diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 0480c61dbb4f..73eaa8c2536a 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -110,7 +110,7 @@
 #define PAGE_END		(_PAGE_END(VA_BITS_MIN))
 #endif /* CONFIG_KASAN */
 
-#define PHYSMEM_END		__pa(PAGE_END - 1)
+#define DIRECT_MAP_PHYSMEM_END	__pa(PAGE_END - 1)
 
 #define MIN_THREAD_SHIFT	(14 + KASAN_THREAD_SHIFT)
 
diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h
index f3d257c45225..d63576608ce7 100644
--- a/arch/x86/include/asm/page_64.h
+++ b/arch/x86/include/asm/page_64.h
@@ -17,7 +17,7 @@ extern unsigned long phys_base;
 extern unsigned long page_offset_base;
 extern unsigned long vmalloc_base;
 extern unsigned long vmemmap_base;
-extern unsigned long physmem_end;
+extern unsigned long direct_map_physmem_end;
 
 static __always_inline unsigned long __phys_addr_nodebug(unsigned long x)
 {
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index a98e53491a4e..ec68f8369bdc 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -141,7 +141,7 @@ extern unsigned int ptrs_per_p4d;
 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
 
 #ifdef CONFIG_RANDOMIZE_MEMORY
-# define PHYSMEM_END		physmem_end
+# define DIRECT_MAP_PHYSMEM_END	direct_map_physmem_end
 #endif
 
 /*
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ff253648706f..5a564130b9d0 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -961,7 +961,7 @@ int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
 	unsigned long end = ((start_pfn + nr_pages) << PAGE_SHIFT) - 1;
 	int ret;
 
-	if (WARN_ON_ONCE(end > PHYSMEM_END))
+	if (WARN_ON_ONCE(end > DIRECT_MAP_PHYSMEM_END))
 		return -ERANGE;
 
 	ret = __add_pages(nid, start_pfn, nr_pages, params);
diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c
index 230f1dee4f09..70d3353c92fa 100644
--- a/arch/x86/mm/kaslr.c
+++ b/arch/x86/mm/kaslr.c
@@ -52,7 +52,7 @@ static __initdata struct kaslr_memory_region {
 } kaslr_regions[] = {
 	{
 		.base	= &page_offset_base,
-		.end	= &physmem_end,
+		.end	= &direct_map_physmem_end,
 	},
 	{
 		.base	= &vmalloc_base,
@@ -62,8 +62,12 @@ static __initdata struct kaslr_memory_region {
 	},
 };
 
-/* The end of the possible address space for physical memory */
-unsigned long physmem_end __ro_after_init;
+/*
+ * The end of the physical address space that can be mapped directly by the
+ * kernel. This starts out at (1<<MAX_PHYSMEM_BITS) - 1), but KASLR may reduce
+ * that in order to increase the available entropy for mapping other regions.
+ */
+unsigned long direct_map_physmem_end __ro_after_init;
 
 /* Get size in bytes used by the memory region */
 static inline unsigned long get_padding(struct kaslr_memory_region *region)
@@ -94,7 +98,7 @@ void __init kernel_randomize_memory(void)
 	BUILD_BUG_ON(vaddr_end > __START_KERNEL_map);
 
 	/* Preset the end of the possible address space for physical memory */
-	physmem_end = ((1ULL << MAX_PHYSMEM_BITS) - 1);
+	direct_map_physmem_end = ((1ULL << MAX_PHYSMEM_BITS) - 1);
 	if (!kaslr_memory_enabled())
 		return;
 
@@ -145,7 +149,7 @@ void __init kernel_randomize_memory(void)
 		vaddr += get_padding(&kaslr_regions[i]);
 		/*
 		 * KASLR trims the maximum possible size of the
-		 * direct-map. Update the physmem_end boundary.
+		 * direct-map. Update the direct_map_physmem_end boundary.
 		 * No rounding required as the region starts
 		 * PUD aligned and size is in units of TB.
 		 */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8f5394d75ce2..4570f33e2429 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -97,11 +97,11 @@ extern const int mmap_rnd_compat_bits_max;
 extern int mmap_rnd_compat_bits __read_mostly;
 #endif
 
-#ifndef PHYSMEM_END
+#ifndef DIRECT_MAP_PHYSMEM_END
 # ifdef MAX_PHYSMEM_BITS
-# define PHYSMEM_END	((1ULL << MAX_PHYSMEM_BITS) - 1)
+# define DIRECT_MAP_PHYSMEM_END	((1ULL << MAX_PHYSMEM_BITS) - 1)
 # else
-# define PHYSMEM_END	(((phys_addr_t)-1)&~(1ULL<<63))
+# define DIRECT_MAP_PHYSMEM_END	(((phys_addr_t)-1)&~(1ULL<<63))
 # endif
 #endif
 
diff --git a/kernel/resource.c b/kernel/resource.c
index 4101016e8b20..d2c8143ae4ff 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -1869,7 +1869,7 @@ static resource_size_t gfr_start(struct resource *base, resource_size_t size,
 	if (flags & GFR_DESCENDING) {
 		resource_size_t end;
 
-		end = min_t(resource_size_t, base->end, PHYSMEM_END);
+		end = min_t(resource_size_t, base->end, DIRECT_MAP_PHYSMEM_END);
 		return end - size + 1;
 	}
 
@@ -1886,7 +1886,7 @@ static bool gfr_continue(struct resource *base, resource_size_t addr,
 	 * @size did not wrap 0.
 	 */
 	return addr > addr - size &&
-	       addr <= min_t(resource_size_t, base->end, PHYSMEM_END);
+	       addr <= min_t(resource_size_t, base->end, DIRECT_MAP_PHYSMEM_END);
 }
 
 static resource_size_t gfr_next(resource_size_t addr, resource_size_t size,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 621ae1015106..c43b4e7fb298 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1681,7 +1681,7 @@ struct range __weak arch_get_mappable_range(void)
 
 struct range mhp_get_pluggable_range(bool need_mapping)
 {
-	const u64 max_phys = PHYSMEM_END;
+	const u64 max_phys = DIRECT_MAP_PHYSMEM_END;
 	struct range mhp_range;
 
 	if (need_mapping) {
diff --git a/mm/sparse.c b/mm/sparse.c
index dc38539f8560..4cb9793f0b52 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -129,7 +129,7 @@ static inline int sparse_early_nid(struct mem_section *section)
 static void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
 						unsigned long *end_pfn)
 {
-	unsigned long max_sparsemem_pfn = (PHYSMEM_END + 1) >> PAGE_SHIFT;
+	unsigned long max_sparsemem_pfn = (DIRECT_MAP_PHYSMEM_END + 1) >> PAGE_SHIFT;
 
 	/*
 	 * Sanity checks - do not allow an architecture to pass