Hello,
I'm not a programmer at all, but I tried to compile a new kernel due to
needed realtime capabilities for JACK audio server, though.
I followed mainly this howto
http://ubuntustudio.com/wiki/index.php/Dapper:Vanilla_Kernel_With_Realtime_Preemption
But I ran into problems with the needed rt patch of Ingo Molnar:
http://people.redhat.com/mingo/realtime-preempt/patch-2.6.17-rt8
It failed on the 2.6.17.8 in 1 chunk on the Makefile and 1 chunk of
kernel/sched.c .
Therefore I searched the mentioned first lines, and did it by 'hand' :-(
=================
This is what I changed in Makefile:
=================
EXTRAVERSION = .8-rt8
=================
This is what I did in kernel/sched.c:
=================
4763
4764 /*
4765 * cond_resched_lock() - if a reschedule is pending, drop the
given lock,
4766 * call schedule, and on return reacquire the lock.
4767 *
4768 * This works OK both with and without CONFIG_PREEMPT. We do
strange low-level
4769 * operations here to prevent schedule() from being called twice
(once via
4770 * * spin_unlock(), once by hand).
4771 * */
4772 int __cond_resched_raw_spinlock(raw_spinlock_t *lock)
4773 {
4774 int ret = 0;
4775
4776 if (need_lockbreak_raw(lock)) {
4777 spin_unlock(lock);
4778 cpu_relax();
4779 spin_lock(lock);
4780 ret = 1;
4781 }
4782 if (need_resched()) {
4783 spin_unlock_no_resched(lock);
4784 __cond_resched();
4785 spin_lock(lock);
4786 ret = 1;
4787 }
4788 return ret;
4789 }
4790
4791 EXPORT_SYMBOL(__cond_resched_raw_spinlock);
4792
4793 #ifdef CONFIG_PREEMPT_RT
4794
4795 int __cond_resched_spinlock(spinlock_t *lock)
4796 {
4797 #if (defined(CONFIG_SMP) && defined(CONFIG_PREEMPT)) ||
defined(CONFIG_PREEMPT_RT)
4798 if (lock->break_lock) {
4799 lock->break_lock = 0;
4800 _spin_unlock(lock);
4801 __cond_resched();
4802 _spin_lock(lock);
4803 return 1;
4804 }
4805 #endif
4806 return 0;
4807 }
4808
4809 EXPORT_SYMBOL(__cond_resched_spinlock);
4810
4811 #endif
4812
4813
4814 /*
4815 * Preempt a softirq context if necessary:
4816 */
4817 int __sched cond_resched_softirq(void)
4818 {
4819 #ifndef CONFIG_PREEMPT_RT
4820 BUG_ON(!in_softirq());
4821
4822 if (softirq_need_resched()) {
4823 __local_bh_enable();
4824 __cond_resched();
4825 local_bh_disable();
4826 return 1;
4827 }
4828 #endif
4829 return 0;
4830 }
4831
4832 EXPORT_SYMBOL(cond_resched_softirq);
4833
4834 /*
4835 * Preempt a hardirq context if necessary:
4836 */
4837 int cond_resched_hardirq(void)
4838 {
4839 BUG_ON(!in_irq());
4840
4841 if (hardirq_need_resched()) {
4842 irq_exit();
4843 __cond_resched();
4844 irq_enter();
4845 return 1;
4846 }
4847 return 0;
4848 }
4849
4850 EXPORT_SYMBOL(cond_resched_hardirq);
4851
4852 /*
4853 * Preempt any context:
4854 */
4855 int cond_resched_all(void)
4856 {
4857 if (hardirq_count())
4858 return cond_resched_hardirq();
4859 if (softirq_count())
4860 return cond_resched_softirq();
4861 return cond_resched();
4862 }
4863
4864 EXPORT_SYMBOL(cond_resched_all);
4865
4866 #ifdef CONFIG_PREEMPT_VOLUNTARY
4867
4868 int voluntary_preemption = 1;
4869
4870 EXPORT_SYMBOL(voluntary_preemption);
4871
4872 static int __init voluntary_preempt_setup (char *str)
4873 {
4874 if (!strncmp(str, "off", 3))
4875 voluntary_preemption = 0;
4876 else
4877 get_option(&str, &voluntary_preemption);
4878 if (!voluntary_preemption)
4879 printk("turning off voluntary preemption!\n");
4880
4881 return 1;
4882 }
4883
4884 __setup("voluntary-preempt=", voluntary_preempt_setup);
4885
4886 #endif
4887
4888 /**
4889 * * yield - yield the current processor to other threads.
