Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h
new file mode 100644
index 000000000..241245cb5
--- /dev/null
+++ b/io_uring/alloc_cache.h
@@ -0,0 +1,67 @@
+#ifndef IOU_ALLOC_CACHE_H
+#define IOU_ALLOC_CACHE_H
+
+/*
+ * Don't allow the cache to grow beyond this size.
+ */
+#define IO_ALLOC_CACHE_MAX	512
+
+struct io_cache_entry {
+	struct io_wq_work_node node;
+};
+
+static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
+				      struct io_cache_entry *entry)
+{
+	if (cache->nr_cached < cache->max_cached) {
+		cache->nr_cached++;
+		wq_stack_add_head(&entry->node, &cache->list);
+		/* KASAN poisons object */
+		kasan_slab_free_mempool(entry);
+		return true;
+	}
+	return false;
+}
+
+static inline bool io_alloc_cache_empty(struct io_alloc_cache *cache)
+{
+	return !cache->list.next;
+}
+
+static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
+{
+	if (cache->list.next) {
+		struct io_cache_entry *entry;
+
+		entry = container_of(cache->list.next, struct io_cache_entry, node);
+		kasan_unpoison_range(entry, cache->elem_size);
+		cache->list.next = cache->list.next->next;
+		cache->nr_cached--;
+		return entry;
+	}
+
+	return NULL;
+}
+
+static inline void io_alloc_cache_init(struct io_alloc_cache *cache,
+				       unsigned max_nr, size_t size)
+{
+	cache->list.next = NULL;
+	cache->nr_cached = 0;
+	cache->max_cached = max_nr;
+	cache->elem_size = size;
+}
+
+static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
+					void (*free)(struct io_cache_entry *))
+{
+	while (1) {
+		struct io_cache_entry *entry = io_alloc_cache_get(cache);
+
+		if (!entry)
+			break;
+		free(entry);
+	}
+	cache->nr_cached = 0;
+}
+#endif