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sched_ext: Convert scx_dump_state() spinlock to raw spinlock

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The scx_dump_state() function uses a regular spinlock to serialize
access. In a subsequent patch, this function will be called while
holding scx_sched_lock, which is a raw spinlock, creating a lock
nesting violation.

Convert the dump_lock to a raw spinlock and use the guard macro for
cleaner lock management.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
This commit is contained in:
Tejun Heo 2026-03-06 07:58:04 -10:00
parent cde94c032b
commit eff782fddb
1 changed files with 2 additions and 5 deletions
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7
kernel/sched/ext.c
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@ -5220,7 +5220,7 @@ static void scx_dump_task(struct seq_buf *s, struct scx_dump_ctx *dctx,
static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
{
static DEFINE_SPINLOCK(dump_lock);
static DEFINE_RAW_SPINLOCK(dump_lock);
static const char trunc_marker[] = "\n\n~~~~ TRUNCATED ~~~~\n";
struct scx_sched *sch = scx_root;
struct scx_dump_ctx dctx = {
@ -5232,11 +5232,10 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
};
struct seq_buf s;
struct scx_event_stats events;
unsigned long flags;
char *buf;
int cpu;
spin_lock_irqsave(&dump_lock, flags);
guard(raw_spinlock_irqsave)(&dump_lock);
seq_buf_init(&s, ei->dump, dump_len);
@ -5361,8 +5360,6 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker))
memcpy(ei->dump + dump_len - sizeof(trunc_marker),
trunc_marker, sizeof(trunc_marker));
spin_unlock_irqrestore(&dump_lock, flags);
}
static void scx_error_irq_workfn(struct irq_work *irq_work)