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authorMichal Simek <monstr@monstr.eu>2009-12-10 12:07:02 +0100
committerMichal Simek <monstr@monstr.eu>2009-12-14 08:40:09 +0100
commitbf2d809668907c69b554459764b36584e4d57e4a (patch)
tree8f3e16925a34645ffd14e6d171937b37a06fba41 /arch/microblaze/kernel/setup.c
parent519e9f417388ba055b7604db5f4f492f7c84f427 (diff)
microblaze: Lockdep support
Microblaze needs to do lock_init very soon because MMU init calls lock functions. Here is the explanation from Peter Zijlstra why we have to enable __ARCH_WANTS_INTERRUPTS_ON_CTSW. "So we schedule while holding rq->lock (for obvious reasons), but since lockdep tracks held locks per tasks, we need to transfer the held state from the prev to the next task. We do this by explicity calling spin_release(&rq->lock) in context_switch() right before switch_to(), and calling spin_acquire(&rq->lock) in finish_task_switch()->finish_lock_switch(). Now, for some reason lockdep thinks that interrupts got enabled over the context switch (git grep __ARCH_WANTS_INTERRUPTS_ON_CTSW arch/microblaze doesn't seem to turn up anything). Clearly trying to acquire the rq->lock with interrupts enabled is a bad idea and lockdep warns you about this." Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/setup.c')
-rw-r--r--arch/microblaze/kernel/setup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c
index 367ad330148..acd70fe30a7 100644
--- a/arch/microblaze/kernel/setup.c
+++ b/arch/microblaze/kernel/setup.c
@@ -131,6 +131,8 @@ void __init machine_early_init(const char *cmdline, unsigned int ram,
strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
#endif
+ lockdep_init();
+
/* initialize device tree for usage in early_printk */
early_init_devtree((void *)_fdt_start);