diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-11-07 15:16:06 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-11-08 18:54:03 +0100 |
| commit | 24cc61d8cb5a9232fadf21a830061853c1268fdd (patch) | |
| tree | b8536afd53e89dc7d859a871f084ad4453f563aa /arch/arm/mm/tlb-v6.S | |
| parent | arm64: mm: define NET_IP_ALIGN to 0 (diff) | |
| download | linux-24cc61d8cb5a9232fadf21a830061853c1268fdd.tar.xz linux-24cc61d8cb5a9232fadf21a830061853c1268fdd.zip | |
arm64: memblock: don't permit memblock resizing until linear mapping is up
Bhupesh reports that having numerous memblock reservations at early
boot may result in the following crash:
Unable to handle kernel paging request at virtual address ffff80003ffe0000
...
Call trace:
__memcpy+0x110/0x180
memblock_add_range+0x134/0x2e8
memblock_reserve+0x70/0xb8
memblock_alloc_base_nid+0x6c/0x88
__memblock_alloc_base+0x3c/0x4c
memblock_alloc_base+0x28/0x4c
memblock_alloc+0x2c/0x38
early_pgtable_alloc+0x20/0xb0
paging_init+0x28/0x7f8
This is caused by the fact that we permit memblock resizing before the
linear mapping is up, and so the memblock_reserved() array is moved
into memory that is not mapped yet.
So let's ensure that this crash can no longer occur, by deferring to
call to memblock_allow_resize() to after the linear mapping has been
created.
Reported-by: Bhupesh Sharma <bhsharma@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/mm/tlb-v6.S')
0 files changed, 0 insertions, 0 deletions