4890 *
4891 *
4892 * this is a shortcut for kernel-space yielding - it marks the
4893 * thread runnable and calls sys_sched_yield().
4894 */
====================
diff -u format kernel/sched.c
====================
root@ubuntu:/usr/src/linux # diff -u ../../sched.c.old kernel/sched.c
--- ../../sched.c.old 2006-08-12 19:01:20.000000000 +0200
+++ kernel/sched.c 2006-08-12 19:21:09.000000000 +0200
@@ -4767,45 +4767,127 @@
*
* This works OK both with and without CONFIG_PREEMPT. We do strange
low-level
* operations here to prevent schedule() from being called twice (once
via
- * spin_unlock(), once by hand).
- */
-int cond_resched_lock(spinlock_t *lock)
-{
- int ret = 0;
-
- if (need_lockbreak(lock)) {
- spin_unlock(lock);
- cpu_relax();
+ * * spin_unlock(), once by hand).
+ * */
+ int __cond_resched_raw_spinlock(raw_spinlock_t *lock)
+ {
+ int ret = 0;
+
+ if (need_lockbreak_raw(lock)) {
+ spin_unlock(lock);
+ cpu_relax();
+ spin_lock(lock);
ret = 1;
- spin_lock(lock);
+ }
+ if (need_resched()) {
+ spin_unlock_no_resched(lock);
+ __cond_resched();
+ spin_lock(lock);
+ ret = 1;
+ }
+ return ret;
+ }
+
+ EXPORT_SYMBOL(__cond_resched_raw_spinlock);
+
+ #ifdef CONFIG_PREEMPT_RT
+
+ int __cond_resched_spinlock(spinlock_t *lock)
+ {
+ #if (defined(CONFIG_SMP) && defined(CONFIG_PREEMPT)) ||
defined(CONFIG_PREEMPT_RT)
+ if (lock->break_lock) {
+ lock->break_lock = 0;
+ _spin_unlock(lock);
+ __cond_resched();
+ _spin_lock(lock);
+ return 1;
}
- if (need_resched() && __resched_legal(1)) {
- _raw_spin_unlock(lock);
- preempt_enable_no_resched();
- __cond_resched();
- ret = 1;
- spin_lock(lock);
- }
- return ret;
-}
-EXPORT_SYMBOL(cond_resched_lock);
-
-int __sched cond_resched_softirq(void)
-{
- BUG_ON(!in_softirq());
-
- if (need_resched() && __resched_legal(0)) {
- __local_bh_enable();
- __cond_resched();
- local_bh_disable();
+#endif
+ return 0;
+ }
+
+ EXPORT_SYMBOL(__cond_resched_spinlock);
+
+ #endif
+
+
+ /*
+ * Preempt a softirq context if necessary:
+ */
+ int __sched cond_resched_softirq(void)
+ {
+ #ifndef CONFIG_PREEMPT_RT
+ BUG_ON(!in_softirq());
+
+ if (softirq_need_resched()) {
+ __local_bh_enable();
+ __cond_resched();
+ local_bh_disable();
return 1;
}
+ #endif
+ return 0;
+ }
+
+ EXPORT_SYMBOL(cond_resched_softirq);
+
+ /*
+ * Preempt a hardirq context if necessary:
+ */
+ int cond_resched_hardirq(void)
+ {
+ BUG_ON(!in_irq());
+
+ if (hardirq_need_resched()) {
+ irq_exit();
+ __cond_resched();
+ irq_enter();
+ return 1;
+ }
return 0;
-}
-EXPORT_SYMBOL(cond_resched_softirq);
-
-/**
- * yield - yield the current processor to other threads.
+ }
+
+ EXPORT_SYMBOL(cond_resched_hardirq);
+
+ /*
+ * Preempt any context:
+ */
+ int cond_resched_all(void)
+ {
+ if (hardirq_count())
+ return cond_resched_hardirq();
+ if (softirq_count())
+ return cond_resched_softirq();
+ return cond_resched();
+ }
+
+ EXPORT_SYMBOL(cond_resched_all);
+
+ #ifdef CONFIG_PREEMPT_VOLUNTARY
+
+ int voluntary_preemption = 1;
+
+ EXPORT_SYMBOL(voluntary_preemption);
+
+ static int __init voluntary_preempt_setup (char *str)
+ {
+ if (!strncmp(str, "off", 3))
+ voluntary_preemption = 0;
+ else
+ get_option(&str, &voluntary_preemption);
+ if (!voluntary_preemption)
+ printk("turning off voluntary preemption!\n");
+
+ return 1;
+ }
+
+ __setup("voluntary-preempt=", voluntary_preempt_setup);
+
+ #endif
+
+ /**
+ * * yield - yield the current processor to other threads.
