linux-kernel - Re: [PATCH] Convert BUG_ON to WARN_ON in bond

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Date:   Thu, 22 Jun 2017 10:14:31 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Jay Vosburgh <jay.vosburgh@...onical.com>
Cc:     Michael J Dilmore <michael.j.dilmore@...il.com>,
        David Miller <davem@...emloft.net>, vfalico@...il.com,
        andy@...yhouse.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, joe@...ches.com
Subject: Re: [PATCH] Convert BUG_ON to WARN_ON in bond_options.c

Jay Vosburgh <jay.vosburgh@...onical.com> writes:
> Michael J Dilmore <michael.j.dilmore@...il.com> wrote:
>
>>if (WARN_ON(!new_active_slave) {
>>    netdev_dbg("Can't add new active slave - pointer null");
>>    return ERROR_CODE
>>}
>
> 	In general, yes, but in this case, the condition should be
> impossible to hit, so BUG_ON seems appropriate.

If it really is impossible then you should simply remove the test. No
need to test for the impossible, is there?


Bjørn