tree: https://github.com/changbae/Linux-kernel adl-po-presilicon head: 6173b90dca1633db3ad2ddb01b0825969c0aa8e3 commit: ad6ee55fb46f489a6d97fa45dd92620b608d4dcf [9678/9999] x86/mm: Introduce _PAGE_COW config: i386-randconfig-m021-20200621 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/mm.h:95, from include/linux/kallsyms.h:12, from include/linux/bpf.h:21, from include/linux/bpf-cgroup.h:5, from include/linux/cgroup-defs.h:22, from include/linux/cgroup.h:28, from include/linux/memcontrol.h:13, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: arch/x86/include/asm/pgtable.h: In function 'pte_wrprotect': arch/x86/include/asm/pgtable.h:359:26: warning: left shift count >= width of type [-Wshift-count-overflow] 359 | _PAGE_BIT_DIRTY_HW << _PAGE_BIT_COW; | ^~ arch/x86/include/asm/pgtable.h: In function 'pmd_wrprotect': 485 | pmd.pmd |= (pmd.pmd & _PAGE_DIRTY_HW) >> | ^~~ | pud arch/x86/include/asm/pgtable.h:485:19: error: 'pmd_t' {aka 'struct <anonymous>'} has no member named 'pmd'; did you mean 'pud'? 485 | pmd.pmd |= (pmd.pmd & _PAGE_DIRTY_HW) >> | ^~~ | pud arch/x86/include/asm/pgtable.h: In function 'pud_wrprotect': 570 | pud.pud |= (pud.pud & _PAGE_DIRTY_HW) >> | ^~~ | p4d arch/x86/include/asm/pgtable.h:570:19: error: 'pud_t' {aka 'struct <anonymous>'} has no member named 'pud'; did you mean 'p4d'? 570 | pud.pud |= (pud.pud & _PAGE_DIRTY_HW) >> | ^~~ | p4d make[2]: *** [scripts/Makefile.build:100: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1148: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +485 arch/x86/include/asm/pgtable.h 475 476 static inline pmd_t pmd_wrprotect(pmd_t pmd) 477 { 478 /* 479 * Blindly clearing _PAGE_RW might accidentally create 480 * a shadow stack PMD (RW=0,Dirty=1). Move the hardware 481 * dirty value to the software bit. 482 */ 483 if (cpu_feature_enabled(X86_FEATURE_SHSTK) && 484 (_PAGE_BIT_COW < sizeof(pmd) * BITS_PER_BYTE)) { 486 _PAGE_BIT_DIRTY_HW << _PAGE_BIT_COW; 487 pmd = pmd_clear_flags(pmd, _PAGE_DIRTY_HW); 488 } 489 490 return pmd_clear_flags(pmd, _PAGE_RW); 491 } 492 493 static inline pmd_t pmd_mkdirty(pmd_t pmd) 494 { 495 pmdval_t dirty = _PAGE_DIRTY_HW; 496 497 /* Avoid creating (HW)Dirty=1,Write=0 PMDs */ 498 if (cpu_feature_enabled(X86_FEATURE_SHSTK) && !(pmd_flags(pmd) & _PAGE_RW)) 499 dirty = _PAGE_COW; 500 501 return pmd_set_flags(pmd, dirty | _PAGE_SOFT_DIRTY); 502 } 503 504 static inline pmd_t pmd_mkdirty_shstk(pmd_t pmd) 505 { 506 pmd = pmd_clear_flags(pmd, _PAGE_COW); 507 return pmd_set_flags(pmd, _PAGE_DIRTY_HW | _PAGE_SOFT_DIRTY); 508 } 509 510 static inline pmd_t pmd_mkdevmap(pmd_t pmd) 511 { 512 return pmd_set_flags(pmd, _PAGE_DEVMAP); 513 } 514 515 static inline pmd_t pmd_mkhuge(pmd_t pmd) 516 { 517 return pmd_set_flags(pmd, _PAGE_PSE); 518 } 519 520 static inline pmd_t pmd_mkyoung(pmd_t pmd) 521 { 522 return pmd_set_flags(pmd, _PAGE_ACCESSED); 523 } 524 525 static inline pmd_t pmd_mkwrite(pmd_t pmd) 526 { 527 if (cpu_feature_enabled(X86_FEATURE_SHSTK)) { 528 if (pmd_flags(pmd) & _PAGE_COW) { 529 pmd = pmd_clear_flags(pmd, _PAGE_COW); 530 pmd = pmd_set_flags(pmd, _PAGE_DIRTY_HW); 531 } 532 } 533 534 return pmd_set_flags(pmd, _PAGE_RW); 535 } 536 537 static inline pud_t pud_set_flags(pud_t pud, pudval_t set) 538 { 539 pudval_t v = native_pud_val(pud); 540 541 return native_make_pud(v | set); 542 } 543 544 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) 545 { 546 pudval_t v = native_pud_val(pud); 547 548 return native_make_pud(v & ~clear); 549 } 550 551 static inline pud_t pud_mkold(pud_t pud) 552 { 553 return pud_clear_flags(pud, _PAGE_ACCESSED); 554 } 555 556 static inline pud_t pud_mkclean(pud_t pud) 557 { 558 return pud_clear_flags(pud, _PAGE_DIRTY_BITS); 559 } 560 561 static inline pud_t pud_wrprotect(pud_t pud) 562 { 563 /* 564 * Blindly clearing _PAGE_RW might accidentally create 565 * a shadow stack PUD (RW=0,Dirty=1). Move the hardware 566 * dirty value to the software bit. 567 */ 568 if (cpu_feature_enabled(X86_FEATURE_SHSTK) && 569 (_PAGE_BIT_COW < sizeof(pud) * BITS_PER_BYTE)) { 571 _PAGE_BIT_DIRTY_HW << _PAGE_BIT_COW; 572 pud = pud_clear_flags(pud, _PAGE_DIRTY_HW); 573 } 574 575 return pud_clear_flags(pud, _PAGE_RW); 576 } 577 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org