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| author |   Ard Biesheuvel <ardb@kernel.org> | 2020-10-08 17:36:01 +0200 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2020-11-09 17:15:37 +0000 |
| commit | 8c96400d6a39be763130a5c493647c57726f7013 (patch) | |
| tree | 0794db8f11e674731069015b34a5c593f8a77ac7 /arch/arm64/include/asm/pgtable.h | |
| parent | arm64: mm: extend linear region for 52-bit VA configurations (diff) | |
| download | linux-dev-8c96400d6a39be763130a5c493647c57726f7013.tar.xz linux-dev-8c96400d6a39be763130a5c493647c57726f7013.zip | |
arm64: mm: make vmemmap region a projection of the linear region
Now that we have reverted the introduction of the vmemmap struct page
pointer and the separate physvirt_offset, we can simplify things further,
and place the vmemmap region in the VA space in such a way that virtual
to page translations and vice versa can be implemented using a single
arithmetic shift.
One happy coincidence resulting from this is that the 48-bit/4k and
52-bit/64k configurations (which are assumed to be the two most
prevalent) end up with the same placement of the vmemmap region. In
a subsequent patch, we will take advantage of this, and unify the
memory maps even more.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Link: https://lore.kernel.org/r/20201008153602.9467-4-ardb@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/pgtable.h')
0 files changed, 0 insertions, 0 deletions