io_uring/rsrc: use kvfree() for the imu cache

Currently anything that requires kvmalloc_flex() for allocations will
not get re-cached, and hence the cache freeing path is correct in that
it always uses kfree() to free the allocated memory. But this seems a
bit fragile as it's something that could get mix should that situation
change, so switch io_free_imu() and io_alloc_cache_free() to use kvfree
as the desctructor.

Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

io_uring/alloc_cache.h

@@ -64,7 +64,7 @@ static inline void *io_cache_alloc(struct io_alloc_cache *cache, gfp_t gfp)
 static inline void io_cache_free(struct io_alloc_cache *cache, void *obj)
 {
 	if (!io_alloc_cache_put(cache, obj))
-		kfree(obj);
+		kvfree(obj);
 }
 
 #endif

io_uring/rsrc.c

@@ -168,7 +168,7 @@ bool io_rsrc_cache_init(struct io_ring_ctx *ctx)
 void io_rsrc_cache_free(struct io_ring_ctx *ctx)
 {
 	io_alloc_cache_free(&ctx->node_cache, kfree);
-	io_alloc_cache_free(&ctx->imu_cache, kfree);
+	io_alloc_cache_free(&ctx->imu_cache, kvfree);
 }
 
 static void io_clear_table_tags(struct io_rsrc_data *data)