diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2020-11-10 19:05:11 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-11-12 08:32:25 +0000 |
| commit | c1090bb10d5e15906d296936e64317e35c43f21d (patch) | |
| tree | caf928e4d9bd18669e753444458088a7f6654bb9 /arch/arm64/mm/init.c | |
| parent | 68af6d2483dbd0385317bc87a338b155be75eeb6 (diff) | |
| download | linux-c1090bb10d5e15906d296936e64317e35c43f21d.tar.gz linux-c1090bb10d5e15906d296936e64317e35c43f21d.tar.bz2 linux-c1090bb10d5e15906d296936e64317e35c43f21d.zip | |
arm64: mm: don't assume struct page is always 64 bytes
Commit 8c96400d6a39be7 simplified the page-to-virt and virt-to-page
conversions, based on the assumption that struct page is always 64
bytes in size, in which case we can use a single signed shift to
perform the conversion (provided that the vmemmap array is placed
appropriately in the kernel VA space)
Unfortunately, this assumption turns out not to hold, and so we need
to revert part of this commit, and go back to an affine transformation.
Given that all the quantities involved are compile time constants,
this should not make any practical difference.
Fixes: 8c96400d6a39 ("arm64: mm: make vmemmap region a projection of the linear region")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20201110180511.29083-1-ardb@kernel.org
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm/init.c')
| -rw-r--r-- | arch/arm64/mm/init.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 3a5e9f9298e9..7e15d92836d8 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -502,8 +502,6 @@ static void __init free_unused_memmap(void) */ void __init mem_init(void) { - BUILD_BUG_ON(!is_power_of_2(sizeof(struct page))); - if (swiotlb_force == SWIOTLB_FORCE || max_pfn > PFN_DOWN(arm64_dma_phys_limit ? : arm64_dma32_phys_limit)) swiotlb_init(1); |