linux-kernel - [cip:linux-4.19.y-cip-rt-rebase 2065/9999] net/xfrm/xfrm_ipcomp.c:40:30: warning: 'ipcomp_scratches

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Date:   Fri, 17 Jun 2022 14:27:17 +0800
From:   kernel test robot <lkp@...el.com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Tom Zanussi <zanussi@...nel.org>
Subject: [cip:linux-4.19.y-cip-rt-rebase 2065/9999]
 net/xfrm/xfrm_ipcomp.c:40:30: warning: 'ipcomp_scratches_lock' defined but
 not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git linux-4.19.y-cip-rt-rebase
head:   4784425d57541175db8c44ceef091a8fb42e5c6f
commit: ad01e51437422285ac98eced7c7136b368bd2ffc [2065/9999] net: xfrm: fix compress vs decompress serialization
config: x86_64-randconfig-a015 (https://download.01.org/0day-ci/archive/20220617/202206171457.YUwoAiZH-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/commit/?id=ad01e51437422285ac98eced7c7136b368bd2ffc
        git remote add cip https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git
        git fetch --no-tags cip linux-4.19.y-cip-rt-rebase
        git checkout ad01e51437422285ac98eced7c7136b368bd2ffc
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash net/xfrm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from net/xfrm/xfrm_ipcomp.c:23:
>> net/xfrm/xfrm_ipcomp.c:40:30: warning: 'ipcomp_scratches_lock' defined but not used [-Wunused-const-variable=]
      40 | static DEFINE_LOCAL_IRQ_LOCK(ipcomp_scratches_lock);
         |                              ^~~~~~~~~~~~~~~~~~~~~
   include/linux/locallock.h:244:71: note: in definition of macro 'DEFINE_LOCAL_IRQ_LOCK'
     244 | #define DEFINE_LOCAL_IRQ_LOCK(lvar)             __typeof__(const int) lvar
         |                                                                       ^~~~


vim +/ipcomp_scratches_lock +40 net/xfrm/xfrm_ipcomp.c

  > 23	#include <linux/locallock.h>
    24	#include <linux/percpu.h>
    25	#include <linux/slab.h>
    26	#include <linux/smp.h>
    27	#include <linux/vmalloc.h>
    28	#include <net/ip.h>
    29	#include <net/ipcomp.h>
    30	#include <net/xfrm.h>
    31	
    32	struct ipcomp_tfms {
    33		struct list_head list;
    34		struct crypto_comp * __percpu *tfms;
    35		int users;
    36	};
    37	
    38	static DEFINE_MUTEX(ipcomp_resource_mutex);
    39	static void * __percpu *ipcomp_scratches;
  > 40	static DEFINE_LOCAL_IRQ_LOCK(ipcomp_scratches_lock);
    41	static int ipcomp_scratch_users;
    42	static LIST_HEAD(ipcomp_tfms_list);
    43	

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