Re: [PATCH kvmtool 03/16] brlock: fix build with KVM_BRLOCK_DEBUG

[Andre Przywara <andre.przywara@arm.com>]

On Thu, 7 Mar 2019 08:36:04 +0000
Julien Thierry <julien.thierry@arm.com> wrote:

> Build breaks when using KVM_BRLOCK_DEBUG because the header was seamingly
> conceived to be included in a single .c file...
> 
> Fix this by moving the definition of the read/write lock into the kvm
> struct.
> 
> Signed-off-by: Julien Thierry <julien.thierry@arm.com>

Reviewed-by: Andre Przywara <andre.przywara@arm.com>

Cheers,
Andre.

> ---
>  include/kvm/brlock.h | 10 ++++------
>  include/kvm/kvm.h    |  4 ++++
>  kvm.c                |  4 ++++
>  3 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/include/kvm/brlock.h b/include/kvm/brlock.h
> index 29f72e0..1862210 100644
> --- a/include/kvm/brlock.h
> +++ b/include/kvm/brlock.h
> @@ -21,13 +21,11 @@
>  
>  #include "kvm/rwsem.h"
>  
> -DECLARE_RWSEM(brlock_sem);
> +#define br_read_lock(kvm)	down_read(&(kvm)->brlock_sem);
> +#define br_read_unlock(kvm)	up_read(&(kvm)->brlock_sem);
>  
> -#define br_read_lock(kvm)	down_read(&brlock_sem);
> -#define br_read_unlock(kvm)	up_read(&brlock_sem);
> -
> -#define br_write_lock(kvm)	down_write(&brlock_sem);
> -#define br_write_unlock(kvm)	up_write(&brlock_sem);
> +#define br_write_lock(kvm)	down_write(&(kvm)->brlock_sem);
> +#define br_write_unlock(kvm)	up_write(&(kvm)->brlock_sem);
>  
>  #else
>  
> diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> index 1edacfd..7a73818 100644
> --- a/include/kvm/kvm.h
> +++ b/include/kvm/kvm.h
> @@ -81,6 +81,10 @@ struct kvm {
>  	int                     nr_disks;
>  
>  	int			vm_state;
> +
> +#ifdef KVM_BRLOCK_DEBUG
> +	pthread_rwlock_t	brlock_sem;
> +#endif
>  };
>  
>  void kvm__set_dir(const char *fmt, ...);
> diff --git a/kvm.c b/kvm.c
> index d5249a0..57c4ff9 100644
> --- a/kvm.c
> +++ b/kvm.c
> @@ -160,6 +160,10 @@ struct kvm *kvm__new(void)
>  	kvm->sys_fd = -1;
>  	kvm->vm_fd = -1;
>  
> +#ifdef KVM_BRLOCK_DEBUG
> +	kvm->brlock_sem = (pthread_rwlock_t) PTHREAD_RWLOCK_INITIALIZER;
> +#endif
> +
>  	return kvm;
>  }
>