The patch titled
Subject: mm/page_alloc.c: cleanup obsolete KM_USER*
has been added to the -mm tree. Its filename is
mm-page_allocc-cleanup-obsolete-km_user.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_allocc-cleanup-obsolete-km_user.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_allocc-cleanup-obsolete-km_user.patch
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------------------------------------------------------
From: Anisse Astier <anisse@xxxxxxxxx>
Subject: mm/page_alloc.c: cleanup obsolete KM_USER*
It's been five years now that KM_* kmap flags have been removed and that
we can call clear_highpage from any context. So we remove prep_zero_pages
accordingly.
Signed-off-by: Anisse Astier <anisse@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)
diff -puN mm/page_alloc.c~mm-page_allocc-cleanup-obsolete-km_user mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_allocc-cleanup-obsolete-km_user
+++ a/mm/page_alloc.c
@@ -453,20 +453,6 @@ void prep_compound_page(struct page *pag
}
}
-static inline void prep_zero_page(struct page *page, unsigned int order,
- gfp_t gfp_flags)
-{
- int i;
-
- /*
- * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO
- * and __GFP_HIGHMEM from hard or soft interrupt context.
- */
- VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt());
- for (i = 0; i < (1 << order); i++)
- clear_highpage(page + i);
-}
-
#ifdef CONFIG_DEBUG_PAGEALLOC
unsigned int _debug_guardpage_minorder;
bool _debug_pagealloc_enabled __read_mostly;
@@ -1335,7 +1321,8 @@ static int prep_new_page(struct page *pa
kasan_alloc_pages(page, order);
if (gfp_flags & __GFP_ZERO)
- prep_zero_page(page, order, gfp_flags);
+ for (i = 0; i < (1 << order); i++)
+ clear_highpage(page + i);
if (order && (gfp_flags & __GFP_COMP))
prep_compound_page(page, order);
_
Patches currently in -mm which might be from anisse@xxxxxxxxx are
mm-page_allocc-cleanup-obsolete-km_user.patch
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