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Re: [PATCH v2 1/3] error: auto propagated local_err
From: |
Laurent Vivier |
Subject: |
Re: [PATCH v2 1/3] error: auto propagated local_err |
Date: |
Thu, 11 Jun 2020 11:38:43 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 |
On 11/06/2020 11:09, Greg Kurz wrote:
> From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>
> Introduce a new ERRP_AUTO_PROPAGATE macro, to be used at start of
> functions with an errp OUT parameter.
>
> It has three goals:
>
> 1. Fix issue with error_fatal and error_prepend/error_append_hint: user
> can't see this additional information, because exit() happens in
> error_setg earlier than information is added. [Reported by Greg Kurz]
>
> 2. Fix issue with error_abort and error_propagate: when we wrap
> error_abort by local_err+error_propagate, the resulting coredump will
> refer to error_propagate and not to the place where error happened.
> (the macro itself doesn't fix the issue, but it allows us to [3.] drop
> the local_err+error_propagate pattern, which will definitely fix the
> issue) [Reported by Kevin Wolf]
>
> 3. Drop local_err+error_propagate pattern, which is used to workaround
> void functions with errp parameter, when caller wants to know resulting
> status. (Note: actually these functions could be merely updated to
> return int error code).
>
> To achieve these goals, later patches will add invocations
> of this macro at the start of functions with either use
> error_prepend/error_append_hint (solving 1) or which use
> local_err+error_propagate to check errors, switching those
> functions to use *errp instead (solving 2 and 3).
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Paul Durrant <paul@xen.org>
> Reviewed-by: Greg Kurz <groug@kaod.org>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> include/qapi/error.h | 205
> ++++++++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 173 insertions(+), 32 deletions(-)
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
- [PATCH v2 0/3] spapr: Improve error reporting in spapr_caps.c, Greg Kurz, 2020/06/11
- [PATCH v2 1/3] error: auto propagated local_err, Greg Kurz, 2020/06/11
- Re: [PATCH v2 1/3] error: auto propagated local_err,
Laurent Vivier <=
- [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Greg Kurz, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Laurent Vivier, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Greg Kurz, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Greg Kurz, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11
- Re: [PATCH v2 2/3] spapr: Use error_append_hint() in spapr_caps.c, Vladimir Sementsov-Ogievskiy, 2020/06/11