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SubjectRe: rtmutex assert failure (was [Patch] restore the RCU callback...)
On 8/26/06, hui Bill Huey <> wrote:

> Stop using icecream or anything that might to any kind of binary object
> caching or header analysis to minimize compiles during the build. Make sure
> you're really cleaning the entire kernel directory before each build. Make
> sure it'a full build for starters.


> Throw a #error in the __put_task_struct_inline(), not the alternative
> __put_task_struct(). It should bark at compile time and fail to compile
> kernel/fork.c


void __put_task_struct_inline(struct task_struct *tsk)
#error Boo, you can't do this.


[rcrocomb@spanky test_2.6.17-rt8]$ make clean ; make -j4 > /dev/null
CLEAN /home/rcrocomb/kernel/test_2.6.17-rt8
CLEAN arch/x86_64/ia32
CLEAN init
CLEAN .tmp_versions
kernel/fork.c:134:6: error: #error Boo, you can't do this.
make[1]: *** [kernel/fork.o] Error 1

> The function __put_task_struct() should never show up a stack trace
> EVER. That function has been rename under all things CONFIG_PREEMPT_RT
> under my addendum patches. That's why I'm starting to think it's your
> build environment or you're miss applying the patches.

from sched.h:

static inline void put_task_struct(struct task_struct *t)
if (atomic_dec_and_test(&t->usage))

but is it used?

[rcrocomb@spanky test_2.6.17-rt8]$ find ./ -name \*.c -print0 | xargs
-0 grep -l "put_task_struct(" | wc -l

Yes it is. Also, beginning at line 292 in what I call t6.diff (the
most recent URL, I believe):


+ * We dont want to do complex work from the scheduler with preemption
+ * disabled, therefore we delay the work to a per-CPU worker thread.
+ */
+void fastcall __put_task_struct(struct task_struct *task)
+ struct list_head *head;
+ head = &get_cpu_var(delayed_put_task_struct_list);
+ list_add_tail(&task->delayed_drop, head);
+ _wake_cpu_desched_task();
+ put_cpu_var(delayed_put_task_struct_list);

So I think you're mistaken. Patch is applied like this:

[rcrocomb@spanky test_2.6.17-rt8]$ patch -p0 < ../patches/t6.diff
patching file arch/x86_64/kernel/smp.c
patching file arch/x86_64/mm/numa.c
patching file fs/jbd/journal.c
patching file include/linux/hardirq.h
patching file include/linux/init_task.h
patching file include/linux/sched.h
patching file include/linux/seqlock.h
Hunk #1 succeeded at 1 with fuzz 1.
patching file kernel/exit.c
patching file kernel/fork.c
patching file kernel/panic.c
patching file kernel/printk.c
patching file kernel/rtmutex.c
patching file kernel/sched.c

Note that I've posted the sysrq stuff at:

Sorry about screwing up your name: I turned 'hui' into your last name somehow.

Robert Crocombe
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