Automatic merge of 'next-test' into merge-test (2023-08-31 11:23)

Author: mpe

arch/powerpc/mm/init_64.c

@@ -494,12 +494,23 @@ static int __init dt_scan_mmu_pid_width(unsigned long node,
 	return 1;
 }
 
+/*
+ * Outside hotplug the kernel uses this value to map the kernel direct map
+ * with radix. To be compatible with older kernels, let's keep this value
+ * as 16M which is also SECTION_SIZE with SPARSEMEM. We can ideally map
+ * things with 1GB size in the case where we don't support hotplug.
+ */
+#ifndef CONFIG_MEMORY_HOTPLUG
+#define DEFAULT_MEMORY_BLOCK_SIZE	SZ_16M
+#else
+#define DEFAULT_MEMORY_BLOCK_SIZE	MIN_MEMORY_BLOCK_SIZE
+#endif
+
 static void update_memory_block_size(unsigned long *block_size, unsigned long mem_size)
 {
-	unsigned long section_size = 1UL << SECTION_SIZE_BITS;
-
-	for (; *block_size > section_size; *block_size >>= 2) {
+	unsigned long min_memory_block_size = DEFAULT_MEMORY_BLOCK_SIZE;
 
+	for (; *block_size > min_memory_block_size; *block_size >>= 2) {
 		if ((mem_size & *block_size) == 0)
 			break;
 	}
@@ -529,7 +540,7 @@ static int __init probe_memory_block_size(unsigned long node, const char *uname,
 			/*
 			 * Nothing in the device tree
 			 */
-			*block_size = MIN_MEMORY_BLOCK_SIZE;
+			*block_size = DEFAULT_MEMORY_BLOCK_SIZE;
 		else
 			*block_size = of_read_number(prop, dt_root_size_cells);
 		/*
@@ -580,8 +591,12 @@ static int __init probe_memory_block_size(unsigned long node, const char *uname,
 		 */
 		compatible = of_get_flat_dt_prop(node, "compatible", NULL);
 		if (compatible && !strcmp(compatible, "ibm,coherent-device-memory")) {
-			*block_size = SZ_256M;
-			return 1;
+			if (*block_size > SZ_256M)
+				*block_size = SZ_256M;
+			/*
+			 * We keep 256M as the upper limit with GPU present.
+			 */
+			return 0;
 		}
 	}
 	/* continue looking for other memory device types */

arch/powerpc/xmon/Makefile

@@ -12,6 +12,10 @@ ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
 
 ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
 
+# Clang stores addresses on the stack causing the frame size to blow
+# out. See https://github.com/ClangBuiltLinux/linux/issues/252
+ccflags-$(CONFIG_CC_IS_CLANG) += -Wframe-larger-than=4096
+
 obj-y			+= xmon.o nonstdio.o spr_access.o xmon_bpts.o
 
 ifdef CONFIG_XMON_DISASSEMBLY