[PATCH v2 07/14] sched_ext: Make scx_exit() and scx_vexit() return bool

Tejun Heo
2025-11-10T20:56:45Z

Make scx_exit() and scx_vexit() return bool indicating whether the calling
thread successfully claimed the exit. This will be used by the abort mechanism
added in a later patch.

Cc: Dan Schatzberg <schatzberg.dan@gmail.com>
Cc: Emil Tsalapatis <etsal@meta.com>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
kernel/sched/ext.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 8e4619b4f832..600918095245 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -174,18 +174,21 @@ MODULE_PARM_DESC(slice_bypass_us, "bypass slice in microseconds, applied on [un]
static void process_ddsp_deferred_locals(struct rq *rq);
static u32 reenq_local(struct rq *rq);
static void scx_kick_cpu(struct scx_sched *sch, s32 cpu, u64 flags);
-static void scx_vexit(struct scx_sched *sch, enum scx_exit_kind kind,
+static bool scx_vexit(struct scx_sched *sch, enum scx_exit_kind kind,
s64 exit_code, const char *fmt, va_list args);

-static __printf(4, 5) void scx_exit(struct scx_sched *sch,
+static __printf(4, 5) bool scx_exit(struct scx_sched *sch,
enum scx_exit_kind kind, s64 exit_code,
const char *fmt, ...)
{
va_list args;
+ bool ret;

va_start(args, fmt);
- scx_vexit(sch, kind, exit_code, fmt, args);
+ ret = scx_vexit(sch, kind, exit_code, fmt, args);
va_end(args);
+
+ return ret;
}

#define scx_error(sch, fmt, args...) scx_exit((sch), SCX_EXIT_ERROR, 0, fmt, ##args)
@@ -4396,14 +4399,14 @@ static void scx_error_irq_workfn(struct irq_work *irq_work)
kthread_queue_work(sch->helper, &sch->disable_work);
}

-static void scx_vexit(struct scx_sched *sch,
+static bool scx_vexit(struct scx_sched *sch,
enum scx_exit_kind kind, s64 exit_code,
const char *fmt, va_list args)
{
struct scx_exit_info *ei = sch->exit_info;

if (!scx_claim_exit(sch, kind))
- return;
+ return false;

ei->exit_code = exit_code;
#ifdef CONFIG_STACKTRACE
@@ -4420,6 +4423,7 @@ static void scx_vexit(struct scx_sched *sch,
ei->reason = scx_exit_reason(ei->kind);

irq_work_queue(&sch->error_irq_work);
+ return true;
}

static int alloc_kick_syncs(void)
--
2.51.2