From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
The s390 software large page emulation implements shared page tables
by using page->index of the first tail page from a compound large page
to store page table information. This is set up in arch_prepare_hugepage(),
which is called from alloc_fresh_huge_page_node().
A similar call to arch_prepare_hugepage() is missing for surplus large
pages that are allocated in alloc_buddy_huge_page(), which breaks the
software emulation mode for (surplus) large pages on s390. This patch
adds the missing call to arch_prepare_hugepage(). It will have no effect
on other architectures where arch_prepare_hugepage() is a nop.
Acked-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
---
mm/hugetlb.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
Index: linux/mm/hugetlb.c
===================================================================
--- linux.orig/mm/hugetlb.c
+++ linux/mm/hugetlb.c
@@ -565,7 +565,7 @@ static struct page *alloc_fresh_huge_pag
huge_page_order(h));
if (page) {
if (arch_prepare_hugepage(page)) {
- __free_pages(page, HUGETLB_PAGE_ORDER);
+ __free_pages(page, huge_page_order(h));
return NULL;
}
prep_new_huge_page(h, page, nid);
@@ -665,6 +665,11 @@ static struct page *alloc_buddy_huge_pag
__GFP_REPEAT|__GFP_NOWARN,
huge_page_order(h));
+ if (page && arch_prepare_hugepage(page)) {
+ __free_pages(page, huge_page_order(h));
+ return NULL;
+ }
+
spin_lock(&hugetlb_lock);
if (page) {
/*
--
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