arm64: Align less than PAGE_SIZE pgds naturally
When the pgd size is smaller than PAGE_SIZE, pgd_alloc() uses kzalloc() to save space. However, this is not always naturally aligned as required by the architecture. This patch creates a kmem_cache for pgd allocations with the correct alignment. The current kernel configurations with 4K pages + 39-bit VA and 64K pages + 42-bit VA use a full page for the pgd and are not affected. The patch is required for 48-bit VA with 64K pages where the pgd is 512 bytes. Reported-by:Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by:
Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com>
parent
04f905a9
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