The patch titled
Subject: mm/dev_pfn: exclude MEMORY_DEVICE_PRIVATE while computing virtual address
has been added to the -mm tree. Its filename is
mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/dev_pfn: exclude MEMORY_DEVICE_PRIVATE while computing virtual address
The presence of struct page does not guarantee linear mapping for the pfn
physical range. Device private memory which is non-coherent is excluded
from linear mapping during devm_memremap_pages() though they will still
have struct page coverage.
Change pfn_t_to_virt() to just check for device private memory before
giving out virtual address for a given pfn.
pfn_t_to_virt() actually has no callers. Let's fix it for the 5.2 kernel
and remove it in 5.3.
Link: http://lkml.kernel.org/r/1558089514-25067-1-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pfn_t.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/pfn_t.h~mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address
+++ a/include/linux/pfn_t.h
@@ -68,7 +68,7 @@ static inline phys_addr_t pfn_t_to_phys(
static inline void *pfn_t_to_virt(pfn_t pfn)
{
- if (pfn_t_has_page(pfn))
+ if (pfn_t_has_page(pfn) && !is_device_private_page(pfn_t_to_page(pfn)))
return __va(pfn_t_to_phys(pfn));
return NULL;
}
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-dev_pfn-exclude-memory_device_private-while-computing-virtual-address.patch