+ *
*
* this is a shortcut for kernel-space yielding - it marks the
* thread runnable and calls sys_sched_yield().
==================
Now I get this errors on compiling the modules:
==================
make[1]: Entering directory `/usr/src/modules/realtime-lsm'
/usr/bin/make -w -f debian/rules kdist_clean kdist_config binary-modules
make[2]: Entering directory `/usr/src/modules/realtime-lsm'
dh_clean
make COMMONCAP=none clean
make[3]: Entering directory `/usr/src/modules/realtime-lsm'
rm -f *.ko *.o none
rm -f *.mod.* .*.cmd
make[3]: Leaving directory `/usr/src/modules/realtime-lsm'
/usr/bin/gcc-4.0
for templ
in /usr/src/modules/realtime-lsm/debian/realtime-lsm-module-_KVERS_.postinst /usr/src/modules/realtime-lsm/debian/realtime-lsm-module-_KVERS_.postinst.modules.in;
do \
cp $templ `echo $templ | sed -e 's/_KVERS_/2.6.17.8-rt8/g'` ; \
done
for templ in `ls debian/*.modules.in` ; do \
test -e ${templ%.modules.in}.backup || cp ${templ%.modules.in}
${templ%.modules.in}.backup 2>/dev/null || true; \
sed -e 's/##KVERS##/2.6.17.8-rt8/g ;s/#KVERS#/2.6.17.8-rt8/g ;
s/_KVERS_/2.6.17.8-rt8/g ; s/##KDREV##/1/g ; s/#KDREV#/1/g ;
s/_KDREV_/1/g' < $templ > ${templ%.modules.in}; \
done
dh_testdir
dh_testroot
dh_clean -k
make KERNEL_DIR=/usr/src/linux MODVERSIONS=detect
KERNEL=linux-2.6.17.8-rt8 COMMONCAP=none
make[3]: Entering directory `/usr/src/modules/realtime-lsm'
CONFIG_SECURITY_CAPABILITIES=m
make CC=gcc-4.0 modules -C /usr/src/linux
SUBDIRS=/usr/src/modules/realtime-lsm
make[4]: Entering directory `/usr/src/linux-2.6.17-rt8'
CC [M] /usr/src/modules/realtime-lsm/realcap.o
/usr/src/modules/realtime-lsm/realcap.c:1: warning: -ffunction-sections
disabled; it makes profiling impossible
/usr/src/modules/realtime-lsm/realcap.c:36: error: syntax error before
string constant
/usr/src/modules/realtime-lsm/realcap.c:36: warning: type defaults
to 'int' in declaration of 'MODULE_PARM'
/usr/src/modules/realtime-lsm/realcap.c:36: warning: function
declaration isn't a prototype
/usr/src/modules/realtime-lsm/realcap.c:36: warning: data definition has
no type or storage class
/usr/src/modules/realtime-lsm/realcap.c:40: error: syntax error before
string constant
/usr/src/modules/realtime-lsm/realcap.c:40: warning: type defaults
to 'int' in declaration of 'MODULE_PARM'
/usr/src/modules/realtime-lsm/realcap.c:40: warning: function
declaration isn't a prototype
/usr/src/modules/realtime-lsm/realcap.c:40: warning: data definition has
no type or storage class
/usr/src/modules/realtime-lsm/realcap.c:44: error: syntax error before
string constant
/usr/src/modules/realtime-lsm/realcap.c:44: warning: type defaults
to 'int' in declaration of 'MODULE_PARM'
/usr/src/modules/realtime-lsm/realcap.c:44: warning: function
declaration isn't a prototype
/usr/src/modules/realtime-lsm/realcap.c:44: warning: data definition has
no type or storage class
/usr/src/modules/realtime-lsm/realcap.c:48: error: syntax error before
string constant
/usr/src/modules/realtime-lsm/realcap.c:48: warning: type defaults
to 'int' in declaration of 'MODULE_PARM'
/usr/src/modules/realtime-lsm/realcap.c:48: warning: function
declaration isn't a prototype
/usr/src/modules/realtime-lsm/realcap.c:48: warning: data definition has
no type or storage class
make[5]: *** [/usr/src/modules/realtime-lsm/realcap.o] Error 1
make[4]: *** [_module_/usr/src/modules/realtime-lsm] Error 2
make[4]: Leaving directory `/usr/src/linux-2.6.17-rt8'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/usr/src/modules/realtime-lsm'
make[2]: *** [binary-modules] Error 2
make[2]: Leaving directory `/usr/src/modules/realtime-lsm'
make[1]: *** [kdist_build] Error 2
make[1]: Leaving directory `/usr/src/modules/realtime-lsm'
Module /usr/src/modules/realtime-lsm failed.
