x86, bts: turn BUG_ON into WARN_ON_ONCE

Impact: make the ds code more debuggable

Turn BUG_ON's into WARN_ON_ONCE.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 5 insertions, 4 deletions

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 19a8c2c0389f..095306988667 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -452,7 +452,7 @@ struct pebs_tracer *ds_request_pebs(struct task_struct *task,
 
 static void ds_release(struct ds_tracer *tracer, enum ds_qualifier qual)
 {
-        BUG_ON(tracer->context->owner[qual] != tracer);
+        WARN_ON_ONCE(tracer->context->owner[qual] != tracer);
         tracer->context->owner[qual] = NULL;
 
         put_tracer(tracer->context->task);
@@ -774,7 +774,7 @@ ds_configure(const struct ds_configuration *cfg)
 
         printk(KERN_INFO "DS available\n");
 
-        BUG_ON(MAX_SIZEOF_DS < ds_cfg.sizeof_ds);
+        WARN_ON_ONCE(MAX_SIZEOF_DS < ds_cfg.sizeof_ds);
 }
 
 void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 2c8ec1ba75e6..b2998fe1166b 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -878,7 +878,8 @@ static int ptrace_bts_write_record(struct task_struct *child,
 {
         unsigned char bts_record[BTS_MAX_RECORD_SIZE];
 
-        BUG_ON(BTS_MAX_RECORD_SIZE < bts_cfg.sizeof_bts);
+        if (BTS_MAX_RECORD_SIZE < bts_cfg.sizeof_bts)
+                return -EOVERFLOW;
 
         memset(bts_record, 0, bts_cfg.sizeof_bts);
         switch (in->qualifier) {
@@ -1133,7 +1134,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 
                 ret = ds_get_bts_index(child->bts, &size);
                 if (ret == 0) {
-                        BUG_ON(size != (int) size);
+                        WARN_ON_ONCE(size != (int) size);
                         ret = (int) size;
                 }
                 break;