diff mbox

[v2,2/3] exec: adjust rcu_read_lock requirement

Message ID 1462845901-89716-3-git-send-email-arei.gonglei@huawei.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gonglei (Arei) May 10, 2016, 2:05 a.m. UTC 
qemu_ram_unset_idstr() doesn't need rcu lock anymore,
meanwhile make the range of rcu lock in
qemu_ram_set_idstr() as small as possible.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
---
 exec.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
diff mbox

Patch

diff --git a/exec.c b/exec.c
index c840bc7..117c9a8 100644
--- a/exec.c
+++ b/exec.c
@@ -1417,8 +1417,6 @@  void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev)
 {
     RAMBlock *block;
 
-    rcu_read_lock();
-
     assert(new_block);
     assert(!new_block->idstr[0]);
 
@@ -1431,6 +1429,7 @@  void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev)
     }
     pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
 
+    rcu_read_lock();
     QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
         if (block != new_block &&
             !strcmp(block->idstr, new_block->idstr)) {
@@ -1449,12 +1448,9 @@  void qemu_ram_unset_idstr(RAMBlock *block)
      * migration.  Ignore the problem since hot-unplug during migration
      * does not work anyway.
      */
-
-    rcu_read_lock();
     if (block) {
         memset(block->idstr, 0, sizeof(block->idstr));
     }
-    rcu_read_unlock();
 }
 
 static int memory_try_enable_merging(void *addr, size_t len)