[PATCH] drivers: wait for threaded probes between initcall levels

The multithreaded-probing code has a problem: after one initcall level (eg,
core_initcall) has been processed, we will then start processing the next
level (postcore_initcall) while the kernel threads which are handling
core_initcall are still executing.  This breaks the guarantees which the
layered initcalls previously gave us.

IOW, we want to be multithreaded _within_ an initcall level, but not between
different levels.

Fix that up by causing the probing code to wait for all outstanding probes at
one level to complete before we start processing the next level.

Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 27 insertions, 10 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index e3e83bcaf710..9d873163a7ab 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -216,10 +216,17 @@
 
 #define INITCALLS                                                       \
         *(.initcall1.init)                                              \
+        *(.initcall1s.init)                                             \
         *(.initcall2.init)                                              \
+        *(.initcall2s.init)                                             \
         *(.initcall3.init)                                              \
+        *(.initcall3s.init)                                             \
         *(.initcall4.init)                                              \
+        *(.initcall4s.init)                                             \
         *(.initcall5.init)                                              \
+        *(.initcall5s.init)                                             \
         *(.initcall6.init)                                              \
-        *(.initcall7.init)
+        *(.initcall6s.init)                                             \
+        *(.initcall7.init)                                              \
+        *(.initcall7s.init)
 
diff --git a/include/linux/init.h b/include/linux/init.h
index e92b1455d7af..ff40ea118e3a 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -84,19 +84,29 @@ extern void setup_arch(char **);
  * by link order. 
  * For backwards compatibility, initcall() puts the call in 
  * the device init subsection.
+ *
+ * The `id' arg to __define_initcall() is needed so that multiple initcalls
+ * can point at the same handler without causing duplicate-symbol build errors.
  */
 
-#define __define_initcall(level,fn) \
-        static initcall_t __initcall_##fn __attribute_used__ \
+#define __define_initcall(level,fn,id) \
+        static initcall_t __initcall_##fn##id __attribute_used__ \
         __attribute__((__section__(".initcall" level ".init"))) = fn
 
-#define core_initcall(fn)               __define_initcall("1",fn)
-#define postcore_initcall(fn)           __define_initcall("2",fn)
-#define arch_initcall(fn)               __define_initcall("3",fn)
-#define subsys_initcall(fn)             __define_initcall("4",fn)
-#define fs_initcall(fn)                 __define_initcall("5",fn)
-#define device_initcall(fn)             __define_initcall("6",fn)
-#define late_initcall(fn)               __define_initcall("7",fn)
+#define core_initcall(fn)               __define_initcall("1",fn,1)
+#define core_initcall_sync(fn)          __define_initcall("1s",fn,1s)
+#define postcore_initcall(fn)           __define_initcall("2",fn,2)
+#define postcore_initcall_sync(fn)      __define_initcall("2s",fn,2s)
+#define arch_initcall(fn)               __define_initcall("3",fn,3)
+#define arch_initcall_sync(fn)          __define_initcall("3s",fn,3s)
+#define subsys_initcall(fn)             __define_initcall("4",fn,4)
+#define subsys_initcall_sync(fn)        __define_initcall("4s",fn,4s)
+#define fs_initcall(fn)                 __define_initcall("5",fn,5)
+#define fs_initcall_sync(fn)            __define_initcall("5s",fn,5s)
+#define device_initcall(fn)             __define_initcall("6",fn,6)
+#define device_initcall_sync(fn)        __define_initcall("6s",fn,6s)
+#define late_initcall(fn)               __define_initcall("7",fn,7)
+#define late_initcall_sync(fn)          __define_initcall("7s",fn,7s)
 
 #define __initcall(fn) device_initcall(fn)