[PATCH] irqlock patch 2.5.27-H6

 - init thread needs to have preempt_count of 1 until sched_init().
   (William Lee Irwin III)
 - clean up the irq-mask macros. (Linus)
 - add barrier() to irq_enter() and irq_exit(). (based on Oleg Nesterov's
   comment.)
 - move the irqs-off check into preempt_schedule() and remove
   CONFIG_DEBUG_IRQ_SCHEDULE.
 - remove spin_unlock_no_resched() and comment the affected places more
   agressively.
 - slab.c needs to spin_unlock_no_resched(), instead of spin_unlock(). (It
   also has to check for preemption in the right spot.) This should fix
   the memory corruption.
 - irq_exit() needs to run softirqs if interrupts not active - in the
   previous patch it ran them when preempt_count() was 0, which is
   incorrect.
 - spinlock macros are updated to enable preemption after enabling
   interrupts. Besides avoiding false positive warnings, this also
 - fork.c has to call scheduler_tick() with preemption disabled -
   otherwise scheduler_tick()'s spin_unlock can preempt!
 - irqs_disabled() macro introduced.
 - [ all other local_irq_enable() or sti instances conditional on
     CONFIG_DEBUG_IRQ_SCHEDULE are to fix false positive warnings. ]
 - fix buggy in_softirq(). Fortunately the bug made the test broader,
   which didnt result in algorithmical breakage, just suboptimal
   performance.
 - move do_softirq() processing into irq_exit() => this also fixes the
   softirq processing bugs present in apic.c IRQ handlers that did not
   test for softirqs after irq_exit().
 - simplify local_bh_enable().

1 files changed, 1 insertions, 4 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index 107d4409a926..cde52fee66a4 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -62,10 +62,7 @@ void __buffer_error(char *file, int line)
 	printk("buffer layer error at %s:%d\n", file, line);
 #ifdef CONFIG_X86
 	printk("Pass this trace through ksymoops for reporting\n");
-	{
-		extern void show_stack(long *esp);
-		show_stack(0);
-	}
+	show_stack(0);
 #endif
 }
 EXPORT_SYMBOL(__buffer_error);