Re: [PATCH] cpuset: Clean up cpuset_node_allowed

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On 3/17/23 21:35, Waiman Long wrote:
On 2/28/23 03:35, Haifeng Xu wrote:
Commit 002f290627c2 ("cpuset: use static key better and convert to new API") has used __cpuset_node_allowed() instead of cpuset_node_allowed() to check whether we can allocate on a memory node. Now this function isn't used by
anyone, so we can do the follow things to clean up it.

1. remove unused codes
2. rename __cpuset_node_allowed() to cpuset_node_allowed()
3. update comments in mm/page_alloc.c

Suggested-by: Waiman Long <longman@xxxxxxxxxx>
Signed-off-by: Haifeng Xu <haifeng.xu@xxxxxxxxxx>
---
  include/linux/cpuset.h | 16 ++--------------
  kernel/cgroup/cpuset.c |  4 ++--
  mm/page_alloc.c        |  4 ++--
  3 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index d58e0476ee8e..980b76a1237e 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -80,18 +80,11 @@ extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
  void cpuset_init_current_mems_allowed(void);
  int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
  -extern bool __cpuset_node_allowed(int node, gfp_t gfp_mask);
-
-static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
-{
-    if (cpusets_enabled())
-        return __cpuset_node_allowed(node, gfp_mask);
-    return true;
-}
+extern bool cpuset_node_allowed(int node, gfp_t gfp_mask);
    static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
  {
-    return __cpuset_node_allowed(zone_to_nid(z), gfp_mask);
+    return cpuset_node_allowed(zone_to_nid(z), gfp_mask);
  }
    static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) @@ -223,11 +216,6 @@ static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
      return 1;
  }
  -static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
-{
-    return true;
-}
-

Sorry for the late reply as I apparently drop the ball.

You need to keep the above cpuset_node_allowed() inline function or you will get compilation error when compiling with a config without CONFIG_CPUSETS. Other than that, the other changes look good.

It turns out that cpuset_node_allowed() isn't used anywhere except in cpuset.h. So it should be OK to remove the alternate cpuset_node_allowed() function.

Acked-by: Waiman Long <longman@xxxxxxxxxx>




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