x86: bpf_jit_comp: can call module_free() from any context

It looks like we can call module_free()/vfree() from softirq context,
so no longer need a wrapper and a work_struct.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/x86/net/bpf_jit_comp.c

@@ -717,9 +717,7 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 			break;
 		}
 		if (proglen == oldproglen) {
-			image = module_alloc(max_t(unsigned int,
-						   proglen,
-						   sizeof(struct work_struct)));
+			image = module_alloc(proglen);
 			if (!image)
 				goto out;
 		}
@@ -738,20 +736,8 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 	return;
 }
 
-static void jit_free_defer(struct work_struct *arg)
-{
-	module_free(NULL, arg);
-}
-
-/* run from softirq, we must use a work_struct to call
- * module_free() from process context
- */
 void bpf_jit_free(struct sk_filter *fp)
 {
-	if (fp->bpf_func != sk_run_filter) {
-		struct work_struct *work = (struct work_struct *)fp->bpf_func;
-
-		INIT_WORK(work, jit_free_defer);
-		schedule_work(work);
-	}
+	if (fp->bpf_func != sk_run_filter)
+		module_free(NULL, fp->bpf_func);
 }