arch/mips/loongson64/cop2-ex.c:97:29: error: 'struct thread_struct' has no member named 'fpu'

From: kernel test robot
Date: Sun Aug 01 2021 - 23:43:39 EST

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Hi Huacai,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c7d102232649226a69dddd58a4942cf13cff4f7c
commit: f83e4f9896eff614d0f2547a561fa5f39f9cddde MIPS: Loongson-3: Add some unaligned instructions emulation
date: 1 year, 3 months ago
config: mips-randconfig-p001-20210731 (attached as .config)
compiler: mips64-linux-gcc (GCC) 10.3.0
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/torvalds/linux.git/commit/?id=f83e4f9896eff614d0f2547a561fa5f39f9cddde
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout f83e4f9896eff614d0f2547a561fa5f39f9cddde
# save the attached .config to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/loongson64/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

arch/mips/loongson64/cop2-ex.c: In function 'loongson_cu2_call':
arch/mips/loongson64/cop2-ex.c:44:15: error: implicit declaration of function '__is_fpu_owner'; did you mean 'is_fpu_owner'? [-Werror=implicit-function-declaration]
44 | fpu_owned = __is_fpu_owner();
| ^~~~~~~~~~~~~~
| is_fpu_owner
>> arch/mips/loongson64/cop2-ex.c:97:29: error: 'struct thread_struct' has no member named 'fpu'
97 | set_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:99:29: error: 'struct thread_struct' has no member named 'fpu'
99 | set_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:132:42: error: 'struct thread_struct' has no member named 'fpu'
132 | value_next = get_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:139:37: error: 'struct thread_struct' has no member named 'fpu'
139 | value = get_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:206:29: error: 'struct thread_struct' has no member named 'fpu'
206 | set_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:223:29: error: 'struct thread_struct' has no member named 'fpu'
223 | set_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:288:37: error: 'struct thread_struct' has no member named 'fpu'
288 | value = get_fpr64(current->thread.fpu.fpr,
| ^
arch/mips/loongson64/cop2-ex.c:307:37: error: 'struct thread_struct' has no member named 'fpu'
307 | value = get_fpr64(current->thread.fpu.fpr,
| ^
cc1: some warnings being treated as errors

