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SubjectRe: [PATCH] parisc: use memblock_alloc() instead of custom get_memblock()
On Tue, Feb 12, 2019 at 03:59:50PM +0200, Mike Rapoport wrote:
> -static void * __init get_memblock(unsigned long size)
> -{
> - static phys_addr_t search_addr __initdata;
> - phys_addr_t phys;
> -
> - if (!search_addr)
> - search_addr = PAGE_ALIGN(__pa((unsigned long) &_end));
> - search_addr = ALIGN(search_addr, size);
> - while (!memblock_is_region_memory(search_addr, size) ||
> - memblock_is_region_reserved(search_addr, size)) {
> - search_addr += size;
> - }
> - phys = search_addr;

This implies to me that the allocation will be 'size' aligned.

> if (!pmd) {
> - pmd = (pmd_t *) get_memblock(PAGE_SIZE << PMD_ORDER);
> + pmd = memblock_alloc(PAGE_SIZE << PMD_ORDER,
> + SMP_CACHE_BYTES);

So why would this only need to be cacheline aligned? It's pretty common
for hardware to require that pgd/pud/pmd/pte tables be naturally aligned.

> @@ -700,7 +683,10 @@ static void __init pagetable_init(void)
> }
> #endif
>
> - empty_zero_page = get_memblock(PAGE_SIZE);
> + empty_zero_page = memblock_alloc(PAGE_SIZE, SMP_CACHE_BYTES);

... and surely the zero page also needs to be page aligned, by definition.

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