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Date: Thu, 23 Jun 2022 02:47:58 +0800
From: kernel test robot <lkp@...el.com>
To: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michael Ellerman <mpe@...erman.id.au>,
Sasha Levin <sashal@...nel.org>
Subject: [stable:linux-5.10.y 499/6724] arch/powerpc/kernel/smp.c:1380:14:
error: variable 'ret' set but not used
Hi Srikar,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.10.y
head: 4f3fee72a74c88c9039ce0405a715f6221791d06
commit: e91077cf1780108dc586cedf1d19f65b44fa3870 [499/6724] powerpc/smp: Update cpu_core_map on all PowerPc systems
config: powerpc-pasemi_defconfig (https://download.01.org/0day-ci/archive/20220623/202206230232.8JS8X70r-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=e91077cf1780108dc586cedf1d19f65b44fa3870
git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
git fetch --no-tags stable linux-5.10.y
git checkout e91077cf1780108dc586cedf1d19f65b44fa3870
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
arch/powerpc/kernel/smp.c: In function 'add_cpu_to_masks':
>> arch/powerpc/kernel/smp.c:1380:14: error: variable 'ret' set but not used [-Werror=unused-but-set-variable]
1380 | bool ret;
| ^~~
cc1: all warnings being treated as errors
vim +/ret +1380 arch/powerpc/kernel/smp.c
b8a97cb4599cda Srikar Dronamraju 2020-09-21 1373
df52f6714071c4 Oliver O'Halloran 2017-06-29 1374 static void add_cpu_to_masks(int cpu)
df52f6714071c4 Oliver O'Halloran 2017-06-29 1375 {
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1376 struct cpumask *(*submask_fn)(int) = cpu_sibling_mask;
df52f6714071c4 Oliver O'Halloran 2017-06-29 1377 int first_thread = cpu_first_thread_sibling(cpu);
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1378 int chip_id = cpu_to_chip_id(cpu);
84dbf66c634720 Srikar Dronamraju 2020-10-19 1379 cpumask_var_t mask;
bf6476152a0a08 Srikar Dronamraju 2021-04-15 @1380 bool ret;
df52f6714071c4 Oliver O'Halloran 2017-06-29 1381 int i;
df52f6714071c4 Oliver O'Halloran 2017-06-29 1382
df52f6714071c4 Oliver O'Halloran 2017-06-29 1383 /*
df52f6714071c4 Oliver O'Halloran 2017-06-29 1384 * This CPU will not be in the online mask yet so we need to manually
df52f6714071c4 Oliver O'Halloran 2017-06-29 1385 * add it to it's own thread sibling mask.
df52f6714071c4 Oliver O'Halloran 2017-06-29 1386 */
df52f6714071c4 Oliver O'Halloran 2017-06-29 1387 cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
e91077cf178010 Srikar Dronamraju 2021-08-26 1388 cpumask_set_cpu(cpu, cpu_core_mask(cpu));
df52f6714071c4 Oliver O'Halloran 2017-06-29 1389
df52f6714071c4 Oliver O'Halloran 2017-06-29 1390 for (i = first_thread; i < first_thread + threads_per_core; i++)
df52f6714071c4 Oliver O'Halloran 2017-06-29 1391 if (cpu_online(i))
df52f6714071c4 Oliver O'Halloran 2017-06-29 1392 set_cpus_related(i, cpu, cpu_sibling_mask);
df52f6714071c4 Oliver O'Halloran 2017-06-29 1393
425752c63b6f3f Gautham R. Shenoy 2018-10-11 1394 add_cpu_to_smallcore_masks(cpu);
84dbf66c634720 Srikar Dronamraju 2020-10-19 1395
84dbf66c634720 Srikar Dronamraju 2020-10-19 1396 /* In CPU-hotplug path, hence use GFP_ATOMIC */
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1397 ret = alloc_cpumask_var_node(&mask, GFP_ATOMIC, cpu_to_node(cpu));
84dbf66c634720 Srikar Dronamraju 2020-10-19 1398 update_mask_by_l2(cpu, &mask);
2a636a56d2d396 Oliver O'Halloran 2017-06-29 1399
b8a97cb4599cda Srikar Dronamraju 2020-09-21 1400 if (has_coregroup_support())
84dbf66c634720 Srikar Dronamraju 2020-10-19 1401 update_coregroup_mask(cpu, &mask);
84dbf66c634720 Srikar Dronamraju 2020-10-19 1402
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1403 if (shared_caches)
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1404 submask_fn = cpu_l2_cache_mask;
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1405
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1406 /* Update core_mask with all the CPUs that are part of submask */
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1407 or_cpumasks_related(cpu, cpu, submask_fn, cpu_core_mask);
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1408
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1409 /* Skip all CPUs already part of current CPU core mask */
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1410 cpumask_andnot(mask, cpu_online_mask, cpu_core_mask(cpu));
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1411
e91077cf178010 Srikar Dronamraju 2021-08-26 1412 /* If chip_id is -1; limit the cpu_core_mask to within DIE*/
e91077cf178010 Srikar Dronamraju 2021-08-26 1413 if (chip_id == -1)
e91077cf178010 Srikar Dronamraju 2021-08-26 1414 cpumask_and(mask, mask, cpu_cpu_mask(cpu));
e91077cf178010 Srikar Dronamraju 2021-08-26 1415
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1416 for_each_cpu(i, mask) {
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1417 if (chip_id == cpu_to_chip_id(i)) {
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1418 or_cpumasks_related(cpu, i, submask_fn, cpu_core_mask);
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1419 cpumask_andnot(mask, mask, submask_fn(i));
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1420 } else {
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1421 cpumask_andnot(mask, mask, cpu_core_mask(i));
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1422 }
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1423 }
bf6476152a0a08 Srikar Dronamraju 2021-04-15 1424
84dbf66c634720 Srikar Dronamraju 2020-10-19 1425 free_cpumask_var(mask);
a8a5356cd511db Paul Mackerras 2013-08-12 1426 }
a8a5356cd511db Paul Mackerras 2013-08-12 1427
:::::: The code at line 1380 was first introduced by commit
:::::: bf6476152a0a084038b12b9d770e32717f54a6ab powerpc/smp: Reintroduce cpu_core_mask
:::::: TO: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
--
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