On Tue, Aug 09, 2022 at 10:15:47AM +0100, Alexandru Elisei wrote:
> Until commit 031755dbfefb ("arm: enable vmalloc"), the idmap was allocated
> using pgd_alloc(). After that commit, all the page table allocator
> functions were switched to using the page allocator, but pgd_alloc() was
> left unchanged and became unused, with the idmap now being allocated with
> alloc_page().
>
> For arm64, the pgd table size varies based on the page size, which is
> configured by the user. For arm, it will always contain 4 entries (it
> translates bits 31:30 of the input address). To keep things simple and
> consistent with the other functions and across both architectures, modify
> pgd_alloc() to use alloc_page() instead of memalign like the rest of the
> page table allocator functions and use it to allocate the idmap.
>
> Note that when the idmap is created, alloc_ops->memalign is
> memalign_pages() which allocates memory with page granularity. Using
> memalign() as before would still have allocated a full page.
>
> Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
> ---
> lib/arm/asm/pgtable.h | 4 ++--
> lib/arm/mmu.c | 4 ++--
> lib/arm64/asm/pgtable.h | 4 ++--
> 3 files changed, 6 insertions(+), 6 deletions(-)
>
Reviewed-by: Andrew Jones <andrew.jones@xxxxxxxxx>
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