subject:"net\/ipv4\/tcp_cong.c\:238\:24\: sparse\: sparse\: incorrect type in initializer \(different address spaces\)"

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

2023-12-04 Thread kernel test robot

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   33cc938e65a98f1d29d0a18403dbbee050dcad9a
commit: e188f3330a13df904d77003846eafd3edf99009d ARC: cmpxchg/xchg: rewrite as 
macros to make type safe
date:   2 years, 3 months ago
config: arc-randconfig-r123-20231117 
(https://download.01.org/0day-ci/archive/20231204/202312041926.teyyqdat-...@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce: 
(https://download.01.org/0day-ci/archive/20231204/202312041926.teyyqdat-...@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 
| Closes: 
https://lore.kernel.org/oe-kbuild-all/202312041926.teyyqdat-...@intel.com/

sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> [noderef] __rcu *_val_ @@ got struct tcp_congestion_ops *[assigned] ca @@
   net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops 
const [noderef] __rcu *_val_
   net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops 
*[assigned] ca
   net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment 
(different address spaces) @@ expected struct tcp_congestion_ops const 
*prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] 
_val_ @@
   net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops 
const *prev
   net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const 
[noderef] __rcu *[assigned] _val_

vim +238 net/ipv4/tcp_cong.c

317a76f9a44b43 Stephen Hemminger 2005-06-23  219  
317a76f9a44b43 Stephen Hemminger 2005-06-23  220  /* Used by sysctl to change 
default congestion control */
6670e152447732 Stephen Hemminger 2017-11-14  221  int 
tcp_set_default_congestion_control(struct net *net, const char *name)
317a76f9a44b43 Stephen Hemminger 2005-06-23  222  {
317a76f9a44b43 Stephen Hemminger 2005-06-23  223struct 
tcp_congestion_ops *ca;
6670e152447732 Stephen Hemminger 2017-11-14  224const struct 
tcp_congestion_ops *prev;
6670e152447732 Stephen Hemminger 2017-11-14  225int ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  226  
6670e152447732 Stephen Hemminger 2017-11-14  227rcu_read_lock();
6670e152447732 Stephen Hemminger 2017-11-14  228ca = 
tcp_ca_find_autoload(net, name);
6670e152447732 Stephen Hemminger 2017-11-14  229if (!ca) {
6670e152447732 Stephen Hemminger 2017-11-14  230ret = -ENOENT;
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  231} else if 
(!bpf_try_module_get(ca, ca->owner)) {
6670e152447732 Stephen Hemminger 2017-11-14  232ret = -EBUSY;
8d432592f30fcc Jonathon Reinhart 2021-05-01  233} else if (!net_eq(net, 
_net) &&
8d432592f30fcc Jonathon Reinhart 2021-05-01  234
!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
8d432592f30fcc Jonathon Reinhart 2021-05-01  235/* Only init 
netns can set default to a restricted algorithm */
8d432592f30fcc Jonathon Reinhart 2021-05-01  236ret = -EPERM;
6670e152447732 Stephen Hemminger 2017-11-14  237} else {
6670e152447732 Stephen Hemminger 2017-11-14 @238prev = 
xchg(>ipv4.tcp_congestion_control, ca);
6670e152447732 Stephen Hemminger 2017-11-14  239if (prev)
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  240
bpf_module_put(prev, prev->owner);
317a76f9a44b43 Stephen Hemminger 2005-06-23  241  
6670e152447732 Stephen Hemminger 2017-11-14  242ca->flags |= 
TCP_CONG_NON_RESTRICTED;
317a76f9a44b43 Stephen Hemminger 2005-06-23  243ret = 0;
317a76f9a44b43 Stephen Hemminger 2005-06-23  244}
6670e152447732 Stephen Hemminger 2017-11-14  245rcu_read_unlock();
317a76f9a44b43 Stephen Hemminger 2005-06-23  246  
317a76f9a44b43 Stephen Hemminger 2005-06-23  247return ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  248  }
317a76f9a44b43 Stephen Hemminger 2005-06-23  249  

:: The code at line 238 was first introduced by commit
:: 6670e152447732ba90626f36dfc015a13fbf150e tcp: Namespace-ify 
sysctl_tcp_default_congestion_control

