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| author |   Will Deacon <will.deacon@arm.com> | 2018-02-13 13:14:09 +0000 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2018-02-14 18:58:20 +0000 |
| commit | 2ce77f6d8a9ae9ce6d80397d88bdceb84a2004cd (patch) | |
| tree | 5012c64db317e922cd1c6eaa26f481d9e8f2c479 /arch/arm64/include/asm/hugetlb.h | |
| parent | arm64: Add missing Falkor part number for branch predictor hardening (diff) | |
| download | linux-dev-2ce77f6d8a9ae9ce6d80397d88bdceb84a2004cd.tar.xz linux-dev-2ce77f6d8a9ae9ce6d80397d88bdceb84a2004cd.zip | |
arm64: proc: Set PTE_NG for table entries to avoid traversing them twice
When KASAN is enabled, the swapper page table contains many identical
mappings of the zero page, which can lead to a stall during boot whilst
the G -> nG code continually walks the same page table entries looking
for global mappings.
This patch sets the nG bit (bit 11, which is IGNORED) in table entries
after processing the subtree so we can easily skip them if we see them
a second time.
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/hugetlb.h')
0 files changed, 0 insertions, 0 deletions