Re: [Xen-devel] [PATCH v6 11/11] xen: introduce ERRP_AUTO_PROPAGATE

[Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>]

13.01.2020 11:57, Paul Durrant wrote:
> On Fri, 10 Jan 2020 at 19:42, Vladimir Sementsov-Ogievskiy
> <vsementsov@xxxxxxxxxxxxx> 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>
> 
> Acked-by: Paul Durrant <paul@xxxxxxx>
> 

Thanks!

-- 
Best regards,
Vladimir
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