diff options
author | Thomas Gleixner <tglx@tglx.tec.linutronix.de> | 2005-06-26 23:20:36 +0200 |
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committer | Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-06-26 23:20:36 +0200 |
commit | 7ca6448dbfb398bba36eda3c01bc14b86c3675be (patch) | |
tree | 82d934ebf07f22a2c64c3b6d82ec24082878b43a /lib/smp_processor_id.c | |
parent | f1f67a9874f1a4bba1adff6d694aa52e5f52ff1a (diff) | |
parent | 7d681b23d6cc14a8c026ea6756242cb522cbbcae (diff) |
Merge with rsync://fileserver/linux
Update to Linus latest
Diffstat (limited to 'lib/smp_processor_id.c')
-rw-r--r-- | lib/smp_processor_id.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c new file mode 100644 index 00000000000..42c08ef828c --- /dev/null +++ b/lib/smp_processor_id.c @@ -0,0 +1,55 @@ +/* + * lib/smp_processor_id.c + * + * DEBUG_PREEMPT variant of smp_processor_id(). + */ +#include <linux/module.h> +#include <linux/kallsyms.h> + +unsigned int debug_smp_processor_id(void) +{ + unsigned long preempt_count = preempt_count(); + int this_cpu = raw_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(debug_smp_processor_id); + |