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| author |   Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-03-30 16:46:00 +0200 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-04-14 16:31:49 +0100 |
| commit | 3e1907d5bf5a1e0b182ee599f92586f0165029e2 (patch) | |
| tree | 1882d1a6d4532815ebe3090d12d3920f0cef3243 /arch/arm64/include/asm/cacheflush.h | |
| parent | arm64: insn: avoid virt_to_page() translations on core kernel symbols (diff) | |
| download | linux-dev-3e1907d5bf5a1e0b182ee599f92586f0165029e2.tar.xz linux-dev-3e1907d5bf5a1e0b182ee599f92586f0165029e2.zip | |
arm64: mm: move vmemmap region right below the linear region
This moves the vmemmap region right below PAGE_OFFSET, aka the start
of the linear region, and redefines its size to be a power of two.
Due to the placement of PAGE_OFFSET in the middle of the address space,
whose size is a power of two as well, this guarantees that virt to
page conversions and vice versa can be implemented efficiently, by
masking and shifting rather than ordinary arithmetic.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions