Re: [PATCH v2] x86/vm86: Remove deprecated VM86 support
From: kernel test robot
Date: Thu May 28 2026 - 05:46:21 EST
Hi Ashwin,
kernel test robot noticed the following build errors:
[auto build test ERROR on v7.1-rc5]
[also build test ERROR on linus/master next-20260527]
[cannot apply to tip/x86/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Ashwin-Gundarapu/x86-vm86-Remove-deprecated-VM86-support/20260527-153401
base: v7.1-rc5
patch link: https://lore.kernel.org/r/19e6858d9db.3a90532342003.5043853571553507480%40zohomail.in
patch subject: [PATCH v2] x86/vm86: Remove deprecated VM86 support
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20260528/202605281749.4b3Hss7l-lkp@xxxxxxxxx/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260528/202605281749.4b3Hss7l-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/202605281749.4b3Hss7l-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
arch/x86/lib/insn-eval.c: In function 'get_segment_selector':
>> arch/x86/lib/insn-eval.c:380:40: error: invalid use of undefined type 'struct kernel_vm86_regs'
380 | return vm86regs->ds;
| ^~
arch/x86/lib/insn-eval.c:382:40: error: invalid use of undefined type 'struct kernel_vm86_regs'
382 | return vm86regs->es;
| ^~
arch/x86/lib/insn-eval.c:384:40: error: invalid use of undefined type 'struct kernel_vm86_regs'
384 | return vm86regs->fs;
| ^~
arch/x86/lib/insn-eval.c:386:40: error: invalid use of undefined type 'struct kernel_vm86_regs'
386 | return vm86regs->gs;
| ^~
--
arch/x86/kernel/process_32.c: In function 'release_thread':
>> arch/x86/kernel/process_32.c:108:9: error: implicit declaration of function 'release_vm86_irqs' [-Wimplicit-function-declaration]
108 | release_vm86_irqs(dead_task);
| ^~~~~~~~~~~~~~~~~
--
arch/x86/kernel/signal.c: In function 'handle_signal':
>> arch/x86/kernel/signal.c:261:17: error: implicit declaration of function 'save_v86_state' [-Wimplicit-function-declaration]
261 | save_v86_state((struct kernel_vm86_regs *) regs, VM86_SIGNAL);
| ^~~~~~~~~~~~~~
--
arch/x86/kernel/traps.c: In function 'do_trap_no_signal':
>> arch/x86/kernel/traps.c:289:30: error: implicit declaration of function 'handle_vm86_trap' [-Wimplicit-function-declaration]
289 | if (!handle_vm86_trap((struct kernel_vm86_regs *) regs,
| ^~~~~~~~~~~~~~~~
arch/x86/kernel/traps.c: In function '__exc_general_protection':
>> arch/x86/kernel/traps.c:927:17: error: implicit declaration of function 'handle_vm86_fault'; did you mean 'handle_mm_fault'? [-Wimplicit-function-declaration]
927 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
| ^~~~~~~~~~~~~~~~~
| handle_mm_fault
vim +380 arch/x86/lib/insn-eval.c
32d0b95300db03 Ricardo Neri 2017-10-27 323
32d0b95300db03 Ricardo Neri 2017-10-27 324 /**
32d0b95300db03 Ricardo Neri 2017-10-27 325 * get_segment_selector() - obtain segment selector
32d0b95300db03 Ricardo Neri 2017-10-27 326 * @regs: Register values as seen when entering kernel mode
32d0b95300db03 Ricardo Neri 2017-10-27 327 * @seg_reg_idx: Segment register index to use
32d0b95300db03 Ricardo Neri 2017-10-27 328 *
32d0b95300db03 Ricardo Neri 2017-10-27 329 * Obtain the segment selector from any of the CS, SS, DS, ES, FS, GS segment
32d0b95300db03 Ricardo Neri 2017-10-27 330 * registers. In CONFIG_X86_32, the segment is obtained from either pt_regs or
32d0b95300db03 Ricardo Neri 2017-10-27 331 * kernel_vm86_regs as applicable. In CONFIG_X86_64, CS and SS are obtained
32d0b95300db03 Ricardo Neri 2017-10-27 332 * from pt_regs. DS, ES, FS and GS are obtained by reading the actual CPU
32d0b95300db03 Ricardo Neri 2017-10-27 333 * registers. This done for only for completeness as in CONFIG_X86_64 segment
32d0b95300db03 Ricardo Neri 2017-10-27 334 * registers are ignored.
