arm64 fixes for 5.2

- Fix module allocation when running with KASLR enabled
 
 - Fix broken build due to bug in LLVM linker (ld.lld)
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "Fix a build failure with the LLVM linker and a module allocation
  failure when KASLR is active:

   - Fix module allocation when running with KASLR enabled

   - Fix broken build due to bug in LLVM linker (ld.lld)"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64/efi: Mark __efistub_stext_offset as an absolute symbol explicitly
  arm64: kaslr: keep modules inside module region when KASAN is enabled

arch/arm64/kernel/image.h

@@ -67,7 +67,11 @@
 
 #ifdef CONFIG_EFI
 
-__efistub_stext_offset = stext - _text;
+/*
+ * Use ABSOLUTE() to avoid ld.lld treating this as a relative symbol:
+ * https://github.com/ClangBuiltLinux/linux/issues/561
+ */
+__efistub_stext_offset = ABSOLUTE(stext - _text);
 
 /*
  * The EFI stub has its own symbol namespace prefixed by __efistub_, to

arch/arm64/kernel/module.c

@@ -21,6 +21,7 @@
 
 void *module_alloc(unsigned long size)
 {
+	u64 module_alloc_end = module_alloc_base + MODULES_VSIZE;
 	gfp_t gfp_mask = GFP_KERNEL;
 	void *p;
 
@@ -28,9 +29,12 @@ void *module_alloc(unsigned long size)
 	if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
 		gfp_mask |= __GFP_NOWARN;
 
+	if (IS_ENABLED(CONFIG_KASAN))
+		/* don't exceed the static module region - see below */
+		module_alloc_end = MODULES_END;
+
 	p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
-				module_alloc_base + MODULES_VSIZE,
+				module_alloc_end, gfp_mask, PAGE_KERNEL_EXEC, 0,
-				gfp_mask, PAGE_KERNEL_EXEC, 0,
 				NUMA_NO_NODE, __builtin_return_address(0));
 
 	if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&