File crash-SLE15-SP1-Fix-for-PPC64-kernel-virtual-address-translation-in.patch of Package crash.16727

From 28fa7bd09013455b5ddc020dea4706278cda0d65 Mon Sep 17 00:00:00 2001
From: Dave Anderson <anderson@redhat.com>
Date: Tue, 19 Jun 2018 16:31:54 -0400
Subject: [PATCH] Fix for PPC64 kernel virtual address translation in Linux
 4.17 and later kernels with commit c2b4d8b7417a59b7f9a52d0d8402f5257cbbd398,
 titled "powerpc/mm/hash64: Increase the VA range", in which the maximum
 virtual address value has been increased to 4PB.  Without the patch, the
 translation/access of high vmalloc space addresses fails; for example, the
 "kmem -[sS]" option fails the translation of per-cpu kmem_cache_cpu addresses
 located in vmalloc space, with the error messages "kmem: invalid kernel
 virtual address: <address> type: kmem_cache_cpu.freelist" and "kmem: invalid
 kernel virtual address: <address>  type: kmem_cache_cpu.page", and the "vtop"
 command shows the addresses as "(not mapped)". (hbathini@linux.ibm.com)

[note: apply on 4.12+ for SLE 15 SP1 - incompatible with SLE 15 SP0]

---
 defs.h  | 1 +
 ppc64.c | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/defs.h b/defs.h
index 6e6f6be50fa4..e6e3850c819d 100644
--- a/defs.h
+++ b/defs.h
@@ -3977,6 +3977,7 @@ struct efi_memory_desc_t {
 #define PMD_INDEX_SIZE_L4_64K_4_12 10
 #define PUD_INDEX_SIZE_L4_64K_4_12 7
 #define PGD_INDEX_SIZE_L4_64K_4_12 8
+#define PUD_INDEX_SIZE_L4_64K_4_17 10
 #define PTE_INDEX_SIZE_RADIX_64K  5
 #define PMD_INDEX_SIZE_RADIX_64K  9
 #define PUD_INDEX_SIZE_RADIX_64K  9
diff --git a/ppc64.c b/ppc64.c
index 0dd8a2af5818..f5d0dacaca2b 100644
--- a/ppc64.c
+++ b/ppc64.c
@@ -451,7 +451,10 @@ ppc64_init(int when)
 
 					if (THIS_KERNEL_VERSION >= LINUX(4,12,0)) {
 						m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_12;
-						m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
+						if (THIS_KERNEL_VERSION >= LINUX(4,12,0)) /* SLE15 SP1 */
+							m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_17;
+						else
+							m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
 						m->l4_index_size = PGD_INDEX_SIZE_L4_64K_4_12;
 					} else {
 						m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_6;
-- 
2.19.2
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