tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: c129df6fe938fddc83fddea6a1976cd18573b095 commit: b55756d8f2c3e005e73aa59652dae1e528956862 [15256/23932] arm64/mpam: Implement helpers for handling configuration and monitoring config: arm64-randconfig-001-20241029 (https://download.01.org/0day-ci/archive/20241101/202411011311.9dahsLh5-lkp@i...) compiler: aarch64-linux-gcc (GCC) 14.1.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241101/202411011311.9dahsLh5-lkp@i...) 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/202411011311.9dahsLh5-lkp@intel.com/ All warnings (new ones prefixed by >>): arch/arm64/kernel/mpam/mpam_device.c:520:24: warning: no previous prototype for 'mpam_component_get' [-Wmissing-prototypes] 520 | struct mpam_component *mpam_component_get(struct mpam_class *class, int id, | ^~~~~~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c:612:1: warning: no previous prototype for '__mpam_device_create' [-Wmissing-prototypes] 612 | __mpam_device_create(u8 level_idx, enum mpam_class_types type, | ^~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c:692:12: warning: no previous prototype for 'mpam_discovery_start' [-Wmissing-prototypes] 692 | int __init mpam_discovery_start(void) | ^~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c:918:12: warning: no previous prototype for 'mpam_discovery_complete' [-Wmissing-prototypes] 918 | int __init mpam_discovery_complete(void) | ^~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c:935:13: warning: no previous prototype for 'mpam_discovery_failed' [-Wmissing-prototypes] 935 | void __init mpam_discovery_failed(void) | ^~~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/include/asm/atomic.h:34, from include/linux/atomic.h:7, from include/asm-generic/bitops/atomic.h:5, from arch/arm64/include/asm/bitops.h:37, from include/linux/bitops.h:19, from include/linux/kernel.h:11, from include/asm-generic/bug.h:18, from arch/arm64/include/asm/bug.h:37, from include/linux/bug.h:5, from include/linux/io.h:23, from arch/arm64/kernel/mpam/mpam_device.c:29: In function '__cmpxchg_case_mb_4', inlined from '__cmpxchg_mb' at arch/arm64/include/asm/cmpxchg.h:143:1, inlined from 'mpam_cpu_online' at arch/arm64/kernel/mpam/mpam_device.c:891:8: arch/arm64/include/asm/atomic_lse.h:492:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'int[1]' [-Warray-bounds=] 492 | asm volatile( \ | ^~~ arch/arm64/include/asm/atomic_lse.h:523:1: note: in expansion of macro '__CMPXCHG_CASE' 523 | __CMPXCHG_CASE(w, , mb_4, al, "memory") | ^~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c: In function 'mpam_cpu_online': arch/arm64/kernel/mpam/mpam_device.c:73:12: note: object 'mpam_broken' of size 4 73 | static int mpam_broken; | ^~~~~~~~~~~ In function '__cmpxchg_case_mb_4', inlined from '__cmpxchg_mb' at arch/arm64/include/asm/cmpxchg.h:143:1, inlined from 'mpam_cpu_online' at arch/arm64/kernel/mpam/mpam_device.c:891:8: arch/arm64/include/asm/atomic_lse.h:492:9: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'int[1]' [-Warray-bounds=] 492 | asm volatile( \ | ^~~ arch/arm64/include/asm/atomic_lse.h:523:1: note: in expansion of macro '__CMPXCHG_CASE' 523 | __CMPXCHG_CASE(w, , mb_4, al, "memory") | ^~~~~~~~~~~~~~ arch/arm64/kernel/mpam/mpam_device.c: In function 'mpam_cpu_online': arch/arm64/kernel/mpam/mpam_device.c:73:12: note: object 'mpam_broken' of size 4 73 | static int mpam_broken; | ^~~~~~~~~~~

...

arch/arm64/kernel/mpam/mpam_device.c:1250: warning: Function parameter or member 'comp' not described in 'do_device_sync' arch/arm64/kernel/mpam/mpam_device.c:1250: warning: Function parameter or member 'sync_ctx' not described in 'do_device_sync'

vim +1250 arch/arm64/kernel/mpam/mpam_device.c 1242 1243 /** 1244 * in some cases/platforms the MSC register access is only possible with 1245 * the associated CPUs. And need to check if those CPUS are online before 1246 * accessing it. So we use those CPUs dev->online_affinity to apply config. 1247 */ 1248 static int do_device_sync(struct mpam_component *comp, 1249 struct mpam_device_sync *sync_ctx)

1250 { 1251 int cpu; 1252 struct mpam_device *dev; 1253 1254 lockdep_assert_cpus_held(); 1255 1256 cpu = get_cpu(); 1257 if (cpumask_test_cpu(cpu, &comp->fw_affinity)) 1258 mpam_component_device_sync(sync_ctx); 1259 put_cpu(); 1260 1261 /* 1262 * Find the set of other CPUs we need to run on to update 1263 * this component 1264 */ 1265 list_for_each_entry(dev, &comp->devices, comp_list) { 1266 if (sync_ctx->error) 1267 break; 1268 1269 if (cpumask_intersects(&dev->online_affinity, 1270 &sync_ctx->updated_on)) 1271 continue; 1272 1273 /* 1274 * This device needs the config applying, and hasn't been 1275 * reachable by any cpu so far. 1276 */ 1277 cpu = cpumask_any(&dev->online_affinity); 1278 smp_call_function_single(cpu, mpam_component_device_sync, 1279 sync_ctx, 1); 1280 } 1281 1282 return sync_ctx->error; 1283 } 1284

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