kernel: backport list_count_nodes()

It's needed by various stuff we backport. That includes NVMEM changes
queued for v6.8.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 75 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/829-v6.3-i915-Move-list_count-to-list.h-as-list_count_nodes-f.patch b/target/linux/generic/backport-5.15/829-v6.3-i915-Move-list_count-to-list.h-as-list_count_nodes-f.patch
new file mode 100644
index 0000000000..1365834563
--- /dev/null
+++ b/target/linux/generic/backport-5.15/829-v6.3-i915-Move-list_count-to-list.h-as-list_count_nodes-f.patch
@@ -0,0 +1,75 @@
+From 4d70c74659d9746502b23d055dba03d1d28ec388 Mon Sep 17 00:00:00 2001
+From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Date: Wed, 30 Nov 2022 15:48:35 +0200
+Subject: [PATCH] i915: Move list_count() to list.h as list_count_nodes() for
+ broader use
+
+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.
+
+Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
+Acked-by: Jani Nikula <jani.nikula@intel.com>
+Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Link: https://lore.kernel.org/r/20221130134838.23805-1-andriy.shevchenko@linux.intel.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/i915/gt/intel_engine_cs.c | 15 ++-------------
+ include/linux/list.h                      | 15 +++++++++++++++
+ 2 files changed, 17 insertions(+), 13 deletions(-)
+
+--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
++++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+@@ -1639,17 +1639,6 @@ static void print_request_ring(struct dr
+ 	}
+ }
+ 
+-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);
+@@ -1824,8 +1813,8 @@ void intel_engine_dump(struct intel_engi
+ 	spin_lock_irqsave(&engine->sched_engine->lock, flags);
+ 	engine_dump_active_requests(engine, m);
+ 
+-	drm_printf(m, "\tOn hold?: %lu\n",
+-		   list_count(&engine->sched_engine->hold));
++	drm_printf(m, "\tOn hold?: %zu\n",
++		   list_count_nodes(&engine->sched_engine->hold));
+ 	spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
+ 
+ 	drm_printf(m, "\tMMIO base:  0x%08x\n", engine->mmio_base);
+--- a/include/linux/list.h
++++ b/include/linux/list.h
+@@ -628,6 +628,21 @@ static inline void list_splice_tail_init
+ 	     pos = n, n = pos->prev)
+ 
+ /**
++ * list_count_nodes - count nodes in the list
++ * @head:	the head for your list.
++ */
++static inline size_t list_count_nodes(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
+  * @head:	the head for your list.