jffs2: Use function instead of macro when initialize compressors

The initialized compressors should be released if one of them
initialize fail, this is the pre-patch for fix the problem, use
function instead of the macro in jffs2_compressors_init() to
simplify the codes, no functional change intended.
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/jffs2/compr.c

@@ -365,19 +365,12 @@ void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig)
 int __init jffs2_compressors_init(void)
 {
 /* Registering compressors */
-#ifdef CONFIG_JFFS2_ZLIB
 	jffs2_zlib_init();
-#endif
-#ifdef CONFIG_JFFS2_RTIME
 	jffs2_rtime_init();
-#endif
-#ifdef CONFIG_JFFS2_RUBIN
 	jffs2_rubinmips_init();
 	jffs2_dynrubin_init();
-#endif
-#ifdef CONFIG_JFFS2_LZO
 	jffs2_lzo_init();
-#endif
+
 /* Setting default compression mode */
 #ifdef CONFIG_JFFS2_CMODE_NONE
 	jffs2_compression_mode = JFFS2_COMPR_MODE_NONE;
@@ -401,18 +394,10 @@ int __init jffs2_compressors_init(void)
 int jffs2_compressors_exit(void)
 {
 /* Unregistering compressors */
-#ifdef CONFIG_JFFS2_LZO
 	jffs2_lzo_exit();
-#endif
-#ifdef CONFIG_JFFS2_RUBIN
 	jffs2_dynrubin_exit();
 	jffs2_rubinmips_exit();
-#endif
-#ifdef CONFIG_JFFS2_RTIME
 	jffs2_rtime_exit();
-#endif
-#ifdef CONFIG_JFFS2_ZLIB
 	jffs2_zlib_exit();
-#endif
 	return 0;
 }

fs/jffs2/compr.h

@@ -88,18 +88,32 @@ int jffs2_rubinmips_init(void);
 void jffs2_rubinmips_exit(void);
 int jffs2_dynrubin_init(void);
 void jffs2_dynrubin_exit(void);
+#else
+static inline int jffs2_rubinmips_init(void) { return 0; }
+static inline void jffs2_rubinmips_exit(void) {}
+static inline int jffs2_dynrubin_init(void) { return 0; }
+static inline void jffs2_dynrubin_exit(void) {}
 #endif
 #ifdef CONFIG_JFFS2_RTIME
-int jffs2_rtime_init(void);
-void jffs2_rtime_exit(void);
+extern int jffs2_rtime_init(void);
+extern void jffs2_rtime_exit(void);
+#else
+static inline int jffs2_rtime_init(void) { return 0; }
+static inline void jffs2_rtime_exit(void) {}
 #endif
 #ifdef CONFIG_JFFS2_ZLIB
-int jffs2_zlib_init(void);
-void jffs2_zlib_exit(void);
+extern int jffs2_zlib_init(void);
+extern void jffs2_zlib_exit(void);
+#else
+static inline int jffs2_zlib_init(void) { return 0; }
+static inline void jffs2_zlib_exit(void) {}
 #endif
 #ifdef CONFIG_JFFS2_LZO
-int jffs2_lzo_init(void);
-void jffs2_lzo_exit(void);
+extern int jffs2_lzo_init(void);
+extern void jffs2_lzo_exit(void);
+#else
+static inline int jffs2_lzo_init(void) { return 0; }
+static inline void jffs2_lzo_exit(void) {}
 #endif
 
 #endif /* __JFFS2_COMPR_H__ */