util/log: add CONFIG_DISABLE_QEMU_LOG macro

Using CONFIG_DISABLE_QEMU_LOG macro to control
qemu_log function.

Signed-off-by: Yan Wang <wangyan122@huawei.com>
Signed-off-by: imxcc <xingchaochao@huawei.com>
(cherry picked from commit 0cea596fd445015a851dbd2bfe634644ae30883a)

util-log-add-CONFIG_DISABLE_QEMU_LOG-macro.patch

@@ -0,0 +1,41 @@
+From 05462305ec8b9ce5b414ede1e7e680b16d1a08ad Mon Sep 17 00:00:00 2001
+From: Yan Wang <wangyan122@huawei.com>
+Date: Fri, 11 Feb 2022 18:20:59 +0800
+Subject: [PATCH] util/log: add CONFIG_DISABLE_QEMU_LOG macro
+
+Using CONFIG_DISABLE_QEMU_LOG macro to control
+qemu_log function.
+
+Signed-off-by: Yan Wang <wangyan122@huawei.com>
+---
+ util/log.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/util/log.c b/util/log.c
+index 2ee1500bee..ed3029fe5c 100644
+--- a/util/log.c
++++ b/util/log.c
+@@ -34,6 +34,12 @@ int qemu_loglevel;
+ static int log_append = 0;
+ static GArray *debug_regions;
+ 
++#ifdef CONFIG_DISABLE_QEMU_LOG
++int qemu_log(const char *fmt, ...)
++{
++    return 0;
++}
++#else
+ /* Return the number of characters emitted.  */
+ int qemu_log(const char *fmt, ...)
+ {
+@@ -56,6 +62,7 @@ int qemu_log(const char *fmt, ...)
+     rcu_read_unlock();
+     return ret;
+ }
++#endif
+ 
+ static void __attribute__((__constructor__)) qemu_logfile_init(void)
+ {
+-- 
+2.27.0
+