Re: [PATCH v11 8/8] xen: introduce ERRP_AUTO_PROPAGATE

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

On 7/3/20 11:08 AM, Vladimir Sementsov-Ogievskiy wrote:
> If we want to add some info to errp (by error_prepend() or
> error_append_hint()), we must use the ERRP_AUTO_PROPAGATE macro.
> Otherwise, this info will not be added when errp == &error_fatal
> (the program will exit prior to the error_append_hint() or
> error_prepend() call).  Fix such cases.
> 
> If we want to check error after errp-function call, we need to
> introduce local_err and then propagate it to errp. Instead, use
> ERRP_AUTO_PROPAGATE macro, benefits are:
> 1. No need of explicit error_propagate call
> 2. No need of explicit local_err variable: use errp directly
> 3. ERRP_AUTO_PROPAGATE leaves errp as is if it's not NULL or
>    &error_fatal, this means that we don't break error_abort
>    (we'll abort on error_set, not on error_propagate)
> 
> This commit is generated by command
> 
>     sed -n '/^X86 Xen CPUs$/,/^$/{s/^F: //p}' MAINTAINERS | \
>     xargs git ls-files | grep '\.[hc]$' | \
>     xargs spatch \
>         --sp-file scripts/coccinelle/auto-propagated-errp.cocci \
>         --macro-file scripts/cocci-macro-file.h \
>         --in-place --no-show-diff --max-width 80
> 
> Reported-by: Kevin Wolf <kwolf@xxxxxxxxxx>
> Reported-by: Greg Kurz <groug@xxxxxxxx>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>
> ---
>  hw/block/dataplane/xen-block.c |  17 +++---
>  hw/block/xen-block.c           | 102 ++++++++++++++-------------------
>  hw/pci-host/xen_igd_pt.c       |   7 +--
>  hw/xen/xen-backend.c           |   7 +--
>  hw/xen/xen-bus.c               |  92 +++++++++++++----------------
>  hw/xen/xen-host-pci-device.c   |  27 +++++----
>  hw/xen/xen_pt.c                |  25 ++++----
>  hw/xen/xen_pt_config_init.c    |  17 +++---
>  8 files changed, 128 insertions(+), 166 deletions(-)

Without the description, this patch has 800 lines of diff...
It killed me, I don't have the energy to review patch #7 of this
series after that, sorry.
Consider splitting such mechanical patches next time. Here it
could have been hw/block, hw/pci-host, hw/xen.

Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>