The patch titled
Subject: mm: avoid false-positive PageTail() during meminit
has been removed from the -mm tree. Its filename was
mm-make-compound_head-robust-fix.patch
This patch was dropped because it was folded into mm-make-compound_head-robust.patch
------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: avoid false-positive PageTail() during meminit
Since compound_head() rework we encode PageTail() into bit 0 of
page->lru.next (aka page->compound_head). We need to make sure that
page->lru is initialized before first use of compound_head() or
PageTail().
My page-flags patchset makes sure that we don't use PG_reserved on
compound pages. That means we have PageTail() check as eary as in
SetPageReserved() in reserve_bootmem_region()
Let's initialize page->lru before that to avoid false positive from
PageTail().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/page_alloc.c~mm-make-compound_head-robust-fix mm/page_alloc.c
--- a/mm/page_alloc.c~mm-make-compound_head-robust-fix
+++ a/mm/page_alloc.c
@@ -922,8 +922,6 @@ static void init_reserved_page(unsigned
#else
static inline void init_reserved_page(unsigned long pfn)
{
- /* Avoid false-positive PageTail() */
- INIT_LIST_HEAD(&pfn_to_page(pfn)->lru);
}
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
@@ -943,6 +941,10 @@ void __meminit reserve_bootmem_region(un
struct page *page = pfn_to_page(start_pfn);
init_reserved_page(start_pfn);
+
+ /* Avoid false-positive PageTail() */
+ INIT_LIST_HEAD(&page->lru);
+
SetPageReserved(page);
}
}
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-drop-page-slab_page.patch
slab-slub-use-page-rcu_head-instead-of-page-lru-plus-cast.patch
zsmalloc-use-page-private-instead-of-page-first_page.patch
mm-pack-compound_dtor-and-compound_order-into-one-word-in-struct-page.patch
mm-make-compound_head-robust.patch
mm-use-unsigned-int-for-page-order.patch
mm-use-unsigned-int-for-compound_dtor-compound_order-on-64bit.patch
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