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Diffstat (limited to 'arch/mips/include/asm/pgtable-64.h')
-rw-r--r--arch/mips/include/asm/pgtable-64.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 26dc69d792a..1be4b0fa30d 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -120,9 +120,14 @@
#endif
#define FIRST_USER_ADDRESS 0UL
-#define VMALLOC_START MAP_BASE
+/*
+ * TLB refill handlers also map the vmalloc area into xuseg. Avoid
+ * the first couple of pages so NULL pointer dereferences will still
+ * reliably trap.
+ */
+#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE))
#define VMALLOC_END \
- (VMALLOC_START + \
+ (MAP_BASE + \
min(PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
(1UL << cpu_vmbits)) - (1UL << 32))