Fix for v7.0

Linus,

rv fixes for v7.0

Summary of changes:

- Fix multiple definition of __pcpu_unique_da_mon_this

After refactoring monitors, we used static per-cpu variables with the same names across different per-cpu monitors. This is explicitly disallowed for modules on some architectures (alpha) or if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is enabled (e.g. Fedora's debug kernel). Make sure all those variables have different names to avoid compilation issues.

Please pull the latest trace-rv-7.0-2 tree, which can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
trace-rv-7.0-2

Tag SHA1: a51eb54ed35fd31ef6f245e8d3a9c99dd2b2d3eb Head SHA1: 75f3cf0d1561b0a1cfa97ee35d78ca0118e584d5

Mikhail Gavrilov (1):
rv: Fix multiple definition of __pcpu_unique_da_mon_this

----

 include/rv/da_monitor.h | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
---------------------------
commit 75f3cf0d1561b0a1cfa97ee35d78ca0118e584d5
Author: Mikhail Gavrilov <[email protected]>
Date:   Mon Feb 16 22:27:07 2026 +0500

rv: Fix multiple definition of __pcpu_unique_da_mon_this

The refactoring in commit 30984ccf31b7 ("rv: Refactor da_monitor to minimise macros") replaced per-monitor unique variable names (da_mon_##name) with a fixed name (da_mon_this).

While this works for 'static' variables (each translation unit gets its own copy), DEFINE_PER_CPU internally generates a non-static dummy variable __pcpu_unique_<n> for each per-cpu definition. The requirement for this variable to be unique although static exists for modules on specific architectures (alpha) and if the kernel is built with CONFIG_DEBUG_FORCE_WEAK_PER_CPU (e.g. Fedora's debug kernel).

When multiple per-cpu monitors (e.g. sco and sts) are built-in simultaneously, they all produce the same __pcpu_unique_da_mon_this symbol, causing a link error:

ld: kernel/trace/rv/monitors/sts/sts.o: multiple definition of
`__pcpu_unique_da_mon_this'; kernel/trace/rv/monitors/sco/sco.o: first defined here

Fix this by introducing a DA_MON_NAME macro that expands to a per-monitor unique name (da_mon_<MONITOR_NAME>) via the existing CONCATENATE helper. This restores the uniqueness that was present before the refactoring.

index db11d41bb438..7511f5464c48 100644
@@ -20,6 +20,12 @@
 #include <linux/bug.h>
 #include <linux/sched.h>
 
+/*
+ * Per-cpu variables require a unique name although static in some
+ * configurations (e.g. CONFIG_DEBUG_FORCE_WEAK_PER_CPU or alpha modules).
+ */
+#define DA_MON_NAME CONCATENATE(da_mon_, MONITOR_NAME)
+
 static struct rv_monitor rv_this;
 
 static void react(enum states curr_state, enum events event)

@@ -183,14 +189,14 @@ static inline bool da_event(struct da_monitor *da_mon, struct task_struct *tsk,
 /*
  * global monitor (a single variable)
  */
-static struct da_monitor da_mon_this;
+static struct da_monitor DA_MON_NAME;
 
 /*
  * da_get_monitor - return the global monitor address
  */
 static struct da_monitor *da_get_monitor(void)
 {
-	return &da_mon_this;
+	return &DA_MON_NAME;
 }
 
 /*

@@ -223,14 +229,14 @@ static inline void da_monitor_destroy(void) { }
 /*
  * per-cpu monitor variables
  */
-static DEFINE_PER_CPU(struct da_monitor, da_mon_this);
+static DEFINE_PER_CPU(struct da_monitor, DA_MON_NAME);
 
 /*
  * da_get_monitor - return current CPU monitor address
  */
 static struct da_monitor *da_get_monitor(void)
 {
-	return this_cpu_ptr(&da_mon_this);
+	return this_cpu_ptr(&DA_MON_NAME);
 }
 
 /*

@@ -242,7 +248,7 @@ static void da_monitor_reset_all(void)
 	int cpu;
 
 	for_each_cpu(cpu, cpu_online_mask) {
-		da_mon = per_cpu_ptr(&da_mon_this, cpu);
+		da_mon = per_cpu_ptr(&DA_MON_NAME, cpu);
 		da_monitor_reset(da_mon);
 	}
 }