target/linux/generic/backport-5.15/829-v6.3-i915-Move-list_count-to-list.h-as-list_count_nodes-f.patch

   1 From 4d70c74659d9746502b23d055dba03d1d28ec388 Mon Sep 17 00:00:00 2001
   2 From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   3 Date: Wed, 30 Nov 2022 15:48:35 +0200
   4 Subject: [PATCH] i915: Move list_count() to list.h as list_count_nodes() for
   5  broader use
   6
   7 Some of the existing users, and definitely will be new ones, want to
   8 count existing nodes in the list. Provide a generic API for that by
   9 moving code from i915 to list.h.
  10
  11 Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
  12 Acked-by: Jani Nikula <jani.nikula@intel.com>
  13 Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
  14 Link: https://lore.kernel.org/r/20221130134838.23805-1-andriy.shevchenko@linux.intel.com
  15 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  16 ---
  17  drivers/gpu/drm/i915/gt/intel_engine_cs.c | 15 ++-------------
  18  include/linux/list.h                      | 15 +++++++++++++++
  19  2 files changed, 17 insertions(+), 13 deletions(-)
  20
  21 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
  22 +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
  23 @@ -1639,17 +1639,6 @@ static void print_request_ring(struct dr
  24         }
  25  }
  26
  27 -static unsigned long list_count(struct list_head *list)
  28 -{
  29 -       struct list_head *pos;
  30 -       unsigned long count = 0;
  31 -
  32 -       list_for_each(pos, list)
  33 -               count++;
  34 -
  35 -       return count;
  36 -}
  37 -
  38  static unsigned long read_ul(void *p, size_t x)
  39  {
  40         return *(unsigned long *)(p + x);
  41 @@ -1824,8 +1813,8 @@ void intel_engine_dump(struct intel_engi
  42         spin_lock_irqsave(&engine->sched_engine->lock, flags);
  43         engine_dump_active_requests(engine, m);
  44
  45 -       drm_printf(m, "\tOn hold?: %lu\n",
  46 -                  list_count(&engine->sched_engine->hold));
  47 +       drm_printf(m, "\tOn hold?: %zu\n",
  48 +                  list_count_nodes(&engine->sched_engine->hold));
  49         spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
  50
  51         drm_printf(m, "\tMMIO base:  0x%08x\n", engine->mmio_base);
  52 --- a/include/linux/list.h
  53 +++ b/include/linux/list.h
  54 @@ -628,6 +628,21 @@ static inline void list_splice_tail_init
  55              pos = n, n = pos->prev)
  56
  57  /**
  58 + * list_count_nodes - count nodes in the list
  59 + * @head:      the head for your list.
  60 + */
  61 +static inline size_t list_count_nodes(struct list_head *head)
  62 +{
  63 +       struct list_head *pos;
  64 +       size_t count = 0;
  65 +
  66 +       list_for_each(pos, head)
  67 +               count++;
  68 +
  69 +       return count;
  70 +}
  71 +
  72 +/**
  73   * list_entry_is_head - test if the entry points to the head of the list
  74   * @pos:       the type * to cursor
  75   * @head:      the head for your list.