ARM: 9311/1: decompressor: move function prototypes to misc.h

A number of prototypes are missing for the decompressor, some
of them are in the .c files that contain the callers, but are
invisible at the function definition:

arch/arm/boot/compressed/misc.c:129:17: error: no previous prototype for '__div0' [-Werror=missing-prototypes]
arch/arm/boot/compressed/misc.c:138:1: error: no previous prototype for 'decompress_kernel' [-Werror=missing-prototypes]
arch/arm/boot/compressed/misc.c:163:6: error: no previous prototype for 'fortify_panic' [-Werror=missing-prototypes]
arch/arm/boot/compressed/decompress.c:63:5: error: no previous prototype for 'do_decompress' [-Werror=missing-prototypes]
arch/arm/boot/compressed/fdt_check_mem_start.c:63:10: error: no previous prototype for 'fdt_check_mem_start' [-Werror=missing-prototypes]

Move these all to misc.h so they are visible by the callee as well.

Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Russell King (Oracle) <[e-mail]>

arch/arm/boot/compressed/atags_to_fdt.c

···
 #include <linux/libfdt_env.h>
 #include <asm/setup.h>
 #include <libfdt.h>
+#include "misc.h"
 
 #if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND)
 #define do_extend_cmdline 1

arch/arm/boot/compressed/fdt_check_mem_start.c

···
 #include <linux/kernel.h>
 #include <linux/libfdt.h>
 #include <linux/sizes.h>
+#include "misc.h"
 
 static const void *get_prop(const void *fdt, const char *node_path,
 			    const char *property, int minlen)

arch/arm/boot/compressed/misc.c

···
 /*
  * gzip declarations
  */
-extern char input_data[];
-extern char input_data_end[];
-
 unsigned char *output_data;
 
 unsigned long free_mem_ptr;
···
 {
 	error("Attempting division by 0!");
 }
-
-extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
-
 
 void
 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,

arch/arm/boot/compressed/misc.h

···
 void error(char *x) __noreturn;
 extern unsigned long free_mem_ptr;
 extern unsigned long free_mem_end_ptr;
+void __div0(void);
+void
+decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
+		  unsigned long free_mem_ptr_end_p, int arch_id);
+void fortify_panic(const char *name);
+int atags_to_fdt(void *atag_list, void *fdt, int total_space);
+uint32_t fdt_check_mem_start(uint32_t mem_start, const void *fdt);
+int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
+
+extern char input_data[];
+extern char input_data_end[];
 
 #endif