init: allow initcall tables to be emitted using relative references

[sfrench/cifs-2.6.git] / include / linux / init.h

diff --git a/include/linux/init.h b/include/linux/init.h
index bc27cf03c41ea5a4b19d87bb82da0f3d36e9390e..2538d176dd1fac053c6ccac3ff907ab4e66b8118 100644 (file)
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -116,8 +116,24 @@
 typedef int (*initcall_t)(void);
 typedef void (*exitcall_t)(void);
 
-extern initcall_t __con_initcall_start[], __con_initcall_end[];
-extern initcall_t __security_initcall_start[], __security_initcall_end[];
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+typedef int initcall_entry_t;
+
+static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
+{
+       return offset_to_ptr(entry);
+}
+#else
+typedef initcall_t initcall_entry_t;
+
+static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
+{
+       return *entry;
+}
+#endif
+
+extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
+extern initcall_entry_t __security_initcall_start[], __security_initcall_end[];
 
 /* Used for contructor calls. */
 typedef void (*ctor_fn_t)(void);
@@ -167,9 +183,20 @@ extern bool initcall_debug;
  * as KEEP() in the linker script.
  */
 
-#define __define_initcall(fn, id) \
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+#define ___define_initcall(fn, id, __sec)                      \
+       __ADDRESSABLE(fn)                                       \
+       asm(".section   \"" #__sec ".init\", \"a\"      \n"     \
+       "__initcall_" #fn #id ":                        \n"     \
+           ".long      " #fn " - .                     \n"     \
+           ".previous                                  \n");
+#else
+#define ___define_initcall(fn, id, __sec) \
        static initcall_t __initcall_##fn##id __used \
-       __attribute__((__section__(".initcall" #id ".init"))) = fn;
+               __attribute__((__section__(#__sec ".init"))) = fn;
+#endif
+
+#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
 
 /*
  * Early initcalls run before initializing SMP.
@@ -208,13 +235,8 @@ extern bool initcall_debug;
 #define __exitcall(fn)                                         \
        static exitcall_t __exitcall_##fn __exit_call = fn
 
-#define console_initcall(fn)                                   \
-       static initcall_t __initcall_##fn                       \
-       __used __section(.con_initcall.init) = fn
-
-#define security_initcall(fn)                                  \
-       static initcall_t __initcall_##fn                       \
-       __used __section(.security_initcall.init) = fn
+#define console_initcall(fn)   ___define_initcall(fn,, .con_initcall)
+#define security_initcall(fn)  ___define_initcall(fn,, .security_initcall)
 
 struct obs_kernel_param {
        const char *str;