linux-kernel - Re: [PATCH 1/2 net-next] libceph: Use sruct_size() in ceph_create_snap

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Message-ID: <64403766-cc22-4dbe-b4b3-af3ad32fb9ea@wanadoo.fr>
Date: Sun, 19 May 2024 14:45:59 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: kernel test robot <lkp@...el.com>, Ilya Dryomov <idryomov@...il.com>,
 Xiubo Li <xiubli@...hat.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
 ceph-devel@...r.kernel.org
Subject: Re: [PATCH 1/2 net-next] libceph: Use sruct_size() in
 ceph_create_snap_context()

Le 19/05/2024 à 13:34, kernel test robot a écrit :
> Hi Christophe,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on net-next/main]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Christophe-JAILLET/libceph-Use-__counted_by-in-struct-ceph_snap_context/20240519-172142
> base:   net-next/main
> patch link:    https://lore.kernel.org/r/5b7c72bdb52703bbfa5511ed500aed4babde1308.1716109606.git.christophe.jaillet%40wanadoo.fr
> patch subject: [PATCH 1/2 net-next] libceph: Use sruct_size() in ceph_create_snap_context()
> config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20240519/202405191909.7qhhefnu-lkp@intel.com/config)
> compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240519/202405191909.7qhhefnu-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202405191909.7qhhefnu-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>     net/ceph/snapshot.c: In function 'ceph_create_snap_context':
>>> net/ceph/snapshot.c:32:25: error: implicit declaration of function 'sruct_size'; did you mean 'struct_size'? [-Werror=implicit-function-declaration]
>        32 |         snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);
>           |                         ^~~~~~~~~~
>           |                         struct_size
>>> net/ceph/snapshot.c:32:43: error: 'snaps' undeclared (first use in this function); did you mean 'snapc'?
>        32 |         snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);
>           |                                           ^~~~~
>           |                                           snapc
>     net/ceph/snapshot.c:32:43: note: each undeclared identifier is reported only once for each function it appears in
>     cc1: some warnings being treated as errors
> 
> 
> vim +32 net/ceph/snapshot.c
> 
>      11	
>      12	/*
>      13	 * Ceph snapshot contexts are reference counted objects, and the
>      14	 * returned structure holds a single reference.  Acquire additional
>      15	 * references with ceph_get_snap_context(), and release them with
>      16	 * ceph_put_snap_context().  When the reference count reaches zero
>      17	 * the entire structure is freed.
>      18	 */
>      19	
>      20	/*
>      21	 * Create a new ceph snapshot context large enough to hold the
>      22	 * indicated number of snapshot ids (which can be 0).  Caller has
>      23	 * to fill in snapc->seq and snapc->snaps[0..snap_count-1].
>      24	 *
>      25	 * Returns a null pointer if an error occurs.
>      26	 */
>      27	struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
>      28							gfp_t gfp_flags)
>      29	{
>      30		struct ceph_snap_context *snapc;
>      31	
>    > 32		snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);

Ouch!

this was build-tested, but I must have made a mistake when editing the 
patch file to add the "net-next".

Sorry about that.
I'll resend when the net-next branch will re-open.

CJ

>      33		if (!snapc)
>      34			return NULL;
>      35	
>      36		refcount_set(&snapc->nref, 1);
>      37		snapc->num_snaps = snap_count;
>      38	
>      39		return snapc;
>      40	}
>      41	EXPORT_SYMBOL(ceph_create_snap_context);
>      42	
>