Re: [Qemu-devel] [PATCH] Properly check if 'log dirty' flags have changed

[Eric Blake <eblake@redhat.com>]

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On 02/17/2014 06:47 AM, Vincent KHERBACHE wrote:
> The test (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) is not
> good because the condition is valid when enable == 0 and current dirty log
> memory flag is set.
> As a consequence kvm_log_global_stop() does not stop the KVM dirty log
> tracking: kvm_set_migration_log(0) didn't do its job.
> So instead I propose to use kvm_slot_dirty_pages_log_change() which correctly
> compare the memory flags (old/new).
> 
> Signed-off-by: Vincent KHERBACHE <vincent.kherbache@inria.fr>
> ---
>  kvm-all.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
> 

> +        err = kvm_slot_dirty_pages_log_change(mem, (bool)enable);

Casting to bool looks odd.  We already require a compliant C99 compiler,
which means the compiler already properly handles the squashing of all
non-zero values to true when calling a function with a parameter
prototyped as bool, without needing the cast.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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