:: TO: Stephen Hemminger 
:: CC: David S. Miller 

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

___
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

2022-08-27 Thread kernel test robot

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   10d4879f9ef01cc6190fafe4257d06f375bab92c
commit: e188f3330a13df904d77003846eafd3edf99009d ARC: cmpxchg/xchg: rewrite as 
macros to make type safe
date:   1 year ago
config: arc-randconfig-s041-20220828 
(https://download.01.org/0day-ci/archive/20220828/202208281216.awxruhll-...@intel.com/config)
compiler: arc-elf-gcc (GCC) 12.1.0
reproduce:
wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e188f3330a13df904d77003846eafd3edf99009d
git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e188f3330a13df904d77003846eafd3edf99009d
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc 
SHELL=/bin/bash net/ipv4/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot 

sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> [noderef] __rcu *_val_ @@ got struct tcp_congestion_ops *[assigned] ca @@
   net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops 
const [noderef] __rcu *_val_
   net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops 
*[assigned] ca
   net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment 
(different address spaces) @@ expected struct tcp_congestion_ops const 
*prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] 
_val_ @@
   net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops 
const *prev
   net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const 
[noderef] __rcu *[assigned] _val_

vim +238 net/ipv4/tcp_cong.c

317a76f9a44b43 Stephen Hemminger 2005-06-23  219  
317a76f9a44b43 Stephen Hemminger 2005-06-23  220  /* Used by sysctl to change 
default congestion control */
6670e152447732 Stephen Hemminger 2017-11-14  221  int 
tcp_set_default_congestion_control(struct net *net, const char *name)
317a76f9a44b43 Stephen Hemminger 2005-06-23  222  {
317a76f9a44b43 Stephen Hemminger 2005-06-23  223struct 
tcp_congestion_ops *ca;
6670e152447732 Stephen Hemminger 2017-11-14  224const struct 
tcp_congestion_ops *prev;
6670e152447732 Stephen Hemminger 2017-11-14  225int ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  226  
6670e152447732 Stephen Hemminger 2017-11-14  227rcu_read_lock();
6670e152447732 Stephen Hemminger 2017-11-14  228ca = 
tcp_ca_find_autoload(net, name);
6670e152447732 Stephen Hemminger 2017-11-14  229if (!ca) {
6670e152447732 Stephen Hemminger 2017-11-14  230ret = -ENOENT;
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  231} else if 
(!bpf_try_module_get(ca, ca->owner)) {
6670e152447732 Stephen Hemminger 2017-11-14  232ret = -EBUSY;
8d432592f30fcc Jonathon Reinhart 2021-05-01  233} else if (!net_eq(net, 
_net) &&
8d432592f30fcc Jonathon Reinhart 2021-05-01  234
!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
8d432592f30fcc Jonathon Reinhart 2021-05-01  235/* Only init 
netns can set default to a restricted algorithm */
8d432592f30fcc Jonathon Reinhart 2021-05-01  236ret = -EPERM;
6670e152447732 Stephen Hemminger 2017-11-14  237} else {
6670e152447732 Stephen Hemminger 2017-11-14 @238prev = 
xchg(>ipv4.tcp_congestion_control, ca);
6670e152447732 Stephen Hemminger 2017-11-14  239if (prev)
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  240
bpf_module_put(prev, prev->owner);
317a76f9a44b43 Stephen Hemminger 2005-06-23  241  
6670e152447732 Stephen Hemminger 2017-11-14  242ca->flags |= 
TCP_CONG_NON_RESTRICTED;
317a76f9a44b43 Stephen Hemminger 2005-06-23  243ret = 0;
317a76f9a44b43 Stephen Hemminger 2005-06-23  244}
6670e152447732 Stephen Hemminger 2017-11-14  245rcu_read_unlock();
317a76f9a44b43 Stephen Hemminger 2005-06-23  246  
317a76f9a44b43 Stephen Hemminger 2005-06-23  247return ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  248  }
317a76f9a44b43 Stephen Hemminger 2005-06-23  249  

:: The code at line 238 was first introduced by commit
:: 6670e152447732ba90626f36dfc015a13fbf150e tcp: Namespace-ify 
sysctl_tcp_default_

