ARM fixes for 5.18-rc1:

- avoid unnecessary rebuilds for library objects
 - fix return value of __setup handlers
 - fix invalid input check for "crashkernel=" kernel option
 - silence KASAN warnings in unwind_frame
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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM fixes from Russell King:

 - avoid unnecessary rebuilds for library objects

 - fix return value of __setup handlers

 - fix invalid input check for "crashkernel=" kernel option

 - silence KASAN warnings in unwind_frame

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 9191/1: arm/stacktrace, kasan: Silence KASAN warnings in unwind_frame()
  ARM: 9190/1: kdump: add invalid input check for 'crashkernel=0'
  ARM: 9187/1: JIVE: fix return value of __setup handler
  ARM: 9189/1: decompressor: fix unneeded rebuilds of library objects

arch/arm/boot/compressed/Makefile

@@ -92,6 +92,8 @@ ifeq ($(CONFIG_USE_OF),y)
 OBJS	+= $(libfdt_objs) fdt_check_mem_start.o
 endif
 
+OBJS	+= lib1funcs.o ashldi3.o bswapsdi2.o
+
 targets       := vmlinux vmlinux.lds piggy_data piggy.o \
 		 head.o $(OBJS)
 
@@ -126,8 +128,6 @@ endif
 # Next argument is a linker script
 LDFLAGS_vmlinux += -T
 
-OBJS	+= lib1funcs.o ashldi3.o bswapsdi2.o
-
 # We need to prevent any GOTOFF relocs being used with references
 # to symbols in the .bss section since we cannot relocate them
 # independently from the rest at run time.  This can be achieved by

arch/arm/kernel/setup.c

@@ -1004,7 +1004,8 @@ static void __init reserve_crashkernel(void)
 	total_mem = get_total_mem();
 	ret = parse_crashkernel(boot_command_line, total_mem,
 				&crash_size, &crash_base);
-	if (ret)
+	/* invalid value specified or crashkernel=0 */
+	if (ret || !crash_size)
 		return;
 
 	if (crash_base <= 0) {

arch/arm/kernel/stacktrace.c

@@ -54,17 +54,17 @@ int notrace unwind_frame(struct stackframe *frame)
 		return -EINVAL;
 
 	frame->sp = frame->fp;
-	frame->fp = *(unsigned long *)(fp);
+	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));
-	frame->pc = *(unsigned long *)(fp + 4);
+	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 4));
 #else
 	/* check current frame pointer is within bounds */
 	if (fp < low + 12 || fp > high - 4)
 		return -EINVAL;
 
 	/* restore the registers from the stack frame */
-	frame->fp = *(unsigned long *)(fp - 12);
+	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 12));
-	frame->sp = *(unsigned long *)(fp - 8);
+	frame->sp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 8));
-	frame->pc = *(unsigned long *)(fp - 4);
+	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 4));
 #endif
 #ifdef CONFIG_KRETPROBES
 	if (is_kretprobe_trampoline(frame->pc))

arch/arm/mach-s3c/mach-jive.c

@@ -236,11 +236,11 @@ static int __init jive_mtdset(char *options)
 	unsigned long set;
 
 	if (options == NULL || options[0] == '\0')
-		return 0;
+		return 1;
 
 	if (kstrtoul(options, 10, &set)) {
 		printk(KERN_ERR "failed to parse mtdset=%s\n", options);
-		return 0;
+		return 1;
 	}
 
 	switch (set) {
@@ -256,7 +256,7 @@ static int __init jive_mtdset(char *options)
 		       "using default.", set);
 	}
 
-	return 0;
+	return 1;
 }
 
 /* parse the mtdset= option given to the kernel command line */