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Huang Ying f10d77cded x86, fakenuma: Fix invalid starting node ID 
[ Upstream commit ccae0f36d500aef727f98acd8d0601e6b262a513 ]

Commit:

  cc9aec03e5 ("x86/numa_emulation: Introduce uniform split capability")

uses "-1" as the starting node ID, which causes the strange kernel log as
follows, when "numa=fake=32G" is added to the kernel command line:

    Faking node -1 at [mem 0x0000000000000000-0x0000000893ffffff] (35136MB)
    Faking node 0 at [mem 0x0000001840000000-0x000000203fffffff] (32768MB)
    Faking node 1 at [mem 0x0000000894000000-0x000000183fffffff] (64192MB)
    Faking node 2 at [mem 0x0000002040000000-0x000000283fffffff] (32768MB)
    Faking node 3 at [mem 0x0000002840000000-0x000000303fffffff] (32768MB)

And finally the kernel crashes:

    BUG: Bad page state in process swapper  pfn:00011
    page:(____ptrval____) refcount:0 mapcount:1 mapping:(____ptrval____) index:0x55cd7e44b270 pfn:0x11
    failed to read mapping contents, not a valid kernel address?
    flags: 0x5(locked|uptodate)
    raw: 0000000000000005 000055cd7e44af30 000055cd7e44af50 0000000100000006
    raw: 000055cd7e44b270 000055cd7e44b290 0000000000000000 000055cd7e44b510
    page dumped because: page still charged to cgroup
    page->mem_cgroup:000055cd7e44b510
    Modules linked in:
    CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-rc2 #1
    Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
    Call Trace:
     dump_stack+0x57/0x80
     bad_page.cold+0x63/0x94
     __free_pages_ok+0x33f/0x360
     memblock_free_all+0x127/0x195
     mem_init+0x23/0x1f5
     start_kernel+0x219/0x4f5
     secondary_startup_64+0xb6/0xc0

Fix this bug via using 0 as the starting node ID.  This restores the
original behavior before cc9aec03e5.

[ mingo: Massaged the changelog. ]

Fixes: cc9aec03e5 ("x86/numa_emulation: Introduce uniform split capability")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200904061047.612950-1-ying.huang@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-09-09 19:04:27 +02:00
..
amdtopology.c
cpu_entry_area.c
debug_pagetables.c
dump_pagetables.c
extable.c
fault.c x86/mm: split vmalloc_sync_all() 2020-03-25 08:06:13 +01:00
highmem_32.c
hugetlbpage.c
ident_map.c
init.c x86/mm: Stop printing BRK addresses 2020-06-22 09:05:18 +02:00
init_32.c mm/memory_hotplug: shrink zones when offlining memory 2020-01-29 16:43:27 +01:00
init_64.c mm/memory_hotplug: shrink zones when offlining memory 2020-01-29 16:43:27 +01:00
iomap_32.c
ioremap.c
kasan_init_64.c
kaslr.c
kmmio.c
Makefile
mem_encrypt.c
mem_encrypt_boot.S
mem_encrypt_identity.c
mm_internal.h
mmap.c
mmio-mod.c x86/mmiotrace: Use cpumask_available() for cpumask_var_t variables 2020-06-07 13:17:56 +02:00
mpx.c
numa.c
numa_32.c
numa_64.c
numa_emulation.c x86, fakenuma: Fix invalid starting node ID 2020-09-09 19:04:27 +02:00
numa_internal.h
pageattr-test.c
pageattr.c x86/mm: Fix NX bit clearing issue in kernel_map_pages_in_pgd 2020-02-24 08:34:49 +01:00
pat.c
pat_internal.h
pat_rbtree.c
pf_in.c
pf_in.h
pgtable.c
pgtable_32.c
physaddr.c
physaddr.h
pkeys.c
pti.c
setup_nx.c
srat.c
testmmiotrace.c
tlb.c