vim +97 arch/mips/loongson64/cop2-ex.c

26
27 static int loongson_cu2_call(struct notifier_block *nfb, unsigned long action,
28 void *data)
29 {
30 unsigned int res, fpu_owned;
31 unsigned long ra, value, value_next;
32 union mips_instruction insn;
33 int fr = !test_thread_flag(TIF_32BIT_FPREGS);
34 struct pt_regs *regs = (struct pt_regs *)data;
35 void __user *addr = (void __user *)regs->cp0_badvaddr;
36 unsigned int __user *pc = (unsigned int __user *)exception_epc(regs);
37
38 ra = regs->regs[31];
39 __get_user(insn.word, pc);
40
41 switch (action) {
42 case CU2_EXCEPTION:
43 preempt_disable();
> 44 fpu_owned = __is_fpu_owner();
45 if (!fr)
46 set_c0_status(ST0_CU1 | ST0_CU2);
47 else
48 set_c0_status(ST0_CU1 | ST0_CU2 | ST0_FR);
49 enable_fpu_hazard();
50 KSTK_STATUS(current) |= (ST0_CU1 | ST0_CU2);
51 if (fr)
52 KSTK_STATUS(current) |= ST0_FR;
53 else
54 KSTK_STATUS(current) &= ~ST0_FR;
55 /* If FPU is owned, we needn't init or restore fp */
56 if (!fpu_owned) {
57 set_thread_flag(TIF_USEDFPU);
58 init_fp_ctx(current);
59 _restore_fp(current);
60 }
61 preempt_enable();
62
63 return NOTIFY_STOP; /* Don't call default notifier */
64
65 case CU2_LWC2_OP:
66 if (insn.loongson3_lswc2_format.ls == 0)
67 goto sigbus;
68
69 if (insn.loongson3_lswc2_format.fr == 0) { /* gslq */
70 if (!access_ok(addr, 16))
71 goto sigbus;
72
73 LoadDW(addr, value, res);
74 if (res)
75 goto fault;
76
77 LoadDW(addr + 8, value_next, res);
78 if (res)
79 goto fault;
80
81 regs->regs[insn.loongson3_lswc2_format.rt] = value;
82 regs->regs[insn.loongson3_lswc2_format.rq] = value_next;
83 compute_return_epc(regs);
84 } else { /* gslqc1 */
85 if (!access_ok(addr, 16))
86 goto sigbus;
87
88 lose_fpu(1);
89 LoadDW(addr, value, res);
90 if (res)
91 goto fault;
92
93 LoadDW(addr + 8, value_next, res);
94 if (res)
95 goto fault;
96
> 97 set_fpr64(current->thread.fpu.fpr,
98 insn.loongson3_lswc2_format.rt, value);
99 set_fpr64(current->thread.fpu.fpr,
100 insn.loongson3_lswc2_format.rq, value_next);
101 compute_return_epc(regs);
102 own_fpu(1);
103 }
104 return NOTIFY_STOP; /* Don't call default notifier */
105
106 case CU2_SWC2_OP:
107 if (insn.loongson3_lswc2_format.ls == 0)
108 goto sigbus;
109
110 if (insn.loongson3_lswc2_format.fr == 0) { /* gssq */
111 if (!access_ok(addr, 16))
112 goto sigbus;
113
114 /* write upper 8 bytes first */
115 value_next = regs->regs[insn.loongson3_lswc2_format.rq];
116
117 StoreDW(addr + 8, value_next, res);
118 if (res)
119 goto fault;
120 value = regs->regs[insn.loongson3_lswc2_format.rt];
121
122 StoreDW(addr, value, res);
123 if (res)
124 goto fault;
125
126 compute_return_epc(regs);
127 } else { /* gssqc1 */
128 if (!access_ok(addr, 16))
129 goto sigbus;
130
131 lose_fpu(1);
132 value_next = get_fpr64(current->thread.fpu.fpr,
133 insn.loongson3_lswc2_format.rq);
134
135 StoreDW(addr + 8, value_next, res);
136 if (res)
137 goto fault;
138
139 value = get_fpr64(current->thread.fpu.fpr,
140 insn.loongson3_lswc2_format.rt);
141
142 StoreDW(addr, value, res);
143 if (res)
144 goto fault;
145
146 compute_return_epc(regs);
147 own_fpu(1);
148 }
149 return NOTIFY_STOP; /* Don't call default notifier */
150
151 case CU2_LDC2_OP:
152 switch (insn.loongson3_lsdc2_format.opcode1) {
153 /*
154 * Loongson-3 overridden ldc2 instructions.
155 * opcode1 instruction
156 * 0x1 gslhx: load 2 bytes to GPR
157 * 0x2 gslwx: load 4 bytes to GPR
158 * 0x3 gsldx: load 8 bytes to GPR
159 * 0x6 gslwxc1: load 4 bytes to FPR
160 * 0x7 gsldxc1: load 8 bytes to FPR
161 */
162 case 0x1:
163 if (!access_ok(addr, 2))
164 goto sigbus;
165
166 LoadHW(addr, value, res);
167 if (res)
168 goto fault;
169
170 compute_return_epc(regs);
171 regs->regs[insn.loongson3_lsdc2_format.rt] = value;
172 break;
173 case 0x2:
174 if (!access_ok(addr, 4))
175 goto sigbus;
176
177 LoadW(addr, value, res);
