binfmt: move more stuff undef CONFIG_COREDUMP

struct linux_binfmt::core_dump and struct min_coredump::min_coredump
are used under CONFIG_COREDUMP only. Shrink those embedded configs
a bit.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/YglbIFyN+OtwVyjW@localhost.localdomain

fs/binfmt_elf.c

@@ -101,8 +101,10 @@ static struct linux_binfmt elf_format = {
 	.module		= THIS_MODULE,
 	.load_binary	= load_elf_binary,
 	.load_shlib	= load_elf_library,
+#ifdef CONFIG_COREDUMP
 	.core_dump	= elf_core_dump,
 	.min_coredump	= ELF_EXEC_PAGESIZE,
+#endif
 };
 
 #define BAD_ADDR(x) (unlikely((unsigned long)(x) >= TASK_SIZE))

fs/binfmt_elf_fdpic.c

@@ -83,8 +83,8 @@ static struct linux_binfmt elf_fdpic_format = {
 	.load_binary	= load_elf_fdpic_binary,
 #ifdef CONFIG_ELF_CORE
 	.core_dump	= elf_fdpic_core_dump,
-#endif
 	.min_coredump	= ELF_EXEC_PAGESIZE,
+#endif
 };
 
 static int __init init_elf_fdpic_binfmt(void)

fs/binfmt_flat.c

@@ -102,8 +102,10 @@ static int flat_core_dump(struct coredump_params *cprm);
 static struct linux_binfmt flat_format = {
 	.module		= THIS_MODULE,
 	.load_binary	= load_flat_binary,
+#ifdef CONFIG_COREDUMP
 	.core_dump	= flat_core_dump,
 	.min_coredump	= PAGE_SIZE
+#endif
 };
 
 /****************************************************************************/

include/linux/binfmts.h

@@ -98,8 +98,10 @@ struct linux_binfmt {
 	struct module *module;
 	int (*load_binary)(struct linux_binprm *);
 	int (*load_shlib)(struct file *);
+#ifdef CONFIG_COREDUMP
 	int (*core_dump)(struct coredump_params *cprm);
 	unsigned long min_coredump;	/* minimal dump size */
+#endif
 } __randomize_layout;
 
 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);