btrfs: move assert helpers out of ctree.h

These call functions that aren't defined in, or will be moved out of,
ctree.h  Move them to super.c where the other assert/error message code
is defined. Drop the __noreturn attribute for btrfs_assertfail as
objtool does not like it and fails with warnings like

  fs/btrfs/dir-item.o: warning: objtool: .text.unlikely: unexpected end of section
  fs/btrfs/xattr.o: warning: objtool: btrfs_setxattr() falls through to next function btrfs_setxattr_trans.cold()
  fs/btrfs/xattr.o: warning: objtool: .text.unlikely: unexpected end of section
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -3333,18 +3333,11 @@ do {								\
 } while (0)
 
 #ifdef CONFIG_BTRFS_ASSERT
-__cold __noreturn
-static inline void assertfail(const char *expr, const char *file, int line)
-{
-	pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
-	BUG();
-}
+void __cold btrfs_assertfail(const char *expr, const char *file, int line);
 
 #define ASSERT(expr)						\
-	(likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__))
-
+	(likely(expr) ? (void)0 : btrfs_assertfail(#expr, __FILE__, __LINE__))
 #else
-static inline void assertfail(const char *expr, const char* file, int line) { }
 #define ASSERT(expr)	(void)(expr)
 #endif
 
@@ -3404,12 +3397,7 @@ static inline unsigned long get_eb_page_index(unsigned long offset)
 #define EXPORT_FOR_TESTS
 #endif
 
-__cold
-static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
-{
-	btrfs_err(fs_info,
-"Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
-}
+void __cold btrfs_print_v0_err(struct btrfs_fs_info *fs_info);
 
 __printf(5, 6)
 __cold

fs/btrfs/super.c

@@ -305,6 +305,20 @@ void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt,
 }
 #endif
 
+#ifdef CONFIG_BTRFS_ASSERT
+void __cold btrfs_assertfail(const char *expr, const char *file, int line)
+{
+	pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
+	BUG();
+}
+#endif
+
+void __cold btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
+{
+	btrfs_err(fs_info,
+"Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
+}
+
 #if BITS_PER_LONG == 32
 void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
 {