commit bf48dd4e9926515345cad06c1bfce49d7a057a26
Author: Dave Anderson <anderson@redhat.com>
Date:   Mon Jun 10 14:12:52 2019 -0400

    Fix for Linux 4.16 and later ARM64 kernels that contain kernel commit
    fa2a8445b1d3810c52f2a6b3a006456bd1aacb7e, titled "arm64: allow ID map
    to be extended to 52 bits", and which have been configured with both
    CONFIG_DEVMEM=y and CONFIG_STRICT_DEVMEM=y.  Without the patch, an
    inconsequential error message indicating "crash: read error: kernel
    virtual address: <address> type: idmap_ptrs_per_pgd" is displayed
    during initialization.
    (anderson@redhat.com)

diff --git a/arm64.c b/arm64.c
index 5b82263..6b34b5f 100644
--- a/arm64.c
+++ b/arm64.c
@@ -283,7 +283,7 @@ arm64_init(int when)
 		case 65536:
 			if (kernel_symbol_exists("idmap_ptrs_per_pgd") &&
 			    readmem(symbol_value("idmap_ptrs_per_pgd"), KVADDR,
-			    &value, sizeof(ulong), "idmap_ptrs_per_pgd", RETURN_ON_ERROR))
+			    &value, sizeof(ulong), "idmap_ptrs_per_pgd", QUIET|RETURN_ON_ERROR))
 				machdep->ptrs_per_pgd = value;
 		
 			if (machdep->machspec->VA_BITS > PGDIR_SHIFT_L3_64K) {