The patch titled
mm: make lowmem_page_address() use PFN_PHYS() for improved portability
has been added to the -mm tree. Its filename is
mm-make-lowmem_page_address-use-pfn_phys-for-improved-portability.patch
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------------------------------------------------------
Subject: mm: make lowmem_page_address() use PFN_PHYS() for improved portability
From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
This ensures that platforms with lowmem PAs above 32 bits work correctly
by avoiding truncating the PA during a left shift.
Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Barry Song <21cnbao@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN include/linux/mm.h~mm-make-lowmem_page_address-use-pfn_phys-for-improved-portability include/linux/mm.h
--- a/include/linux/mm.h~mm-make-lowmem_page_address-use-pfn_phys-for-improved-portability
+++ a/include/linux/mm.h
@@ -13,6 +13,7 @@
#include <linux/debug_locks.h>
#include <linux/mm_types.h>
#include <linux/range.h>
+#include <linux/pfn.h>
struct mempolicy;
struct anon_vma;
@@ -595,7 +596,7 @@ static inline void set_page_links(struct
static __always_inline void *lowmem_page_address(struct page *page)
{
- return __va(page_to_pfn(page) << PAGE_SHIFT);
+ return __va(PFN_PHYS(page_to_pfn(page)));
}
#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
_
Patches currently in -mm which might be from cmetcalf@xxxxxxxxxx are
mm-make-lowmem_page_address-use-pfn_phys-for-improved-portability.patch
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