Guess not. I tried 2.6.11 patched with 2.6.12-rc2 and realtime-preempt-2.6.12-rc2-RT-V0.7.45-01 with full preemption, the lowest preemption setting, and with the desktop setting but nothing worked. Any ideas? Thanks! -thewade Error output-------- CONFIG_PREEMPT_RT=y CC init/main.o In file included from include/linux/rwsem.h:38, from include/linux/kobject.h:24, from include/linux/module.h:19, from init/main.c:16: include/asm/rwsem.h:55: error: redefinition of `struct rw_semaphore\' In file included from include/linux/rwsem.h:38, from include/linux/kobject.h:24, from include/linux/module.h:19, from init/main.c:16: include/asm/rwsem.h:79:1: warning: \"__RWSEM_INITIALIZER\" redefined In file included from include/linux/spinlock.h:16, from include/linux/capability.h:45, from include/linux/sched.h:7, from include/linux/module.h:10, from init/main.c:16: include/linux/rt_lock.h:295:1: warning: this is the location of the previous definition In file included from include/linux/rwsem.h:38, from include/linux/kobject.h:24, from include/linux/module.h:19, from init/main.c:16: include/asm/rwsem.h:83:1: warning: \"DECLARE_RWSEM\" redefined In file included from include/linux/spinlock.h:16, from include/linux/capability.h:45, from include/linux/sched.h:7, from include/linux/module.h:10, from init/main.c:16: include/linux/rt_lock.h:298:1: warning: this is the location of the previous definition include/asm/rwsem.h:86: error: syntax error before \"do\" In file included from include/linux/kobject.h:24, from include/linux/module.h:19, from init/main.c:16: include/linux/rwsem.h: In function `compat_down_read\': include/linux/rwsem.h:56: warning: passing arg 1 of `__down_read\' from incompatible pointer type include/linux/rwsem.h: In function `compat_down_read_trylock\': include/linux/rwsem.h:67: warning: passing arg 1 of `__down_read_trylock\' from incompatible pointer type include/linux/rwsem.h: In function `compat_down_write\': include/linux/rwsem.h:79: warning: passing arg 1 of `__down_write\' from incompatible pointer type include/linux/rwsem.h: In function `compat_down_write_trylock\': include/linux/rwsem.h:90: warning: passing arg 1 of `__down_write_trylock\' from incompatible pointer type include/linux/rwsem.h: In function `compat_up_read\': include/linux/rwsem.h:101: warning: passing arg 1 of `__up_read\' from incompatible pointer type include/linux/rwsem.h: In function `compat_up_write\': include/linux/rwsem.h:111: warning: passing arg 1 of `__up_write\' from incompatible pointer type include/linux/rwsem.h: In function `compat_downgrade_write\': include/linux/rwsem.h:121: warning: passing arg 1 of `__downgrade_write\' from incompatible pointer type In file included from include/linux/proc_fs.h:6, from init/main.c:17: include/linux/fs.h: In function `lock_super\': include/linux/fs.h:828: warning: implicit declaration of function `compat_down\' include/linux/fs.h: In function `unlock_super\': include/linux/fs.h:833: warning: implicit declaration of function `compat_up\' make[1]: *** [init/main.o] Error 1 make: *** [init] Error 2 CONFIG_PREEMPT_DESKTOP=y CC arch/x86_64/kernel/init_task.o arch/x86_64/kernel/init_task.c:17: warning: implicit declaration of function `__RWSEM_INITIALIZER\' arch/x86_64/kernel/init_task.c:17: warning: missing braces around initializer arch/x86_64/kernel/init_task.c:17: warning: (near initialization for `init_mm.mmap_sem\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmap_sem.activity\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmap_sem\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.page_table_lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmlist\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.cpu_vm_mask\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.users\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait.lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait.task_list\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.ctx_lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx\') make[1]: *** [arch/x86_64/kernel/init_task.o] Error 1 make: *** [arch/x86_64/kernel] Error 2 CONFIG_PREEMPT_VOLUNTARY=y CC arch/x86_64/kernel/init_task.o arch/x86_64/kernel/init_task.c:17: warning: implicit declaration of function `__RWSEM_INITIALIZER\' arch/x86_64/kernel/init_task.c:17: warning: missing braces around initializer arch/x86_64/kernel/init_task.c:17: warning: (near initialization for `init_mm.mmap_sem\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmap_sem.activity\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmap_sem\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.page_table_lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.mmlist\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.cpu_vm_mask\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.users\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait.lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait.task_list\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.wait\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx.ctx_lock\') arch/x86_64/kernel/init_task.c:17: error: initializer element is not constant arch/x86_64/kernel/init_task.c:17: error: (near initialization for `init_mm.default_kioctx\') make[1]: *** [arch/x86_64/kernel/init_task.o] Error 1 make: *** [arch/x86_64/kernel] Error 2