[jimc:m-5 13/146] net/netfilter/nf_tables_api.c:176:1: sparse: sparse: symbol 'nft_trans_scratchpad_key' was not declared. Should it be static?

Hi Jim,

First bad commit (maybe != root cause):

tree:   https://github.com/jimc/linux.git m-5
head:   f4586ca88dc640ffb7dea6725f1b347cd3c51bf9
commit: 1f87b3b4c4b26b883edad107c44f67ef290f0736 [13/146] lib/folio_pool: Add folio_scratchpad_discard and folio_scratchpad_trim primitives
config: x86_64-randconfig-r134-20260819 (https://download.01.org/0day-ci/archive/20260820/[email protected]/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260820/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
>> net/netfilter/nf_tables_api.c:176:1: sparse: sparse: symbol 'nft_trans_scratchpad_key' was not declared. Should it be static?
   net/netfilter/nf_tables_api.c:2153:25: sparse: sparse: cast between address spaces (__percpu -> __rcu)
   net/netfilter/nf_tables_api.c:2153:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/netfilter/nf_tables_api.c:2153:25: sparse:    struct nft_stats [noderef] __rcu *
   net/netfilter/nf_tables_api.c:2153:25: sparse:    struct nft_stats [noderef] __percpu *
   net/netfilter/nf_tables_api.c:2356:17: sparse: sparse: cast between address spaces (__percpu -> __rcu)
   net/netfilter/nf_tables_api.c:2356:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/netfilter/nf_tables_api.c:2356:17: sparse:    struct nft_stats [noderef] __rcu *
   net/netfilter/nf_tables_api.c:2356:17: sparse:    struct nft_stats [noderef] __percpu *
   net/netfilter/nf_tables_api.c:2356:17: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/netfilter/nf_tables_api.c:2356:17: sparse:    struct nft_stats [noderef] __rcu *
   net/netfilter/nf_tables_api.c:2356:17: sparse:    struct nft_stats [noderef] __percpu *
   net/netfilter/nf_tables_api.c:2397:21: sparse: sparse: cast between address spaces (__percpu -> __rcu)
   net/netfilter/nf_tables_api.c:2397:21: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/netfilter/nf_tables_api.c:2397:21: sparse:    struct nft_stats [noderef] __rcu *
   net/netfilter/nf_tables_api.c:2397:21: sparse:    struct nft_stats [noderef] __percpu *
   net/netfilter/nf_tables_api.c:2806:25: sparse: sparse: cast between address spaces (__percpu -> __rcu)
   net/netfilter/nf_tables_api.c:2806:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
   net/netfilter/nf_tables_api.c:2806:25: sparse:    struct nft_stats [noderef] __rcu *
   net/netfilter/nf_tables_api.c:2806:25: sparse:    struct nft_stats [noderef] __percpu *

vim +/nft_trans_scratchpad_key +176 net/netfilter/nf_tables_api.c

7c95f6d866d8612 Pablo Neira Ayuso 2014-04-04  175  
8617fdbcbac6d40 Jim Cromie        2026-08-14 @176  DEFINE_FOLIO_POOL_STATIC_KEY_PARAM(nft_trans_scratchpad_key, trans_scratchpad,
8617fdbcbac6d40 Jim Cromie        2026-08-14  177  				   "Toggle nf_tables transaction folio scratchpad allocator");
8617fdbcbac6d40 Jim Cromie        2026-08-14  178  

:::::: The code at line 176 was first introduced by commit
:::::: 8617fdbcbac6d400488b7c147ad71cffeb71d163 netfilter/nf_tables: Add folio_scratchpad collector to struct nftables_pernet

:::::: TO: Jim Cromie <[email protected]>
:::::: CC: Jim Cromie <[email protected]>

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