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migration: fix uninitialized variable warning in migrate_send_rp_req_pages() 

After the WITH_QEMU_LOCK_GUARD macro is added, the compiler cannot identify
 that the statements in the macro must be executed. As a result, some variables
 assignment statements in the macro may be considered as unexecuted by the compiler.

When the -Wmaybe-uninitialized capability is enabled on GCC9,the compiler showed warning:
migration/migration.c: In function ‘migrate_send_rp_req_pages’:
migration/migration.c:384:8: warning: ‘received’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 384 |     if (received) {
     |        ^

Add a default value for 'received' to prevented the warning.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20201111142203.2359370-6-kuhn.chenqun@huawei.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Chen Qun 2020-11-11 22:22:03 +08:00 committed by Dr. David Alan Gilbert
parent a1af605bd5
commit a24292830b
1 changed files with 1 additions and 1 deletions
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2
migration/migration.c
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@ -365,7 +365,7 @@ int migrate_send_rp_req_pages(MigrationIncomingState *mis,
RAMBlock *rb, ram_addr_t start, uint64_t haddr) RAMBlock *rb, ram_addr_t start, uint64_t haddr)
{ {
void *aligned = (void *)(uintptr_t)(haddr & (-qemu_ram_pagesize(rb))); void *aligned = (void *)(uintptr_t)(haddr & (-qemu_ram_pagesize(rb)));
bool received; bool received = false;
WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) { WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) {
received = ramblock_recv_bitmap_test_byte_offset(rb, start); received = ramblock_recv_bitmap_test_byte_offset(rb, start);