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

From: Vladimir Sementsov-Ogievskiy
Subject: Re: [PATCH v11 8/8] xen: introduce ERRP_AUTO_PROPAGATE
Date: Mon, 6 Jul 2020 10:55:28 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

04.07.2020 19:36, Philippe Mathieu-Daudé wrote:
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@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
  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.

Sorry for that! I really understand you, take a look at Markus's
"[PATCH v2 00/44] Less clumsy error checking", which I'm trying to review

Still, the patch exists in such form since
"[RFC v5 000/126] error: auto propagated local_err", where it was reviewed
by Anthony, and I suggested to split it, but it was not needed.
Unfortunately, I've dropped r-bs due to changes..

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@redhat.com>

Thanks a lot!

Best regards,

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