The patch titled
Subject: radix tree test suite: delete unused rcupdate.c
has been added to the -mm tree. Its filename is
radix-tree-test-suite-delete-unused-rcupdatec.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/radix-tree-test-suite-delete-unused-rcupdatec.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/radix-tree-test-suite-delete-unused-rcupdatec.patch
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------------------------------------------------------
From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: radix tree test suite: delete unused rcupdate.c
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.
Link: http://lkml.kernel.org/r/1481667692-14500-5-git-send-email-mawilcox@xxxxxxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/radix-tree/rcupdate.c | 86 --------------------------
1 file changed, 86 deletions(-)
diff -puN tools/testing/radix-tree/rcupdate.c~radix-tree-test-suite-delete-unused-rcupdatec /dev/null
--- 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();
-}
_
Patches currently in -mm which might be from mawilcox@xxxxxxxxxxxxx are
radix-tree-test-suite-fix-compilation.patch
radix-tree-test-suite-iteration-test-misuses-rcu.patch
radix-tree-test-suite-use-rcu_barrier.patch
radix-tree-test-suite-handle-exceptional-entries.patch
radix-tree-test-suite-record-order-in-each-item.patch
btrfs-fix-race-in-btrfs_free_dummy_fs_info.patch
radix-tree-improve-multiorder-iterators.patch
radix-tree-delete-radix_tree_locate_item.patch
radix-tree-delete-radix_tree_range_tag_if_tagged.patch
radix-tree-fix-replacement-for-multiorder-entries.patch
radix-tree-test-suite-check-multiorder-iteration.patch
tpm-use-idr_find-not-idr_find_slowpath.patch
rxrpc-abstract-away-knowledge-of-idr-internals.patch
radix-tree-test-suite-cache-recently-freed-objects.patch
radix-tree-ensure-counts-are-initialised.patch
radix-tree-test-suite-add-new-tag-check.patch
radix-tree-test-suite-delete-unused-rcupdatec.patch
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