[PATCH 1/2] mm/page_alloc.c: cleanup obsolete KM_USER*

[Anisse Astier <anisse@astier.eu>]

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 simplify
prep_zero_pages accordingly and rename it in the process.

Signed-off-by: Anisse Astier <anisse@astier.eu>
---
 mm/page_alloc.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ebffa0e..05fcec9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -380,16 +380,10 @@ void prep_compound_page(struct page *page, unsigned long order)
 	}
 }
 
-static inline void prep_zero_page(struct page *page, unsigned int order,
-							gfp_t gfp_flags)
+static inline void zero_pages(struct page *page, unsigned int order)
 {
 	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);
 }
@@ -975,7 +969,7 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
 	kasan_alloc_pages(page, order);
 
 	if (gfp_flags & __GFP_ZERO)
-		prep_zero_page(page, order, gfp_flags);
+		zero_pages(page, order);
 
 	if (order && (gfp_flags & __GFP_COMP))
 		prep_compound_page(page, order);
-- 
1.9.3

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