[linyunsheng:page_frag_cache_v3 14/16] net/sched/em_meta.c:593:50: warning: passing argument 1 of 'page_frag_cache_page_offset' discards 'const' qualifier from pointer target type

[linyunsheng:page_frag_cache_v3 14/16] net/sched/em_meta.c:593:50: warning: passing argument 1 of 'page_frag_cache_page_offset' discards 'const' qualifier from pointer target type

[kernel test robot]

tree:   https://github.com/gestionlin/linux.git page_frag_cache_v3
head:   245e8a4d98fee0307884585dbeb3dbb7ee1bf8fa
commit: 49d60804ba15895c09e4b47eb20fdc8b56ed6878 [14/16] net: replace page_frag with page_frag_cache
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20240429/202404290155.OnljDQEa-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240429/202404290155.OnljDQEa-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404290155.OnljDQEa-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/sched/em_meta.c: In function 'meta_int_sk_sendmsg_off':
>> net/sched/em_meta.c:593:50: warning: passing argument 1 of 'page_frag_cache_page_offset' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     593 |         dst->value = page_frag_cache_page_offset(&sk->sk_frag);
         |                                                  ^~~~~~~~~~~~
   In file included from include/linux/skbuff.h:34,
                    from net/sched/em_meta.c:64:
   include/linux/page_frag_cache.h:41:80: note: expected 'struct page_frag_cache *' but argument is of type 'const struct page_frag_cache *'
      41 | static inline unsigned int page_frag_cache_page_offset(struct page_frag_cache *nc)
         |                                                        ~~~~~~~~~~~~~~~~~~~~~~~~^~


vim +593 net/sched/em_meta.c

   584	
   585	META_COLLECTOR(int_sk_sendmsg_off)
   586	{
   587		const struct sock *sk = skb_to_full_sk(skb);
   588	
   589		if (!sk) {
   590			*err = -1;
   591			return;
   592		}
 > 593		dst->value = page_frag_cache_page_offset(&sk->sk_frag);
   594	}
   595	

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