Re: [PATCH v4 1/4] i915: Move list_count() to list.h for broader use

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On Wed, Nov 23, 2022 at 04:48:58PM +0200, Andy Shevchenko wrote:
Some of the existing users, and definitely will be new ones, want to
count existing nodes in the list. Provide a generic API for that by
moving code from i915 to list.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>


Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>

thanks
Lucas De Marchi

---
v4: fixed prototype when converting to static inline
v3: added tag (Jani), changed to be static inline (Mike)
v2: dropped the duplicate code in i915 (LKP)
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 13 +------------
include/linux/list.h                      | 15 +++++++++++++++
2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index c33e0d72d670..b96c8217743c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -2094,17 +2094,6 @@ static void print_request_ring(struct drm_printer *m, struct i915_request *rq)
	}
}

-static unsigned long list_count(struct list_head *list)
-{
-	struct list_head *pos;
-	unsigned long count = 0;
-
-	list_for_each(pos, list)
-		count++;
-
-	return count;
-}
-
static unsigned long read_ul(void *p, size_t x)
{
	return *(unsigned long *)(p + x);
@@ -2279,7 +2268,7 @@ void intel_engine_dump(struct intel_engine_cs *engine,
	spin_lock_irqsave(&engine->sched_engine->lock, flags);
	engine_dump_active_requests(engine, m);

-	drm_printf(m, "\tOn hold?: %lu\n",
+	drm_printf(m, "\tOn hold?: %zu\n",
		   list_count(&engine->sched_engine->hold));
	spin_unlock_irqrestore(&engine->sched_engine->lock, flags);

diff --git a/include/linux/list.h b/include/linux/list.h
index 61762054b4be..632a298c7018 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -655,6 +655,21 @@ static inline void list_splice_tail_init(struct list_head *list,
	     !list_is_head(pos, (head)); \
	     pos = n, n = pos->prev)

+/**
+ * list_count - count nodes in the list
+ * @head:	the head for your list.
+ */
+static inline size_t list_count(struct list_head *head)
+{
+	struct list_head *pos;
+	size_t count = 0;
+
+	list_for_each(pos, head)
+		count++;
+
+	return count;
+}
+
/**
 * list_entry_is_head - test if the entry points to the head of the list
 * @pos:	the type * to cursor
--
2.35.1




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