Thread (17 messages) 17 messages, 4 authors, 2012-08-16

Re: [PATCH] mm: hugetlb: flush dcache before returning zeroed huge page to userspace

From: Michal Hocko <hidden>
Date: 2012-08-16 18:20:22
Also in: linux-mm, lkml

On Thu 16-08-12 17:09:54, Will Deacon wrote:
On Wed, Aug 08, 2012 at 05:26:07PM +0100, Michal Hocko wrote:
[...]
quoted hunk ↗ jump to hunk
diff --git a/arch/ia64/include/asm/hugetlb.h b/arch/ia64/include/asm/hugetlb.h
index da55c63..2adaa60 100644
--- a/arch/ia64/include/asm/hugetlb.h
+++ b/arch/ia64/include/asm/hugetlb.h
@@ -1,6 +1,7 @@
 #ifndef _ASM_IA64_HUGETLB_H
 #define _ASM_IA64_HUGETLB_H
 
+#include <asm/cacheflush.h>
 #include <asm/page.h>
 
 
@@ -77,4 +78,9 @@ static inline void arch_release_hugepage(struct page *page)
 {
 }
 
+static inline void arch_clear_hugepage_flags(struct page *page)
+{
+	flush_dcache_page(page);
+}
+
Why do we need the hook for ia64? hugetlb_no_page calls clear_huge_page
and that one calls flush_dcache_page (via clear_user_page), right?
The same applies to copy_huge_page for COW.
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
index dfdb95b..52696e6 100644
--- a/arch/powerpc/include/asm/hugetlb.h
+++ b/arch/powerpc/include/asm/hugetlb.h
@@ -2,6 +2,7 @@
 #define _ASM_POWERPC_HUGETLB_H
 
 #ifdef CONFIG_HUGETLB_PAGE
+#include <asm/cacheflush.h>
 #include <asm/page.h>
 
 extern struct kmem_cache *hugepte_cache;
@@ -151,6 +152,11 @@ static inline void arch_release_hugepage(struct page *page)
 {
 }
 
+static inline void arch_clear_hugepage_flags(struct page *page)
+{
+	flush_dcache_page(page);
+}
+
Same here

-- 
Michal Hocko
SUSE Labs
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