coredump: update coredump-related headers

Create a new header file, fs/coredump.h, which contains functions only
used by the new coredump.c.  It also moves do_coredump to the
include/linux/coredump.h header file, for consistency.
Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/coredump.c

@@ -14,6 +14,7 @@
 #include <linux/key.h>
 #include <linux/personality.h>
 #include <linux/binfmts.h>
+#include <linux/coredump.h>
 #include <linux/utsname.h>
 #include <linux/pid_namespace.h>
 #include <linux/module.h>
@@ -39,6 +40,7 @@
 
 #include <trace/events/task.h>
 #include "internal.h"
+#include "coredump.h"
 
 #include <trace/events/sched.h>
 

fs/coredump.h

+#ifndef _FS_COREDUMP_H
+#define _FS_COREDUMP_H
+
+extern int __get_dumpable(unsigned long mm_flags);
+
+#endif

fs/exec.c

@@ -63,6 +63,7 @@
 
 #include <trace/events/task.h>
 #include "internal.h"
+#include "coredump.h"
 
 #include <trace/events/sched.h>
 

include/linux/binfmts.h

@@ -132,11 +132,6 @@ extern int copy_strings_kernel(int argc, const char *const *argv,
 			       struct linux_binprm *bprm);
 extern int prepare_bprm_creds(struct linux_binprm *bprm);
 extern void install_exec_creds(struct linux_binprm *bprm);
-#ifdef CONFIG_COREDUMP
-extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
-#else
-static inline void do_coredump(long signr, int exit_code, struct pt_regs *regs) {}
-#endif
 extern void set_binfmt(struct linux_binfmt *new);
 extern void free_bprm(struct linux_binprm *);
 

include/linux/coredump.h

@@ -11,5 +11,10 @@
  */
 extern int dump_write(struct file *file, const void *addr, int nr);
 extern int dump_seek(struct file *file, loff_t off);
+#ifdef CONFIG_COREDUMP
+extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
+#else
+static inline void do_coredump(long signr, int exit_code, struct pt_regs *regs) {}
+#endif
 
 #endif /* _LINUX_COREDUMP_H */

include/linux/sched.h

@@ -405,7 +405,6 @@ static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
 
 extern void set_dumpable(struct mm_struct *mm, int value);
 extern int get_dumpable(struct mm_struct *mm);
-extern int __get_dumpable(unsigned long mm_flags);
 
 /* get/set_dumpable() values */
 #define SUID_DUMPABLE_DISABLED	0

kernel/signal.c

@@ -17,6 +17,7 @@
 #include <linux/fs.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
+#include <linux/coredump.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/ptrace.h>