mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping

Some of the kmemleak_*() callbacks in memblock, bootmem, CMA convert a
physical address to a virtual one using __va().  However, such physical
addresses may sometimes be located in highmem and using __va() is
incorrect, leading to inconsistent object tracking in kmemleak.

The following functions have been added to the kmemleak API and they take
a physical address as the object pointer.  They only perform the
corresponding action if the address has a lowmem mapping:

kmemleak_alloc_phys
kmemleak_free_part_phys
kmemleak_not_leak_phys
kmemleak_ignore_phys

The affected calling places have been updated to use the new kmemleak
API.

Link: http://lkml.kernel.org/r/1471531432-16503-1-git-send-email-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/bootmem.c b/mm/bootmem.c
index a869f84f44d3..e8a55a3c9feb 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -155,7 +155,7 @@ void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
 {
         unsigned long cursor, end;
 
-        kmemleak_free_part(__va(physaddr), size);
+        kmemleak_free_part_phys(physaddr, size);
 
         cursor = PFN_UP(physaddr);
         end = PFN_DOWN(physaddr + size);
@@ -399,7 +399,7 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 {
         unsigned long start, end;
 
-        kmemleak_free_part(__va(physaddr), size);
+        kmemleak_free_part_phys(physaddr, size);
 
         start = PFN_UP(physaddr);
         end = PFN_DOWN(physaddr + size);
@@ -420,7 +420,7 @@ void __init free_bootmem(unsigned long physaddr, unsigned long size)
 {
         unsigned long start, end;
 
-        kmemleak_free_part(__va(physaddr), size);
+        kmemleak_free_part_phys(physaddr, size);
 
         start = PFN_UP(physaddr);
         end = PFN_DOWN(physaddr + size);