178 if (res)
179 goto fault;
180
181 compute_return_epc(regs);
182 regs->regs[insn.loongson3_lsdc2_format.rt] = value;
183 break;
184 case 0x3:
185 if (!access_ok(addr, 8))
186 goto sigbus;
187
188 LoadDW(addr, value, res);
189 if (res)
190 goto fault;
191
192 compute_return_epc(regs);
193 regs->regs[insn.loongson3_lsdc2_format.rt] = value;
194 break;
195 case 0x6:
196 die_if_kernel("Unaligned FP access in kernel code", regs);
197 BUG_ON(!used_math());
198 if (!access_ok(addr, 4))
199 goto sigbus;
200
201 lose_fpu(1);
202 LoadW(addr, value, res);
203 if (res)
204 goto fault;
205
206 set_fpr64(current->thread.fpu.fpr,
207 insn.loongson3_lsdc2_format.rt, value);
208 compute_return_epc(regs);
209 own_fpu(1);
210
211 break;
212 case 0x7:
213 die_if_kernel("Unaligned FP access in kernel code", regs);
214 BUG_ON(!used_math());
215 if (!access_ok(addr, 8))
216 goto sigbus;
217
218 lose_fpu(1);
219 LoadDW(addr, value, res);
220 if (res)
221 goto fault;
222
223 set_fpr64(current->thread.fpu.fpr,
224 insn.loongson3_lsdc2_format.rt, value);
225 compute_return_epc(regs);
226 own_fpu(1);
227 break;
228
229 }
230 return NOTIFY_STOP; /* Don't call default notifier */
231
232 case CU2_SDC2_OP:
233 switch (insn.loongson3_lsdc2_format.opcode1) {
234 /*
235 * Loongson-3 overridden sdc2 instructions.
236 * opcode1 instruction
237 * 0x1 gsshx: store 2 bytes from GPR
238 * 0x2 gsswx: store 4 bytes from GPR
239 * 0x3 gssdx: store 8 bytes from GPR
240 * 0x6 gsswxc1: store 4 bytes from FPR
241 * 0x7 gssdxc1: store 8 bytes from FPR
242 */
243 case 0x1:
244 if (!access_ok(addr, 2))
245 goto sigbus;
246
247 compute_return_epc(regs);
248 value = regs->regs[insn.loongson3_lsdc2_format.rt];
249
250 StoreHW(addr, value, res);
251 if (res)
252 goto fault;
253
254 break;
255 case 0x2:
256 if (!access_ok(addr, 4))
257 goto sigbus;
258
259 compute_return_epc(regs);
260 value = regs->regs[insn.loongson3_lsdc2_format.rt];
261
262 StoreW(addr, value, res);
263 if (res)
264 goto fault;
265
266 break;
267 case 0x3:
268 if (!access_ok(addr, 8))
269 goto sigbus;
270
271 compute_return_epc(regs);
272 value = regs->regs[insn.loongson3_lsdc2_format.rt];
273
274 StoreDW(addr, value, res);
275 if (res)
276 goto fault;
277
278 break;
279
280 case 0x6:
281 die_if_kernel("Unaligned FP access in kernel code", regs);
282 BUG_ON(!used_math());
283
284 if (!access_ok(addr, 4))
285 goto sigbus;
286
287 lose_fpu(1);
288 value = get_fpr64(current->thread.fpu.fpr,
289 insn.loongson3_lsdc2_format.rt);
290
291 StoreW(addr, value, res);
292 if (res)
293 goto fault;
294
295 compute_return_epc(regs);
296 own_fpu(1);
297
298 break;
299 case 0x7:
300 die_if_kernel("Unaligned FP access in kernel code", regs);
301 BUG_ON(!used_math());
302
303 if (!access_ok(addr, 8))
304 goto sigbus;
305
306 lose_fpu(1);
307 value = get_fpr64(current->thread.fpu.fpr,
308 insn.loongson3_lsdc2_format.rt);
309
310 StoreDW(addr, value, res);
311 if (res)
312 goto fault;
313
314 compute_return_epc(regs);
315 own_fpu(1);
316
317 break;
318 }
319 return NOTIFY_STOP; /* Don't call default notifier */
320 }
321
322 return NOTIFY_OK; /* Let default notifier send signals */
323
324 fault:
325 /* roll back jump/branch */
326 regs->regs[31] = ra;
327 regs->cp0_epc = (unsigned long)pc;
328 /* Did we have an exception handler installed? */
329 if (fixup_exception(regs))
330 return NOTIFY_STOP; /* Don't call default notifier */
331
332 die_if_kernel("Unhandled kernel unaligned access", regs);
333 force_sig(SIGSEGV);
334
335 return NOTIFY_STOP; /* Don't call default notifier */
336
337 sigbus:
338 die_if_kernel("Unhandled kernel unaligned access", regs);
339 force_sig(SIGBUS);
340
341 return NOTIFY_STOP; /* Don't call default notifier */
342 }
343

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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