percpu: add preemption checks to __this_cpu ops
We define a check function in order to avoid trouble with the include
files. Then the higher level __this_cpu macros are modified to invoke
the preemption check.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Christoph Lameter <cl@linux.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Tested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 04abe53..1afec32 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -7,7 +7,8 @@
#include <linux/kallsyms.h>
#include <linux/sched.h>
-notrace unsigned int debug_smp_processor_id(void)
+notrace static unsigned int check_preemption_disabled(const char *what1,
+ const char *what2)
{
int this_cpu = raw_smp_processor_id();
@@ -38,9 +39,9 @@
if (!printk_ratelimit())
goto out_enable;
- printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] "
- "code: %s/%d\n",
- preempt_count() - 1, current->comm, current->pid);
+ printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n",
+ what1, what2, preempt_count() - 1, current->comm, current->pid);
+
print_symbol("caller is %s\n", (long)__builtin_return_address(0));
dump_stack();
@@ -50,5 +51,14 @@
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);