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Message-ID: <20100524220428.GA17771@aepfle.de>
Date: Tue, 25 May 2010 00:04:28 +0200
From: Olaf Hering <olaf@...fle.de>
To: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: [PATCH RT] fix undefined references to kernel_sem
protect kernel_sem access with CONFIG_LOCK_KERNEL
lib/kernel_lock.c is compiled conditionally.
Signed-off-by: Olaf Hering <olaf@...fle.de>
---
init/main.c | 4 ++++
kernel/lockdep.c | 2 ++
2 files changed, 6 insertions(+)
--- linux-2.6.33-rt.orig/init/main.c
+++ linux-2.6.33-rt/init/main.c
@@ -629,9 +629,13 @@ asmlinkage void __init start_kernel(void
* the lockdep state, so release the one known lock and
* acquire it again after the self-test is done.
*/
+#ifdef CONFIG_LOCK_KERNEL
mutex_release(&kernel_sem.dep_map, 1, _THIS_IP_);
+#endif
locking_selftest();
+#ifdef CONFIG_LOCK_KERNEL
mutex_acquire(&kernel_sem.dep_map, 0, 0, _THIS_IP_);
+#endif
}
#ifdef CONFIG_BLK_DEV_INITRD
--- linux-2.6.33-rt.orig/kernel/lockdep.c
+++ linux-2.6.33-rt/kernel/lockdep.c
@@ -3608,8 +3608,10 @@ void lockdep_init(void)
for (i = 0; i < CHAINHASH_SIZE; i++)
INIT_LIST_HEAD(chainhash_table + i);
+#ifdef CONFIG_LOCK_KERNEL
/* Hack alert ! */
lockdep_set_novalidate_class(&kernel_sem);
+#endif
lockdep_initialized = 1;
}
--
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