[Qemu-devel] [PATCH v2] linux-user/main.c: Remove redundant end_exclusive() in arm_kernel_cmpxchg64_helper()

[Chen Gang S <gang.chen@sunrus.com.cn>]

start/end_exclusive() need be pairs, except the start_exclusive() in
stop_all_tasks() which is only used by force_sig(), which will be abort.
So at present, start_exclusive() in stop_all_task() need not be paired.

queue_signal() may call force_sig(), or return after kill pid (or queue
signal). If could return from queue_signal(), stop_all_task() would not
be called in time, the next end_exclusive() would be issue.

So in arm_kernel_cmpxchg64_helper() for ARM, need remove end_exclusive()
after queue_signal(). The related commit: "97cc756 linux-user: Implement
new ARM 64 bit cmpxchg kernel helper".


Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 linux-user/main.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/linux-user/main.c b/linux-user/main.c
index 8c70be4..2d52c1f 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -523,8 +523,6 @@ segv:
     info.si_code = TARGET_SEGV_MAPERR;
     info._sifields._sigfault._addr = env->exception.vaddress;
     queue_signal(env, info.si_signo, &info);
-
-    end_exclusive();
 }
 
 /* Handle a jump to the kernel code page.  */
-- 
1.9.3