summaryrefslogtreecommitdiffstats
path: root/lib/kernel_lock.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/kernel_lock.c')
-rw-r--r--lib/kernel_lock.c55
1 files changed, 0 insertions, 55 deletions
diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
index 99b0ae3d51dd..bd2bc5d887b8 100644
--- a/lib/kernel_lock.c
+++ b/lib/kernel_lock.c
@@ -9,61 +9,6 @@
#include <linux/module.h>
#include <linux/kallsyms.h>
-#if defined(CONFIG_PREEMPT) && defined(__smp_processor_id) && \
- defined(CONFIG_DEBUG_PREEMPT)
-
-/*
- * Debugging check.
- */
-unsigned int smp_processor_id(void)
-{
- unsigned long preempt_count = preempt_count();
- int this_cpu = __smp_processor_id();
- cpumask_t this_mask;
-
- if (likely(preempt_count))
- goto out;
-
- if (irqs_disabled())
- goto out;
-
- /*
- * Kernel threads bound to a single CPU can safely use
- * smp_processor_id():
- */
- this_mask = cpumask_of_cpu(this_cpu);
-
- if (cpus_equal(current->cpus_allowed, this_mask))
- goto out;
-
- /*
- * It is valid to assume CPU-locality during early bootup:
- */
- if (system_state != SYSTEM_RUNNING)
- goto out;
-
- /*
- * Avoid recursion:
- */
- preempt_disable();
-
- if (!printk_ratelimit())
- goto out_enable;
-
- printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current->comm, current->pid);
- print_symbol("caller is %s\n", (long)__builtin_return_address(0));
- dump_stack();
-
-out_enable:
- preempt_enable_no_resched();
-out:
- return this_cpu;
-}
-
-EXPORT_SYMBOL(smp_processor_id);
-
-#endif /* PREEMPT && __smp_processor_id && DEBUG_PREEMPT */
-
#ifdef CONFIG_PREEMPT_BKL
/*
* The 'big kernel semaphore'
OpenPOWER on IntegriCloud