mm/slab_common: fold kmalloc_order_trace() into kmalloc_large()

There is no caller of kmalloc_order_trace() except kmalloc_large().
Fold it into kmalloc_large() and remove kmalloc_order{,_trace}().

Also add tracepoint in kmalloc_large() that was previously
in kmalloc_order_trace().
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

include/linux/slab.h

@@ -489,26 +489,8 @@ static __always_inline void *kmem_cache_alloc_node_trace(struct kmem_cache *s, g
 }
 #endif /* CONFIG_TRACING */
 
-extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment
-									 __alloc_size(1);
-
-#ifdef CONFIG_TRACING
-extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
-				__assume_page_alignment __alloc_size(1);
-#else
-static __always_inline __alloc_size(1) void *kmalloc_order_trace(size_t size, gfp_t flags,
-								 unsigned int order)
-{
-	return kmalloc_order(size, flags, order);
-}
-#endif
-
-static __always_inline __alloc_size(1) void *kmalloc_large(size_t size, gfp_t flags)
-{
-	unsigned int order = get_order(size);
-	return kmalloc_order_trace(size, flags, order);
-}
-
+void *kmalloc_large(size_t size, gfp_t flags) __assume_page_alignment
+					      __alloc_size(1);
 /**
  * kmalloc - allocate memory
  * @size: how many bytes of memory are required.

mm/slab_common.c

@@ -905,16 +905,16 @@ gfp_t kmalloc_fix_flags(gfp_t flags)
  * directly to the page allocator. We use __GFP_COMP, because we will need to
  * know the allocation order to free the pages properly in kfree.
  */
-void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
+void *kmalloc_large(size_t size, gfp_t flags)
 {
 	void *ret = NULL;
 	struct page *page;
+	unsigned int order = get_order(size);
 
 	if (unlikely(flags & GFP_SLAB_BUG_MASK))
 		flags = kmalloc_fix_flags(flags);
 
-	flags |= __GFP_COMP;
-	page = alloc_pages(flags, order);
+	page = alloc_pages(flags | __GFP_COMP, order);
 	if (likely(page)) {
 		ret = page_address(page);
 		mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
@@ -923,19 +923,10 @@ void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
 	ret = kasan_kmalloc_large(ret, size, flags);
 	/* As ret might get tagged, call kmemleak hook after KASAN. */
 	kmemleak_alloc(ret, size, 1, flags);
-	return ret;
-}
-EXPORT_SYMBOL(kmalloc_order);
-
-#ifdef CONFIG_TRACING
-void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
-{
-	void *ret = kmalloc_order(size, flags, order);
 	trace_kmalloc(_RET_IP_, ret, NULL, size, PAGE_SIZE << order, flags);
 	return ret;
 }
-EXPORT_SYMBOL(kmalloc_order_trace);
-#endif
+EXPORT_SYMBOL(kmalloc_large);
 
 #ifdef CONFIG_SLAB_FREELIST_RANDOM
 /* Randomize a generic freelist */