arch/mips/kernel/smp-cps.c:165:37: sparse: sparse: cast removes address space '__iomem' of expression

From: kernel test robot
Date: Thu Dec 14 2023 - 07:07:52 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5bd7ef53ffe5ca580e93e74eb8c81ed191ddc4bd
commit: fea8826d5fdc4ff5c93e883a738597129614039c MIPS: smp-cps: Don't rely on CP0_CMGCRBASE
date: 10 months ago
config: mips-randconfig-r122-20231108 (https://download.01.org/0day-ci/archive/20231214/202312142008.8HExX4uH-lkp@xxxxxxxxx/config)
compiler: mips-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231214/202312142008.8HExX4uH-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312142008.8HExX4uH-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> arch/mips/kernel/smp-cps.c:165:37: sparse: sparse: cast removes address space '__iomem' of expression
arch/mips/kernel/smp-cps.c: note: in included file (through arch/mips/include/asm/mips-cps.h, arch/mips/include/asm/smp-ops.h, arch/mips/include/asm/smp.h, ...):
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:292:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:292:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:292:1: sparse: got void [noderef] __iomem *
arch/mips/kernel/smp-cps.c: note: in included file (through arch/mips/include/asm/mips-cps.h, arch/mips/include/asm/smp-ops.h, arch/mips/include/asm/smp.h, ...):
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cpc.h:149:1: sparse: expected void *
arch/mips/include/asm/mips-cpc.h:149:1: sparse: got void [noderef] __iomem *
arch/mips/kernel/smp-cps.c: note: in included file (through arch/mips/include/asm/mips-cps.h, arch/mips/include/asm/smp-ops.h, arch/mips/include/asm/smp.h, ...):
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void const volatile [noderef] __iomem *mem
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:152:1: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void * @@ got void [noderef] __iomem * @@
arch/mips/include/asm/mips-cm.h:152:1: sparse: expected void *
arch/mips/include/asm/mips-cm.h:152:1: sparse: got void [noderef] __iomem *
arch/mips/include/asm/mips-cm.h:131:1: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *mem @@ got void * @@

vim +/__iomem +165 arch/mips/kernel/smp-cps.c

118
119 static void __init cps_prepare_cpus(unsigned int max_cpus)
120 {
121 unsigned ncores, core_vpes, c, cca;
122 bool cca_unsuitable, cores_limited;
123 u32 *entry_code;
124
125 mips_mt_set_cpuoptions();
126
127 /* Detect whether the CCA is unsuited to multi-core SMP */
128 cca = read_c0_config() & CONF_CM_CMASK;
129 switch (cca) {
130 case 0x4: /* CWBE */
131 case 0x5: /* CWB */
132 /* The CCA is coherent, multi-core is fine */
133 cca_unsuitable = false;
134 break;
135
136 default:
137 /* CCA is not coherent, multi-core is not usable */
138 cca_unsuitable = true;
139 }
140
141 /* Warn the user if the CCA prevents multi-core */
142 cores_limited = false;
143 if (cca_unsuitable || cpu_has_dc_aliases) {
144 for_each_present_cpu(c) {
145 if (cpus_are_siblings(smp_processor_id(), c))
146 continue;
147
148 set_cpu_present(c, false);
149 cores_limited = true;
150 }
151 }
152 if (cores_limited)
153 pr_warn("Using only one core due to %s%s%s\n",
154 cca_unsuitable ? "unsuitable CCA" : "",
155 (cca_unsuitable && cpu_has_dc_aliases) ? " & " : "",
156 cpu_has_dc_aliases ? "dcache aliasing" : "");
157
158 /*
159 * Patch the start of mips_cps_core_entry to provide:
160 *
161 * s0 = kseg0 CCA
162 */
163 entry_code = (u32 *)&mips_cps_core_entry;
164 uasm_i_addiu(&entry_code, 16, 0, cca);
> 165 UASM_i_LA(&entry_code, 17, (long)mips_gcr_base);
166 BUG_ON((void *)entry_code > (void *)&mips_cps_core_entry_patch_end);
167 blast_dcache_range((unsigned long)&mips_cps_core_entry,
168 (unsigned long)entry_code);
169 bc_wback_inv((unsigned long)&mips_cps_core_entry,
170 (void *)entry_code - (void *)&mips_cps_core_entry);
171 __sync();
172
173 /* Allocate core boot configuration structs */
174 ncores = mips_cps_numcores(0);
175 mips_cps_core_bootcfg = kcalloc(ncores, sizeof(*mips_cps_core_bootcfg),
176 GFP_KERNEL);
177 if (!mips_cps_core_bootcfg) {
178 pr_err("Failed to allocate boot config for %u cores\n", ncores);
179 goto err_out;
180 }
181
182 /* Allocate VPE boot configuration structs */
183 for (c = 0; c < ncores; c++) {
184 core_vpes = core_vpe_count(0, c);
185 mips_cps_core_bootcfg[c].vpe_config = kcalloc(core_vpes,
186 sizeof(*mips_cps_core_bootcfg[c].vpe_config),
187 GFP_KERNEL);
188 if (!mips_cps_core_bootcfg[c].vpe_config) {
189 pr_err("Failed to allocate %u VPE boot configs\n",
190 core_vpes);
191 goto err_out;
192 }
193 }
194
195 /* Mark this CPU as booted */
196 atomic_set(&mips_cps_core_bootcfg[cpu_core(&current_cpu_data)].vpe_mask,
197 1 << cpu_vpe_id(&current_cpu_data));
198
199 return;
200 err_out:
201 /* Clean up allocations */
202 if (mips_cps_core_bootcfg) {
203 for (c = 0; c < ncores; c++)
204 kfree(mips_cps_core_bootcfg[c].vpe_config);
205 kfree(mips_cps_core_bootcfg);
206 mips_cps_core_bootcfg = NULL;
207 }
208
209 /* Effectively disable SMP by declaring CPUs not present */
210 for_each_possible_cpu(c) {
211 if (c == 0)
212 continue;
213 set_cpu_present(c, false);
214 }
215 }
216

--
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https://github.com/intel/lkp-tests/wiki

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