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

2022-07-15 Thread kernel test robot

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   9b59ec8d50a1f28747ceff9a4f39af5deba9540e
commit: e188f3330a13df904d77003846eafd3edf99009d ARC: cmpxchg/xchg: rewrite as 
macros to make type safe
date:   11 months ago
config: arc-allyesconfig 
(https://download.01.org/0day-ci/archive/20220716/202207160525.ya4hoipa-...@intel.com/config)
compiler: arceb-elf-gcc (GCC) 12.1.0
reproduce:
wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e188f3330a13df904d77003846eafd3edf99009d
git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e188f3330a13df904d77003846eafd3edf99009d
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc 
SHELL=/bin/bash net/ipv4/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot 


sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> [noderef] __rcu *_val_ @@ got struct tcp_congestion_ops *[assigned] ca @@
   net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops 
const [noderef] __rcu *_val_
   net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops 
*[assigned] ca
   net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment 
(different address spaces) @@ expected struct tcp_congestion_ops const 
*prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] 
_val_ @@
   net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops 
const *prev
   net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const 
[noderef] __rcu *[assigned] _val_

vim +238 net/ipv4/tcp_cong.c

317a76f9a44b43 Stephen Hemminger 2005-06-23  219  
317a76f9a44b43 Stephen Hemminger 2005-06-23  220  /* Used by sysctl to change 
default congestion control */
6670e152447732 Stephen Hemminger 2017-11-14  221  int 
tcp_set_default_congestion_control(struct net *net, const char *name)
317a76f9a44b43 Stephen Hemminger 2005-06-23  222  {
317a76f9a44b43 Stephen Hemminger 2005-06-23  223struct 
tcp_congestion_ops *ca;
6670e152447732 Stephen Hemminger 2017-11-14  224const struct 
tcp_congestion_ops *prev;
6670e152447732 Stephen Hemminger 2017-11-14  225int ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  226  
6670e152447732 Stephen Hemminger 2017-11-14  227rcu_read_lock();
6670e152447732 Stephen Hemminger 2017-11-14  228ca = 
tcp_ca_find_autoload(net, name);
6670e152447732 Stephen Hemminger 2017-11-14  229if (!ca) {
6670e152447732 Stephen Hemminger 2017-11-14  230ret = -ENOENT;
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  231} else if 
(!bpf_try_module_get(ca, ca->owner)) {
6670e152447732 Stephen Hemminger 2017-11-14  232ret = -EBUSY;
8d432592f30fcc Jonathon Reinhart 2021-05-01  233} else if (!net_eq(net, 
_net) &&
8d432592f30fcc Jonathon Reinhart 2021-05-01  234
!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
8d432592f30fcc Jonathon Reinhart 2021-05-01  235/* Only init 
netns can set default to a restricted algorithm */
8d432592f30fcc Jonathon Reinhart 2021-05-01  236ret = -EPERM;
6670e152447732 Stephen Hemminger 2017-11-14  237} else {
6670e152447732 Stephen Hemminger 2017-11-14 @238prev = 
xchg(>ipv4.tcp_congestion_control, ca);
6670e152447732 Stephen Hemminger 2017-11-14  239if (prev)
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  240
bpf_module_put(prev, prev->owner);
317a76f9a44b43 Stephen Hemminger 2005-06-23  241  
6670e152447732 Stephen Hemminger 2017-11-14  242ca->flags |= 
TCP_CONG_NON_RESTRICTED;
317a76f9a44b43 Stephen Hemminger 2005-06-23  243ret = 0;
317a76f9a44b43 Stephen Hemminger 2005-06-23  244}
6670e152447732 Stephen Hemminger 2017-11-14  245rcu_read_unlock();
317a76f9a44b43 Stephen Hemminger 2005-06-23  246  
317a76f9a44b43 Stephen Hemminger 2005-06-23  247return ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  248  }
317a76f9a44b43 Stephen Hemminger 2005-06-23  249  

:: The code at line 238 was first introduced by commit
:: 6670e152447732ba90626f36dfc015a13fbf150e tcp: Namespace-ify 
sysctl_tcp_default_congestio

