linux-kernel - Re: [PATCH] ceph: fix symbol versioning for ceph_monc_do

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Message-ID: <7bd07499-ac33-9659-0a8a-a3ddfa96f13d@suse.cz>
Date:   Fri, 26 Aug 2016 14:40:34 +0200
From:   Michal Marek <mmarek@...e.cz>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Sage Weil <sage@...hat.com>, Jan Beulich <jbeulich@...e.com>,
        Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, Alex Elder <elder@...aro.org>,
        ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ceph: fix symbol versioning for ceph_monc_do_statfs

On 2016-06-13 15:04, Arnd Bergmann wrote:
> The genksyms helper in the kernel cannot parse a type definition
> like "typeof(((type *)0)->keyfld)" that is used in the DEFINE_RB_FUNCS
> helper, causing the following EXPORT_SYMBOL() statement to be ignored
> when computing the crcs, and triggering a warning about this:
> 
> WARNING: "ceph_monc_do_statfs" [fs/ceph/ceph.ko] has no CRC

FYI, Nick fixed the genksyms state machine to cope with this syntax. See
commits

5c6f3225d00d kbuild: Regenerate genksyms lexer
4fab91605a6b kbuild: genksyms fix for typeof handling

in today's linux-next. So the workaround can eventually be reverted.

Michal