Re: [Xen-devel] [PATCH v7 01/11] qapi/error: add (Error **errp) cleaning APIs

[Markus Armbruster <armbru@redhat.com>]

Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> writes:

> Add functions to clean Error **errp: call corresponding Error *err
> cleaning function an set pointer to NULL.
>
> New functions:
>   error_free_errp
>   error_report_errp
>   warn_report_errp
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Greg Kurz <groug@kaod.org>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
>
> CC: Eric Blake <eblake@redhat.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Max Reitz <mreitz@redhat.com>
> CC: Greg Kurz <groug@kaod.org>
> CC: Stefano Stabellini <sstabellini@kernel.org>
> CC: Anthony Perard <anthony.perard@citrix.com>
> CC: Paul Durrant <paul@xen.org>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> CC: "Philippe Mathieu-Daudé" <philmd@redhat.com>
> CC: Laszlo Ersek <lersek@redhat.com>
> CC: Gerd Hoffmann <kraxel@redhat.com>
> CC: Stefan Berger <stefanb@linux.ibm.com>
> CC: Markus Armbruster <armbru@redhat.com>
> CC: Michael Roth <mdroth@linux.vnet.ibm.com>
> CC: qemu-block@nongnu.org
> CC: xen-devel@lists.xenproject.org
>
>  include/qapi/error.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/include/qapi/error.h b/include/qapi/error.h
> index ad5b6e896d..d34987148d 100644
> --- a/include/qapi/error.h
> +++ b/include/qapi/error.h
> @@ -309,6 +309,32 @@ void warn_reportf_err(Error *err, const char *fmt, ...)
>  void error_reportf_err(Error *err, const char *fmt, ...)
>      GCC_FMT_ATTR(2, 3);
>  
> +/*
> + * Functions to clean Error **errp: call corresponding Error *err cleaning
> + * function, then set pointer to NULL.
> + */
> +static inline void error_free_errp(Error **errp)
> +{
> +    assert(errp && *errp);
> +    error_free(*errp);
> +    *errp = NULL;
> +}
> +
> +static inline void error_report_errp(Error **errp)
> +{
> +    assert(errp && *errp);
> +    error_report_err(*errp);
> +    *errp = NULL;
> +}
> +
> +static inline void warn_report_errp(Error **errp)
> +{
> +    assert(errp && *errp);
> +    warn_report_err(*errp);
> +    *errp = NULL;
> +}
> +
> +
>  /*
>   * Just like error_setg(), except you get to specify the error class.
>   * Note: use of error classes other than ERROR_CLASS_GENERIC_ERROR is

These appear to be unused apart from the Coccinelle script in PATCH 03.

They are used in the full "[RFC v5 000/126] error: auto propagated
local_err" series.  Options:

1. Pick a few more patches into this part I series, so these guys come
   with users.

2. Punt this patch to the first part that has users, along with the
   part of the Coccinelle script that deals with them.

3. Do nothing: accept the functions without users.

I habitually dislike 3., but reviewing the rest of this series might
make me override that dislike.


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