32d0b95300db03 Ricardo Neri 2017-10-27 335 *
32d0b95300db03 Ricardo Neri 2017-10-27 336 * Returns:
32d0b95300db03 Ricardo Neri 2017-10-27 337 *
32d0b95300db03 Ricardo Neri 2017-10-27 338 * Value of the segment selector, including null when running in
32d0b95300db03 Ricardo Neri 2017-10-27 339 * long mode.
32d0b95300db03 Ricardo Neri 2017-10-27 340 *
32d0b95300db03 Ricardo Neri 2017-10-27 341 * -EINVAL on error.
32d0b95300db03 Ricardo Neri 2017-10-27 342 */
32d0b95300db03 Ricardo Neri 2017-10-27 343 static short get_segment_selector(struct pt_regs *regs, int seg_reg_idx)
32d0b95300db03 Ricardo Neri 2017-10-27 344 {
32d0b95300db03 Ricardo Neri 2017-10-27 345 unsigned short sel;
32d0b95300db03 Ricardo Neri 2017-10-27 346
3a24a60854d2ef Brian Gerst 2022-03-25 347 #ifdef CONFIG_X86_64
32d0b95300db03 Ricardo Neri 2017-10-27 348 switch (seg_reg_idx) {
32d0b95300db03 Ricardo Neri 2017-10-27 349 case INAT_SEG_REG_IGNORE:
32d0b95300db03 Ricardo Neri 2017-10-27 350 return 0;
32d0b95300db03 Ricardo Neri 2017-10-27 351 case INAT_SEG_REG_CS:
32d0b95300db03 Ricardo Neri 2017-10-27 352 return (unsigned short)(regs->cs & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 353 case INAT_SEG_REG_SS:
32d0b95300db03 Ricardo Neri 2017-10-27 354 return (unsigned short)(regs->ss & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 355 case INAT_SEG_REG_DS:
32d0b95300db03 Ricardo Neri 2017-10-27 356 savesegment(ds, sel);
32d0b95300db03 Ricardo Neri 2017-10-27 357 return sel;
32d0b95300db03 Ricardo Neri 2017-10-27 358 case INAT_SEG_REG_ES:
32d0b95300db03 Ricardo Neri 2017-10-27 359 savesegment(es, sel);
32d0b95300db03 Ricardo Neri 2017-10-27 360 return sel;
32d0b95300db03 Ricardo Neri 2017-10-27 361 case INAT_SEG_REG_FS:
32d0b95300db03 Ricardo Neri 2017-10-27 362 savesegment(fs, sel);
32d0b95300db03 Ricardo Neri 2017-10-27 363 return sel;
32d0b95300db03 Ricardo Neri 2017-10-27 364 case INAT_SEG_REG_GS:
32d0b95300db03 Ricardo Neri 2017-10-27 365 savesegment(gs, sel);
32d0b95300db03 Ricardo Neri 2017-10-27 366 return sel;
32d0b95300db03 Ricardo Neri 2017-10-27 367 default:
32d0b95300db03 Ricardo Neri 2017-10-27 368 return -EINVAL;
32d0b95300db03 Ricardo Neri 2017-10-27 369 }
32d0b95300db03 Ricardo Neri 2017-10-27 370 #else /* CONFIG_X86_32 */
32d0b95300db03 Ricardo Neri 2017-10-27 371 struct kernel_vm86_regs *vm86regs = (struct kernel_vm86_regs *)regs;
32d0b95300db03 Ricardo Neri 2017-10-27 372
32d0b95300db03 Ricardo Neri 2017-10-27 373 if (v8086_mode(regs)) {
32d0b95300db03 Ricardo Neri 2017-10-27 374 switch (seg_reg_idx) {
32d0b95300db03 Ricardo Neri 2017-10-27 375 case INAT_SEG_REG_CS:
