[v3 6/9] sparc64: teach sparc not to zero struct pages memory

From	Pavel Tatashin <pasha.tatashin@oracle.com>
Newsgroups	linux.kernel
Subject	[v3 6/9] sparc64: teach sparc not to zero struct pages memory
Date	2017-05-05 19:10 +0200
Message-ID	<tDOTU-4Dx-7@gated-at.bofh.it> (permalink)
References	<tDOTT-4Dx-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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 SPARC.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
---
 arch/sparc/mm/init_64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index c72d070..dae040c 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2546,7 +2546,7 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
 		pte = pmd_val(*pmd);
 		if (!(pte & _PAGE_VALID)) {
 			void *block = vmemmap_alloc_block(PMD_SIZE, node,
-							  true);
+							  VMEMMAP_ZERO);
 
 			if (!block)
 				return -ENOMEM;
-- 
1.7.1

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[v3 6/9] sparc64: teach sparc not to zero struct pages memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-05-05 19:10 +0200

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