions(+), 26 deletions(-) > > > base-commit: 8ac91e6c6033ebc12c5c1e4aa171b81a662bd70f > -- > 2.18.0 > -- Sincerely yours, Mike.
