[PATCH] block/qcow2-bitmap: Add missing cast to silent GCC error

* [PATCH] block/qcow2-bitmap: Add missing cast to silent GCC error
@ 2022-09-19 18:27 Philippe Mathieu-Daudé via
  2022-09-19 19:10 ` Vladimir Sementsov-Ogievskiy
  2022-09-22 15:37 ` Kevin Wolf
  0 siblings, 2 replies; 4+ messages in thread
From: Philippe Mathieu-Daudé via @ 2022-09-19 18:27 UTC (permalink / raw)
  To: qemu-devel
  Cc: Vladimir Sementsov-Ogievskiy, qemu-trivial, Kevin Wolf,
	Eric Blake, qemu-block, John Snow, Hanna Reitz,
	Philippe Mathieu-Daudé,
	Vladimir Sementsov-Ogievskiy, Max Reitz

Commit d1258dd0c8 ("qcow2: autoloading dirty bitmaps") added the
set_readonly_helper() GFunc handler, correctly casting the gpointer
user_data in both the g_slist_foreach() caller and the handler.
Few commits later (commit 1b6b0562db), the handler is reused in
qcow2_reopen_bitmaps_rw() but missing the gpointer cast, resulting
in the following error when using Homebrew GCC 12.2.0:

  [2/658] Compiling C object libblock.fa.p/block_qcow2-bitmap.c.o
  ../../block/qcow2-bitmap.c: In function 'qcow2_reopen_bitmaps_rw':
  ../../block/qcow2-bitmap.c:1211:60: error: incompatible type for argument 3 of 'g_slist_foreach'
   1211 |     g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, false);
        |                                                            ^~~~~
        |                                                            |
        |                                                            _Bool
  In file included from /opt/homebrew/Cellar/glib/2.72.3_1/include/glib-2.0/glib/gmain.h:26,
                   from /opt/homebrew/Cellar/glib/2.72.3_1/include/glib-2.0/glib/giochannel.h:33,
                   from /opt/homebrew/Cellar/glib/2.72.3_1/include/glib-2.0/glib.h:54,
                   from /Users/philmd/source/qemu/include/glib-compat.h:32,
                   from /Users/philmd/source/qemu/include/qemu/osdep.h:144,
                   from ../../block/qcow2-bitmap.c:28:
  /opt/homebrew/Cellar/glib/2.72.3_1/include/glib-2.0/glib/gslist.h:127:61: note: expected 'gpointer' {aka 'void *'} but argument is of type '_Bool'
    127 |                                           gpointer          user_data);
        |                                           ~~~~~~~~~~~~~~~~~~^~~~~~~~~
  At top level:
  FAILED: libblock.fa.p/block_qcow2-bitmap.c.o

Fix by adding the missing gpointer cast.

Fixes: 1b6b0562db ("qcow2: support .bdrv_reopen_bitmaps_rw")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Cc: John Snow <jsnow@redhat.com>
Cc: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-bitmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index ff3309846c..7197754843 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1208,7 +1208,7 @@ int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp)
         }
     }
 
-    g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, false);
+    g_slist_foreach(ro_dirty_bitmaps, set_readonly_helper, (gpointer)false);
     ret = 0;
 
 out:
-- 
2.37.3



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