On Thu, Mar 06, 2025 at 08:51:17PM +0200, Mike Rapoport wrote:

From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

Allocating the zero pages from memblock is simpler because the memory is
already reserved.

This will also help with pulling out memblock_free_all() to the generic
code and reducing code duplication in arch::mem_init().

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 arch/s390/mm/init.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

Acked-by: Heiko Carstens <hca@linux.ibm.com>

-	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	empty_zero_page = (unsigned long)memblock_alloc(PAGE_SIZE << order, order);
 	if (!empty_zero_page)
 		panic("Out of memory in setup_zero_pages");

This could have been converted to memblock_alloc_or_panic(), but I
guess this can also be done at a later point in time.