linux-stable/arch/arm64
Mike Rapoport ab8f21aa8b arm64: numa: simplify dummy_numa_init()
dummy_numa_init() loops over memblock.memory and passes nid=0 to
numa_add_memblk() which essentially wraps memblock_set_node().  However,
memblock_set_node() can cope with entire memory span itself, so the loop
over memblock.memory regions is redundant.

Using a single call to memblock_set_node() rather than a loop also fixes
an issue with a buggy ACPI firmware in which the SRAT table covers some
but not all of the memory in the EFI memory map.

Jonathan Cameron says:

  This issue can be easily triggered by having an SRAT table which fails
  to cover all elements of the EFI memory map.

  This firmware error is detected and a warning printed. e.g.
  "NUMA: Warning: invalid memblk node 64 [mem 0x240000000-0x27fffffff]"
  At that point we fall back to dummy_numa_init().

  However, the failed ACPI init has left us with our memblocks all broken
  up as we split them when trying to assign them to NUMA nodes.

  We then iterate over the memblocks and add them to node 0.

  numa_add_memblk() calls memblock_set_node() which merges regions that
  were previously split up during the earlier attempt to add them to
  different nodes during parsing of SRAT.

  This means elements are moved in the memblock array and we can end up
  in a different memblock after the call to numa_add_memblk().
  Result is:

  Unable to handle kernel paging request at virtual address 0000000000003a40
  Mem abort info:
    ESR = 0x96000004
    EC = 0x25: DABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
  Data abort info:
    ISV = 0, ISS = 0x00000004
    CM = 0, WnR = 0
  [0000000000003a40] user address but active_mm is swapper
  Internal error: Oops: 96000004 [#1] PREEMPT SMP

  ...

  Call trace:
    sparse_init_nid+0x5c/0x2b0
    sparse_init+0x138/0x170
    bootmem_init+0x80/0xe0
    setup_arch+0x2a0/0x5fc
    start_kernel+0x8c/0x648

Replace the loop with a single call to memblock_set_node() to the entire
memory.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Emil Renner Berthing <kernel@esmil.dk>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20200818151634.14343-5-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-13 18:38:35 -07:00
..
boot ARM: SoC fixes 2020-09-13 14:54:40 -07:00
configs arm64: defconfig: Enable ptn5150 extcon driver 2020-08-20 18:13:16 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-10-13 08:50:16 -07:00
include Merge branch 'compat.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-12 16:44:57 -07:00
kernel Revert "arm64: vdso: Fix compilation with clang older than 8" 2020-10-13 18:38:26 -07:00
kvm arm64 updates for 5.10 2020-10-12 10:00:51 -07:00
lib arm64: mte: Enable swap of tagged pages 2020-09-04 12:46:07 +01:00
mm arm64: numa: simplify dummy_numa_init() 2020-10-13 18:38:35 -07:00
net arm64: bpf: Fix branch offset in JIT 2020-09-17 12:05:36 +01:00
xen arm64: xen: Use modern annotations for assembly functions 2020-01-09 16:09:42 +00:00
Kbuild
Kconfig Revert "arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support" 2020-10-13 18:38:26 -07:00
Kconfig.debug arm64: remove TEXT_OFFSET randomization 2020-06-15 13:10:59 +01:00
Kconfig.platforms ARM: new SoC support for v5.9 2020-08-03 19:38:30 -07:00
Makefile Orphan link sections were a long-standing source of obscure bugs, 2020-10-12 13:39:19 -07:00