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

2022-03-08 Thread kernel test robot

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   330f4c53d3c2d8b11d86ec03a964b86dc81452f5
commit: e188f3330a13df904d77003846eafd3edf99009d ARC: cmpxchg/xchg: rewrite as 
macros to make type safe
date:   7 months ago
config: arc-allmodconfig 
(https://download.01.org/0day-ci/archive/20220309/202203091427.dx5hvkdo-...@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce:
wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
# 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e188f3330a13df904d77003846eafd3edf99009d
git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e188f3330a13df904d77003846eafd3edf99009d
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc 
SHELL=/bin/bash net/ipv4/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot 


sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> [noderef] __rcu *_val_ @@ got struct tcp_congestion_ops *[assigned] ca @@
   net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops 
const [noderef] __rcu *_val_
   net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops 
*[assigned] ca
   net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment 
(different address spaces) @@ expected struct tcp_congestion_ops const 
*prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] 
_val_ @@
   net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops 
const *prev
   net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const 
[noderef] __rcu *[assigned] _val_

vim +238 net/ipv4/tcp_cong.c

317a76f9a44b43 Stephen Hemminger 2005-06-23  219  
317a76f9a44b43 Stephen Hemminger 2005-06-23  220  /* Used by sysctl to change 
default congestion control */
6670e152447732 Stephen Hemminger 2017-11-14  221  int 
tcp_set_default_congestion_control(struct net *net, const char *name)
317a76f9a44b43 Stephen Hemminger 2005-06-23  222  {
317a76f9a44b43 Stephen Hemminger 2005-06-23  223struct 
tcp_congestion_ops *ca;
6670e152447732 Stephen Hemminger 2017-11-14  224const struct 
tcp_congestion_ops *prev;
6670e152447732 Stephen Hemminger 2017-11-14  225int ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  226  
6670e152447732 Stephen Hemminger 2017-11-14  227rcu_read_lock();
6670e152447732 Stephen Hemminger 2017-11-14  228ca = 
tcp_ca_find_autoload(net, name);
6670e152447732 Stephen Hemminger 2017-11-14  229if (!ca) {
6670e152447732 Stephen Hemminger 2017-11-14  230ret = -ENOENT;
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  231} else if 
(!bpf_try_module_get(ca, ca->owner)) {
6670e152447732 Stephen Hemminger 2017-11-14  232ret = -EBUSY;
8d432592f30fcc Jonathon Reinhart 2021-05-01  233} else if (!net_eq(net, 
_net) &&
8d432592f30fcc Jonathon Reinhart 2021-05-01  234
!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
8d432592f30fcc Jonathon Reinhart 2021-05-01  235/* Only init 
netns can set default to a restricted algorithm */
8d432592f30fcc Jonathon Reinhart 2021-05-01  236ret = -EPERM;
6670e152447732 Stephen Hemminger 2017-11-14  237} else {
6670e152447732 Stephen Hemminger 2017-11-14 @238prev = 
xchg(>ipv4.tcp_congestion_control, ca);
6670e152447732 Stephen Hemminger 2017-11-14  239if (prev)
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  240
bpf_module_put(prev, prev->owner);
317a76f9a44b43 Stephen Hemminger 2005-06-23  241  
6670e152447732 Stephen Hemminger 2017-11-14  242ca->flags |= 
TCP_CONG_NON_RESTRICTED;
317a76f9a44b43 Stephen Hemminger 2005-06-23  243ret = 0;
317a76f9a44b43 Stephen Hemminger 2005-06-23  244}
6670e152447732 Stephen Hemminger 2017-11-14  245rcu_read_unlock();
317a76f9a44b43 Stephen Hemminger 2005-06-23  246  
317a76f9a44b43 Stephen Hemminger 2005-06-23  247return ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  248  }
317a76f9a44b43 Stephen Hemminger 2005-06-23  249  

:: The code at line 238 was first introduced by commit
:: 6670e152447732ba90626f36dfc015a13fbf150e tcp: Namespace-ify 
sysctl_tcp_default_congestion_control

