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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2019-06-28 12:06:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-06-29 16:43:44 +0800 |
| commit | 36d6cb73d5e60cdb2724c21ccba93c964e6a16f9 (patch) | |
| tree | b73c6c6c3a6d893be4c21c4d8a14f7e7f771df4e /include/linux/pfn_t.h | |
| parent | 556e2f6020bf90f63c5dd65e9a2254be6db3185b (diff) | |
| download | lwn-36d6cb73d5e60cdb2724c21ccba93c964e6a16f9.tar.gz lwn-36d6cb73d5e60cdb2724c21ccba93c964e6a16f9.zip | |
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@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/pfn_t.h')
| -rw-r--r-- | include/linux/pfn_t.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index 7bb77850c65a..3c202a11a79e 100644 --- a/include/linux/pfn_t.h +++ b/include/linux/pfn_t.h @@ -68,7 +68,7 @@ static inline phys_addr_t pfn_t_to_phys(pfn_t pfn) 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; } |