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


From: Laurent Vivier
Subject: Re: [PATCH] block/qcow2-bitmap: Add missing cast to silent GCC error
Date: Thu, 29 Sep 2022 21:27:09 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.1

Le 22/09/2022 à 17:37, Kevin Wolf a écrit :
Am 19.09.2022 um 20:27 hat Philippe Mathieu-Daudé geschrieben:
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>

Thanks, applied to the block branch. And in case qemu-trivial picks it
up anyway:

Reviewed-by: Kevin Wolf <kwolf@redhat.com>



It doesn't seem to be merged yet. Applied to my trivial-patches branch.

If you push it first I will remove it.

Thanks,
Laurent



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