[Miscellaneous Android Development] rwgast:
Im so sorry if this is in the wrong place but im a developer working on my first kernel and my question is only going to get some help by the most elite ROM dev's out there.

Ok so i got the BFS patch for the kernel im currently working on which is 2.6.32.9. Of course the patch is meant for a mainline kernel and not an Android kernel so i went through the patch file and applied the patch by hand, it was a pretty smooth process the diffs in the bfs patch were all the same code just wouldn't apply because all the line numbers were off. My first attempt bombed so i must have made some mistakes it was my first time patching by hand! Anyways took another crack and recompiled the kernel after every file patched so i could basically debug compiling problems well it all went smooth.

Heres the problem though, kernel compiles fine with out bfs checked, with it checked it compile a hell of alot of the kernel, but it eventually fails and it make no seance after my investigation of things. Here is my error

drivers/built-in.o: In function `mmc_wait_for_req':
lowmemorykiller.c:(.text+0xd2b3c): undefined reference to `wait_for_completion_io'
make: *** [.tmp_vmlinux1] Error 1

I found the decleration for wait_for_completion_io in kernel/sched.c the only thing i changed in sched.c was to at line 1 and it was basically to include sched_bfs.c, if the scheduler was seleted in the config, heres the patch stuff for sched, all i did was add the three lines to check if bfs was set in the config and then added the #endif at the bottom

*/
Index: linux-2.6.32-ck2/kernel/sched.c
===================================================================
--- linux-2.6.32-ck2.orig/kernel/sched.c	2009-12-03 21:02:30.565685697 +1100
+++ linux-2.6.32-ck2/kernel/sched.c	2009-12-29 10:15:00.820070753 +1100
@@ -1,3 +1,6 @@
+#ifdef CONFIG_SCHED_BFS
+#include "sched_bfs.c"
+#else
/*
* kernel/sched.c
*
@@ -10909,3 +10912,4 @@ void synchronize_sched_expedited(void)
EXPORT_SYMBOL_GPL(synchronize_sched_expedited);

#endif /* #else #ifndef CONFIG_SMP */
+#endif /* CONFIG_SCHED_BFS */
\ No newline at end of file

.

At the end of sched.c it starts exporting the functions and wait!!!! the first function it exports looks like this!

/**
* wait_for_completion: - waits for completion of a task
* @x: holds the state of this particular completion
*
* This waits to be signaled for completion of a specific task. It is NOT
* interruptible and there is no timeout.
*
* See also similar routines (i.e. wait_for_completion_timeout()) with timeout
* and interrupt capability. Also see complete().
*/
void __sched wait_for_completion(struct completion *x)
{
wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE, 0);
}
EXPORT_SYMBOL(wait_for_completion);

So maybe sched isnt exporting any functions anymore after the inclusion of sched_bfs.c into it? i dont know all i know it i didnt touch lowmemmory.c and im sooo close to getting BFS but this is boggling me!! Maybe there is a conflict in kernel options im not aware of? I turned off all c groups and the default scheduler.

I wont paste my .config here nothing annoys me more than that, heres a link to a gist of it on github (just like pastbin for thos not in the know lol) bfs enabled .config and here is my sched.c and my lowmemmorykiller.c! Any help would be awesome there are so many people patching bfs into there androif kernel so im hoping this is a common type of problem

EDIT if i remove the mmc drivers it finishes the compile, but i kind of need these have to sleep now ill experiment more, if neone has any ideas about what the heck is goin on id love to know