percpu: kill percpu_alloc() and friends

Impact: kill unused functions

percpu_alloc() and its friends never saw much action.  It was supposed
to replace the cpu-mask unaware __alloc_percpu() but it never happened
and in fact __percpu_alloc_mask() itself never really grew proper
up/down handling interface either (no exported interface for
populate/depopulate).

percpu allocation is about to go through major reimplementation and
there's no reason to carry this unused interface around.  Replace it
with __alloc_percpu() and free_percpu().

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 19 insertions, 13 deletions

diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c
index 4297bc41bfd2..3653c570232b 100644
--- a/mm/allocpercpu.c
+++ b/mm/allocpercpu.c
@@ -99,45 +99,51 @@ static int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
         __percpu_populate_mask((__pdata), (size), (gfp), &(mask))
 
 /**
- * percpu_alloc_mask - initial setup of per-cpu data
+ * alloc_percpu - initial setup of per-cpu data
  * @size: size of per-cpu object
- * @gfp: may sleep or not etc.
- * @mask: populate per-data for cpu's selected through mask bits
+ * @align: alignment
  *
- * Populating per-cpu data for all online cpu's would be a typical use case,
- * which is simplified by the percpu_alloc() wrapper.
- * Per-cpu objects are populated with zeroed buffers.
+ * Allocate dynamic percpu area.  Percpu objects are populated with
+ * zeroed buffers.
  */
-void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
+void *__alloc_percpu(size_t size, size_t align)
 {
         /*
          * We allocate whole cache lines to avoid false sharing
          */
         size_t sz = roundup(nr_cpu_ids * sizeof(void *), cache_line_size());
-        void *pdata = kzalloc(sz, gfp);
+        void *pdata = kzalloc(sz, GFP_KERNEL);
         void *__pdata = __percpu_disguise(pdata);
 
+        /*
+         * Can't easily make larger alignment work with kmalloc.  WARN
+         * on it.  Larger alignment should only be used for module
+         * percpu sections on SMP for which this path isn't used.
+         */
+        WARN_ON_ONCE(align > __alignof__(unsigned long long));
+
         if (unlikely(!pdata))
                 return NULL;
-        if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask)))
+        if (likely(!__percpu_populate_mask(__pdata, size, GFP_KERNEL,
+                                           &cpu_possible_map)))
                 return __pdata;
         kfree(pdata);
         return NULL;
 }
-EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
+EXPORT_SYMBOL_GPL(__alloc_percpu);
 
 /**
- * percpu_free - final cleanup of per-cpu data
+ * free_percpu - final cleanup of per-cpu data
  * @__pdata: object to clean up
  *
  * We simply clean up any per-cpu object left. No need for the client to
  * track and specify through a bis mask which per-cpu objects are to free.
  */
-void percpu_free(void *__pdata)
+void free_percpu(void *__pdata)
 {
         if (unlikely(!__pdata))
                 return;
         __percpu_depopulate_mask(__pdata, &cpu_possible_map);
         kfree(__percpu_disguise(__pdata));
 }
-EXPORT_SYMBOL_GPL(percpu_free);
+EXPORT_SYMBOL_GPL(free_percpu);