diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/lib/smp_processor_id.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/lib/smp_processor_id.c')
-rw-r--r-- | kernel/lib/smp_processor_id.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/kernel/lib/smp_processor_id.c b/kernel/lib/smp_processor_id.c new file mode 100644 index 000000000..11fa43104 --- /dev/null +++ b/kernel/lib/smp_processor_id.c @@ -0,0 +1,65 @@ +/* + * lib/smp_processor_id.c + * + * DEBUG_PREEMPT variant of smp_processor_id(). + */ +#include <linux/export.h> +#include <linux/kallsyms.h> +#include <linux/sched.h> + +notrace static unsigned int check_preemption_disabled(const char *what1, + const char *what2) +{ + int this_cpu = raw_smp_processor_id(); + + if (likely(preempt_count())) + goto out; + + if (irqs_disabled()) + goto out; + + /* + * Kernel threads bound to a single CPU can safely use + * smp_processor_id(): + */ + if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu))) + goto out; + + /* + * It is valid to assume CPU-locality during early bootup: + */ + if (system_state != SYSTEM_RUNNING) + goto out; + + /* + * Avoid recursion: + */ + preempt_disable_notrace(); + + if (!printk_ratelimit()) + goto out_enable; + + printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x %08x] code: %s/%d\n", + what1, what2, preempt_count() - 1, __migrate_disabled(current), + current->comm, current->pid); + + print_symbol("caller is %s\n", (long)__builtin_return_address(0)); + dump_stack(); + +out_enable: + preempt_enable_no_resched_notrace(); +out: + return this_cpu; +} + +notrace unsigned int debug_smp_processor_id(void) +{ + return check_preemption_disabled("smp_processor_id", ""); +} +EXPORT_SYMBOL(debug_smp_processor_id); + +notrace void __this_cpu_preempt_check(const char *op) +{ + check_preemption_disabled("__this_cpu_", op); +} +EXPORT_SYMBOL(__this_cpu_preempt_check); |