32d0b95300db03 Ricardo Neri 2017-10-27 376 return (unsigned short)(regs->cs & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 377 case INAT_SEG_REG_SS:
32d0b95300db03 Ricardo Neri 2017-10-27 378 return (unsigned short)(regs->ss & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 379 case INAT_SEG_REG_DS:
32d0b95300db03 Ricardo Neri 2017-10-27 @380 return vm86regs->ds;
32d0b95300db03 Ricardo Neri 2017-10-27 381 case INAT_SEG_REG_ES:
32d0b95300db03 Ricardo Neri 2017-10-27 382 return vm86regs->es;
32d0b95300db03 Ricardo Neri 2017-10-27 383 case INAT_SEG_REG_FS:
32d0b95300db03 Ricardo Neri 2017-10-27 384 return vm86regs->fs;
32d0b95300db03 Ricardo Neri 2017-10-27 385 case INAT_SEG_REG_GS:
32d0b95300db03 Ricardo Neri 2017-10-27 386 return vm86regs->gs;
32d0b95300db03 Ricardo Neri 2017-10-27 387 case INAT_SEG_REG_IGNORE:
32d0b95300db03 Ricardo Neri 2017-10-27 388 default:
32d0b95300db03 Ricardo Neri 2017-10-27 389 return -EINVAL;
32d0b95300db03 Ricardo Neri 2017-10-27 390 }
32d0b95300db03 Ricardo Neri 2017-10-27 391 }
32d0b95300db03 Ricardo Neri 2017-10-27 392
32d0b95300db03 Ricardo Neri 2017-10-27 393 switch (seg_reg_idx) {
32d0b95300db03 Ricardo Neri 2017-10-27 394 case INAT_SEG_REG_CS:
32d0b95300db03 Ricardo Neri 2017-10-27 395 return (unsigned short)(regs->cs & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 396 case INAT_SEG_REG_SS:
32d0b95300db03 Ricardo Neri 2017-10-27 397 return (unsigned short)(regs->ss & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 398 case INAT_SEG_REG_DS:
32d0b95300db03 Ricardo Neri 2017-10-27 399 return (unsigned short)(regs->ds & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 400 case INAT_SEG_REG_ES:
32d0b95300db03 Ricardo Neri 2017-10-27 401 return (unsigned short)(regs->es & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 402 case INAT_SEG_REG_FS:
32d0b95300db03 Ricardo Neri 2017-10-27 403 return (unsigned short)(regs->fs & 0xffff);
32d0b95300db03 Ricardo Neri 2017-10-27 404 case INAT_SEG_REG_GS:
3a24a60854d2ef Brian Gerst 2022-03-25 405 savesegment(gs, sel);
3a24a60854d2ef Brian Gerst 2022-03-25 406 return sel;
32d0b95300db03 Ricardo Neri 2017-10-27 407 case INAT_SEG_REG_IGNORE:
32d0b95300db03 Ricardo Neri 2017-10-27 408 default:
32d0b95300db03 Ricardo Neri 2017-10-27 409 return -EINVAL;
32d0b95300db03 Ricardo Neri 2017-10-27 410 }
32d0b95300db03 Ricardo Neri 2017-10-27 411 #endif /* CONFIG_X86_64 */
32d0b95300db03 Ricardo Neri 2017-10-27 412 }
32d0b95300db03 Ricardo Neri 2017-10-27 413
--
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