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s390/mm: Get total ram pages from memblock

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On s390, zero page's size relies on total ram pages.

Since we plan to move the accounting into __free_pages_core(),
totalram_pages may not represent the total usable pages on system
at this point when defer_init is enabled.

We can get the total usable pages from memblock directly. The size maybe
not accurate due to the alignment, but enough for the calculation.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Mike Rapoport (IBM) <rppt@kernel.org>
CC: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240616013537.20338-1-richard.weiyang@gmail.com
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Wei Yang 2024-06-16 01:35:37 +00:00 committed by Alexander Gordeev
parent 7c67928648
commit 37db17c100
1 changed files with 2 additions and 1 deletions
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3
arch/s390/mm/init.c
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@ -62,6 +62,7 @@ EXPORT_SYMBOL(zero_page_mask);
static void __init setup_zero_pages(void)
{
unsigned long total_pages = PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size());
unsigned int order;
struct page *page;
int i;
@ -70,7 +71,7 @@ static void __init setup_zero_pages(void)
order = 7;
/* Limit number of empty zero pages for small memory sizes */
while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
while (order > 2 && (total_pages >> 10) < (1UL << order))
order--;
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);