[tip: perf/core] perf: Move and enhance has_extended_regs() for arch-specific use

[tip-bot2 for Kan Liang]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     05fe8825796e6b5557656c6c984486f0e66154fe
Gitweb:        https://git.kernel.org/tip/05fe8825796e6b5557656c6c984486f0e66154fe
Author:        Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
AuthorDate:    Mon, 24 Aug 2026 16:27:16 +08:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 02 Sep 2026 13:10:42 +02:00

perf: Move and enhance has_extended_regs() for arch-specific use

Move has_extended_regs() to include/linux/perf_event.h so it can be used
by arch-specific code.

While moving it, enhance the check logic and rename it to
event_has_extended_regs() to match existing perf event helper naming.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260824082731.1013973-9-dapeng1.mi@xxxxxxxxxxxxxxx
---
 include/linux/perf_event.h | 10 ++++++++++
 kernel/events/core.c       |  8 +-------
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 5842552..264785a 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1534,6 +1534,16 @@ perf_event__output_id_sample(struct perf_event *event,
 extern void
 perf_log_lost_samples(struct perf_event *event, u64 lost);
 
+static inline bool event_has_extended_regs(struct perf_event *event)
+{
+	struct perf_event_attr *attr = &event->attr;
+
+	return ((attr->sample_type & PERF_SAMPLE_REGS_USER) &&
+		(attr->sample_regs_user & PERF_REG_EXTENDED_MASK)) ||
+	       ((attr->sample_type & PERF_SAMPLE_REGS_INTR) &&
+		(attr->sample_regs_intr & PERF_REG_EXTENDED_MASK));
+}
+
 static inline bool event_has_any_exclude_flag(struct perf_event *event)
 {
 	struct perf_event_attr *attr = &event->attr;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c84340e..5a0ae02 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -13127,12 +13127,6 @@ int perf_pmu_unregister(struct pmu *pmu)
 }
 EXPORT_SYMBOL_GPL(perf_pmu_unregister);
 
-static inline bool has_extended_regs(struct perf_event *event)
-{
-	return (event->attr.sample_regs_user & PERF_REG_EXTENDED_MASK) ||
-	       (event->attr.sample_regs_intr & PERF_REG_EXTENDED_MASK);
-}
-
 static int perf_try_init_event(struct pmu *pmu, struct perf_event *event)
 {
 	struct perf_event_context *ctx = NULL;
@@ -13167,7 +13161,7 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event)
 		goto err_pmu;
 
 	if (!(pmu->capabilities & PERF_PMU_CAP_EXTENDED_REGS) &&
-	    has_extended_regs(event)) {
+	    event_has_extended_regs(event)) {
 		ret = -EOPNOTSUPP;
 		goto err_destroy;
 	}