linux-kernel - Re: [PATCH] ceph: fix clang warning for CEPH_DEFINE_OID

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Date:   Fri, 22 Mar 2019 16:07:50 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ilya Dryomov <idryomov@...il.com>
Cc:     "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Alex Elder <elder@...aro.org>,
        Ceph Development <ceph-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ceph: fix clang warning for CEPH_DEFINE_OID_ONSTACK

On Fri, Mar 22, 2019 at 3:40 PM Ilya Dryomov <idryomov@...il.com> wrote:
>
> On Fri, Mar 22, 2019 at 3:08 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> Hi Arnd,
>
> I don't like this because the initialization is no longer contained to
> ceph_oid_init().  Now there are two things to patch instead of one.
>
> How is this going to be fixed in other places?

The only other warning like this that I encountered was in
DECLARE_WAIT_QUEUE_HEAD_ONSTACK().

So far, I have no idea for how to solve it, other than disabling
CONFIG_LOCKDEP when clang is used.

Would you prefer this version?

#define CEPH_OID_INITIALIZER(oid) { .name = (oid).inline_name }
#define CEPH_DEFINE_OID_ONSTACK(oid)                            \
        struct ceph_object_id oid = CEPH_OID_INITIALIZER(oid)

static inline void ceph_oid_init(struct ceph_object_id *oid)
{
        *oid = (struct ceph_object_id)CEPH_OID_INITIALIZER(*oid);
}




       Arnd