Hit return to Continue
[...]
make[1]: Entering directory `/usr/src/modules/misdn'
/usr/bin/make -w -f debian/rules binary-modules
make[2]: Entering directory `/usr/src/modules/misdn'
sed -e 's/@@Kernel\-Version@@/2.6.17.8-rt8.8-rt8/' \
debian/control.in > debian/control
dh_testdir
dh_testroot
dh_clean -k
dh_clean: Compatibility levels before 4 are deprecated.
echo "kpkg:Kernel-Version=2.6.17.8-rt8.8-rt8" > \
debian/misdn-kernel-modules-2.6.17.8-rt8.8-rt8.substvars
/usr/bin/make -C /usr/src/linux M=/usr/src/modules/misdn modules
make[3]: Entering directory `/usr/src/linux-2.6.17-rt8'
CC [M] /usr/src/modules/misdn/avm_fritz.o
/usr/src/modules/misdn/avm_fritz.c:1: warning: -ffunction-sections
disabled; it makes profiling impossible
In file included from /usr/src/modules/misdn/avm_fritz.c:24:
/usr/src/modules/misdn/helper.h: In function 'alloc_stack_skb':
/usr/src/modules/misdn/helper.h:60: warning: format '%d' expects
type 'int', but argument 3 has type 'size_t'
/usr/src/modules/misdn/helper.h:60: warning: format '%d' expects
type 'int', but argument 4 has type 'size_t'
/usr/src/modules/misdn/avm_fritz.c: At top level:
/usr/src/modules/misdn/avm_fritz.c:1013: error: syntax error before
string constant
/usr/src/modules/misdn/avm_fritz.c:1013: warning: type defaults to 'int'
in declaration of 'MODULE_PARM'
/usr/src/modules/misdn/avm_fritz.c:1013: warning: function declaration
isn't a prototype
/usr/src/modules/misdn/avm_fritz.c:1013: warning: data definition has no
type or storage class
/usr/src/modules/misdn/avm_fritz.c:1014: error: syntax error before
string constant
/usr/src/modules/misdn/avm_fritz.c:1014: warning: type defaults to 'int'
in declaration of 'MODULE_PARM'
/usr/src/modules/misdn/avm_fritz.c:1014: warning: function declaration
isn't a prototype
/usr/src/modules/misdn/avm_fritz.c:1014: warning: data definition has no
type or storage class
/usr/src/modules/misdn/avm_fritz.c:1015: error: syntax error before
string constant
/usr/src/modules/misdn/avm_fritz.c:1015: warning: type defaults to 'int'
in declaration of 'MODULE_PARM'
/usr/src/modules/misdn/avm_fritz.c:1015: warning: function declaration
isn't a prototype
/usr/src/modules/misdn/avm_fritz.c:1015: warning: data definition has no
type or storage class
make[4]: *** [/usr/src/modules/misdn/avm_fritz.o] Error 1
make[3]: *** [_module_/usr/src/modules/misdn] Error 2
make[3]: Leaving directory `/usr/src/linux-2.6.17-rt8'
make[2]: *** [binary-modules] Error 2
make[2]: Leaving directory `/usr/src/modules/misdn'
make[1]: *** [kdist_image] Error 2
make[1]: Leaving directory `/usr/src/modules/misdn'
Module /usr/src/modules/misdn failed.
Hit return to Continue
=================
=================
I got in almost every line this warning:
warning: -ffunction-sections disabled; it makes profiling impossible
I think that does not affect the kernel ?
Can someone help me to get the realtime-lsm compiled on the new 2.6.17.8
kernel, please?
Kind regards
Gerhard Gaußling
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