linux-kernel - [PATCH 4/5] radix tree test suite: Delete unused rcupdate.c

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Date:   Tue, 13 Dec 2016 14:21:31 -0800
From:   Matthew Wilcox <mawilcox@...uxonhyperv.com>
To:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 4/5] radix tree test suite: Delete unused rcupdate.c

From: Matthew Wilcox <mawilcox@...rosoft.com>

This file was used to implement call_rcu() before liburcu implemented
that function.  It hasn't even been compiled since before the test suite
was added to the kernel.  Remove it to reduce confusion.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 tools/testing/radix-tree/rcupdate.c | 86 -------------------------------------
 1 file changed, 86 deletions(-)
 delete mode 100644 tools/testing/radix-tree/rcupdate.c

diff --git a/tools/testing/radix-tree/rcupdate.c b/tools/testing/radix-tree/rcupdate.c
deleted file mode 100644
index 31a2d14..0000000
--- a/tools/testing/radix-tree/rcupdate.c
+++ /dev/null
@@ -1,86 +0,0 @@
-#include <linux/rcupdate.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <assert.h>
-
-static pthread_mutex_t rculock = PTHREAD_MUTEX_INITIALIZER;
-static struct rcu_head *rcuhead_global = NULL;
-static __thread int nr_rcuhead = 0;
-static __thread struct rcu_head *rcuhead = NULL;
-static __thread struct rcu_head *rcutail = NULL;
-
-static pthread_cond_t rcu_worker_cond = PTHREAD_COND_INITIALIZER;
-
-/* switch to urcu implementation when it is merged. */
-void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *head))
-{
-	head->func = func;
-	head->next = rcuhead;
-	rcuhead = head;
-	if (!rcutail)
-		rcutail = head;
-	nr_rcuhead++;
-	if (nr_rcuhead >= 1000) {
-		int signal = 0;
-
-		pthread_mutex_lock(&rculock);
-		if (!rcuhead_global)
-			signal = 1;
-		rcutail->next = rcuhead_global;
-		rcuhead_global = head;
-		pthread_mutex_unlock(&rculock);
-
-		nr_rcuhead = 0;
-		rcuhead = NULL;
-		rcutail = NULL;
-
-		if (signal) {
-			pthread_cond_signal(&rcu_worker_cond);
-		}
-	}
-}
-
-static void *rcu_worker(void *arg)
-{
-	struct rcu_head *r;
-
-	rcupdate_thread_init();
-
-	while (1) {
-		pthread_mutex_lock(&rculock);
-		while (!rcuhead_global) {
-			pthread_cond_wait(&rcu_worker_cond, &rculock);
-		}
-		r = rcuhead_global;
-		rcuhead_global = NULL;
-
-		pthread_mutex_unlock(&rculock);
-
-		synchronize_rcu();
-
-		while (r) {
-			struct rcu_head *tmp = r->next;
-			r->func(r);
-			r = tmp;
-		}
-	}
-
-	rcupdate_thread_exit();
-
-	return NULL;
-}
-
-static pthread_t worker_thread;
-void rcupdate_init(void)
-{
-	pthread_create(&worker_thread, NULL, rcu_worker, NULL);
-}
-
-void rcupdate_thread_init(void)
-{
-	rcu_register_thread();
-}
-void rcupdate_thread_exit(void)
-{
-	rcu_unregister_thread();
-}
-- 
2.10.2