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[PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs

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It seems ppc64 wants to lock mutexes in early bootup code, with interrupts
disabled, and they expect interrupts to stay disabled, else they crash.

Work around this bug by making mutex debugging variants save/restore irq
flags.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-06-26 00:24:31 -07:00 • committed by Linus Torvalds
parent 20c5426f81
commit 1fb00c6cbd
4 changed files with 27 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

12
kernel/mutex-debug.c
View file

@ -153,13 +153,13 @@ next:
continue;
count++;
cursor = curr->next;
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
printk("\n#%03d: ", count);
printk_lock(lock, filter ? 0 : 1);
goto next;
}
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
printk("\n");
}
@ -316,7 +316,7 @@ void mutex_debug_check_no_locks_held(struct task_struct *task)
continue;
list_del_init(curr);
DEBUG_OFF();
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
printk("BUG: %s/%d, lock held at task exit time!\n",
task->comm, task->pid);
@ -325,7 +325,7 @@ void mutex_debug_check_no_locks_held(struct task_struct *task)
printk("exiting task is not even the owner??\n");
return;
}
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
}
/*
@ -352,7 +352,7 @@ void mutex_debug_check_no_locks_freed(const void *from, unsigned long len)
continue;
list_del_init(curr);
DEBUG_OFF();
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
printk("BUG: %s/%d, active lock [%p(%p-%p)] freed!\n",
current->comm, current->pid, lock, from, to);
@ -362,7 +362,7 @@ void mutex_debug_check_no_locks_freed(const void *from, unsigned long len)
printk("freeing task is not even the owner??\n");
return;
}
debug_spin_lock_restore(&debug_mutex_lock, flags);
debug_spin_unlock_restore(&debug_mutex_lock, flags);
}
/*