[v3 9/9] s390: teach platforms not to zero struct pages memory

From: Pavel Tatashin
Date: Fri May 05 2017 - 13:05:13 EST

If we are using deferred struct page initialization feature, most of
"struct page"es are getting initialized after other CPUs are started, and
hence we are benefiting from doing this job in parallel. However, we are
still zeroing all the memory that is allocated for "struct pages" using the
boot CPU. This patch solves this problem, by deferring zeroing "struct
pages" to only when they are initialized on s390 platforms.

Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Reviewed-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
arch/s390/mm/vmem.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 9c75214..ffe9ba1 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -252,7 +252,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
void *new_page;

new_page = vmemmap_alloc_block(PMD_SIZE, node,
- true);
if (!new_page)
goto out;
pmd_val(*pm_dir) = __pa(new_page) | sgt_prot;