Merge tag 'for-linus' of git:https://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:https://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->pc = *(unsigned long *)(fp + 4);
+ frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));
+ 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->sp = *(unsigned long *)(fp - 8);
- frame->pc = *(unsigned long *)(fp - 4);
+ frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 12));
+ frame->sp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 8));
+ 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 */