powerpc/powernv/memtrace: Fix dcache flushing

Trace memory is cleared and the corresponding dcache lines
are flushed after allocation. However, this should not be
done using the PFN. This adds the missing conversion to
virtual address.

Fixes: 2ac02e5ecec0 ("powerpc/mm: Remove dcache flush from memory remove.")
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210501160254.1179831-1-sandipan@linux.ibm.com

diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
index 71c1262589feaff3cc2158359fdd13669dfed9e8..537a4daed6149dde2b5ce7489261ffb615b07f4c 100644 (file)
--- a/arch/powerpc/platforms/powernv/memtrace.c
+++ b/arch/powerpc/platforms/powernv/memtrace.c
@@ -104,8 +104,8 @@ static void memtrace_clear_range(unsigned long start_pfn,
         * Before we go ahead and use this range as cache inhibited range
         * flush the cache.
         */
-       flush_dcache_range_chunked(PFN_PHYS(start_pfn),
-                                  PFN_PHYS(start_pfn + nr_pages),
+       flush_dcache_range_chunked((unsigned long)pfn_to_kaddr(start_pfn),
+                                  (unsigned long)pfn_to_kaddr(start_pfn + nr_pages),
                                   FLUSH_CHUNK_SIZE);
 }