:: TO: Stephen Hemminge

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

2021-12-04 Thread kernel test robot

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   bbef3c7a63d2a4cb0f3f839db9e767f168c5e348
commit: e188f3330a13df904d77003846eafd3edf99009d ARC: cmpxchg/xchg: rewrite as 
macros to make type safe
date:   3 months ago
config: arc-randconfig-s031-20211204 
(https://download.01.org/0day-ci/archive/20211205/202112050240.xh7o2mwa-...@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.2.0
reproduce:
wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
# 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e188f3330a13df904d77003846eafd3edf99009d
git remote add linus 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e188f3330a13df904d77003846eafd3edf99009d
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc 
SHELL=/bin/bash net/ipv4/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot 


sparse warnings: (new ones prefixed by >>)
>> net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> [noderef] __rcu *_val_ @@ got struct tcp_congestion_ops *[assigned] ca @@
   net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops 
const [noderef] __rcu *_val_
   net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops 
*[assigned] ca
>> net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment 
>> (different address spaces) @@ expected struct tcp_congestion_ops const 
>> *prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] 
>> _val_ @@
   net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops 
const *prev
   net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const 
[noderef] __rcu *[assigned] _val_

vim +238 net/ipv4/tcp_cong.c

317a76f9a44b43 Stephen Hemminger 2005-06-23  219  
317a76f9a44b43 Stephen Hemminger 2005-06-23  220  /* Used by sysctl to change 
default congestion control */
6670e152447732 Stephen Hemminger 2017-11-14  221  int 
tcp_set_default_congestion_control(struct net *net, const char *name)
317a76f9a44b43 Stephen Hemminger 2005-06-23  222  {
317a76f9a44b43 Stephen Hemminger 2005-06-23  223struct 
tcp_congestion_ops *ca;
6670e152447732 Stephen Hemminger 2017-11-14  224const struct 
tcp_congestion_ops *prev;
6670e152447732 Stephen Hemminger 2017-11-14  225int ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  226  
6670e152447732 Stephen Hemminger 2017-11-14  227rcu_read_lock();
6670e152447732 Stephen Hemminger 2017-11-14  228ca = 
tcp_ca_find_autoload(net, name);
6670e152447732 Stephen Hemminger 2017-11-14  229if (!ca) {
6670e152447732 Stephen Hemminger 2017-11-14  230ret = -ENOENT;
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  231} else if 
(!bpf_try_module_get(ca, ca->owner)) {
6670e152447732 Stephen Hemminger 2017-11-14  232ret = -EBUSY;
8d432592f30fcc Jonathon Reinhart 2021-05-01  233} else if (!net_eq(net, 
_net) &&
8d432592f30fcc Jonathon Reinhart 2021-05-01  234
!(ca->flags & TCP_CONG_NON_RESTRICTED)) {
8d432592f30fcc Jonathon Reinhart 2021-05-01  235/* Only init 
netns can set default to a restricted algorithm */
8d432592f30fcc Jonathon Reinhart 2021-05-01  236ret = -EPERM;
6670e152447732 Stephen Hemminger 2017-11-14  237} else {
6670e152447732 Stephen Hemminger 2017-11-14 @238prev = 
xchg(>ipv4.tcp_congestion_control, ca);
6670e152447732 Stephen Hemminger 2017-11-14  239if (prev)
0baf26b0fcd74b Martin KaFai Lau  2020-01-08  240
bpf_module_put(prev, prev->owner);
317a76f9a44b43 Stephen Hemminger 2005-06-23  241  
6670e152447732 Stephen Hemminger 2017-11-14  242ca->flags |= 
TCP_CONG_NON_RESTRICTED;
317a76f9a44b43 Stephen Hemminger 2005-06-23  243ret = 0;
317a76f9a44b43 Stephen Hemminger 2005-06-23  244}
6670e152447732 Stephen Hemminger 2017-11-14  245rcu_read_unlock();
317a76f9a44b43 Stephen Hemminger 2005-06-23  246  
317a76f9a44b43 Stephen Hemminger 2005-06-23  247return ret;
317a76f9a44b43 Stephen Hemminger 2005-06-23  248  }
317a76f9a44b43 Stephen Hemminger 2005-06-23  249  

:: The code at line 238 was first introduced by commit
:: 6670e152447732ba90626f36dfc015a13fbf150e tcp: Namespace-ify 
sysctl_tcp_default_c

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

net/ipv4/tcp_cong.c:238:24: sparse: sparse: incorrect type in initializer (different address spaces)

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