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charset=us-ascii Content-Disposition: inline :::::: :::::: Manual check reason: "low confidence static check warning: arch/x86/kernel/cpu/mtrr/mtrr.c:650:33: sparse: sparse: self-comparison always evaluates to true" :::::: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Juergen Gross CC: "Borislav Petkov (AMD)" tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 9bacdd8996c77c42ca004440be610692275ff9d0 commit: 03409069520974361ffb510c725305239b78b39f x86/mtrr: Replace vendor tests in MTRR code date: 6 months ago :::::: branch date: 31 hours ago :::::: commit date: 6 months ago config: x86_64-randconfig-121-20231114 (https://download.01.org/0day-ci/archive/20231115/202311150717.3wStmMmM-lkp@intel.com/config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231115/202311150717.3wStmMmM-lkp@intel.com/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 | Closes: https://lore.kernel.org/r/202311150717.3wStmMmM-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) >> arch/x86/kernel/cpu/mtrr/mtrr.c:650:33: sparse: sparse: self-comparison always evaluates to true vim +650 arch/x86/kernel/cpu/mtrr/mtrr.c ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 600 ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 601 /** f6b980646b93a8 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 602 * mtrr_bp_init - initialize MTRRs on the boot CPU ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 603 * ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 604 * This needs to be called early; before any of the other CPUs are ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 605 * initialized (i.e. before smp_init()). ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 606 */ 9ef231a436fddb arch/i386/kernel/cpu/mtrr/main.c Sam Ravnborg 2007-07-21 607 void __init mtrr_bp_init(void) ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 608 { 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 609 bool generic_mtrrs = cpu_feature_enabled(X86_FEATURE_MTRR); 7882b69eb6cdf6 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-12-05 610 const char *why = "(not available)"; 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 611 unsigned long config, dummy; dbd51be026eaf8 arch/x86/kernel/cpu/mtrr/main.c Jaswinder Singh Rajput 2009-07-04 612 d053b481a5f16d arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 613 phys_hi_rsvd = GENMASK(31, boot_cpu_data.x86_phys_bits - 32); 95ffa2438d0e9c arch/x86/kernel/cpu/mtrr/main.c Yinghai Lu 2008-04-29 614 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 615 if (!generic_mtrrs && mtrr_state.enabled) { 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 616 /* 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 617 * Software overwrite of MTRR state, only for generic case. 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 618 * Note that X86_FEATURE_MTRR has been reset in this case. 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 619 */ 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 620 init_table(); 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 621 pr_info("MTRRs set to read-only\n"); 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 622 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 623 return; 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 624 } 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 625 29055dc7428746 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 626 if (generic_mtrrs) { ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 627 mtrr_if = &generic_mtrr_ops; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 628 } else { ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 629 switch (boot_cpu_data.x86_vendor) { ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 630 case X86_VENDOR_AMD: ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 631 /* Pre-Athlon (K6) AMD CPU MTRRs */ f6b980646b93a8 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 632 if (cpu_feature_enabled(X86_FEATURE_K6_MTRR)) f8bd9f25c98151 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 633 mtrr_if = &amd_mtrr_ops; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 634 break; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 635 case X86_VENDOR_CENTAUR: f6b980646b93a8 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 636 if (cpu_feature_enabled(X86_FEATURE_CENTAUR_MCR)) f8bd9f25c98151 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 637 mtrr_if = ¢aur_mtrr_ops; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 638 break; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 639 case X86_VENDOR_CYRIX: f6b980646b93a8 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 640 if (cpu_feature_enabled(X86_FEATURE_CYRIX_ARR)) f8bd9f25c98151 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 641 mtrr_if = &cyrix_mtrr_ops; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 642 break; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 643 default: ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 644 break; ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 645 } ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 646 } ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 647 2c15679e8687d5 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 648 if (mtrr_enabled()) { 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 649 /* Get the number of variable MTRR ranges. */ 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 @650 if (mtrr_if == &generic_mtrr_ops) 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 651 rdmsr(MSR_MTRRcap, config, dummy); 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 652 else 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 653 config = mtrr_if->var_regs; 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 654 num_var_ranges = config & MTRR_CAP_VCNT; 03409069520974 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 655 ^1da177e4c3f41 arch/i386/kernel/cpu/mtrr/main.c Linus Torvalds 2005-04-16 656 init_table(); 45fa71f19a2d73 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 657 if (mtrr_if == &generic_mtrr_ops) { f9626104a5b681 arch/x86/kernel/cpu/mtrr/main.c Luis R. Rodriguez 2015-05-26 658 /* BIOS may override */ 2c15679e8687d5 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 659 if (get_mtrr_state()) { adfe7512e1d0b2 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 660 memory_caching_control |= CACHE_MTRR; f6b980646b93a8 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2023-05-02 661 changed_by_mtrr_cleanup = mtrr_cleanup(); 2c15679e8687d5 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 662 } else { 2c15679e8687d5 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 663 mtrr_if = NULL; 7882b69eb6cdf6 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-12-05 664 why = "by BIOS"; 12031a624af781 arch/x86/kernel/cpu/mtrr/main.c Yinghai Lu 2008-05-02 665 } 95ffa2438d0e9c arch/x86/kernel/cpu/mtrr/main.c Yinghai Lu 2008-04-29 666 } 3b520b238e018e arch/i386/kernel/cpu/mtrr/main.c Shaohua Li 2005-07-07 667 } f9626104a5b681 arch/x86/kernel/cpu/mtrr/main.c Luis R. Rodriguez 2015-05-26 668 adfe7512e1d0b2 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-11-02 669 if (!mtrr_enabled()) 7882b69eb6cdf6 arch/x86/kernel/cpu/mtrr/mtrr.c Juergen Gross 2022-12-05 670 pr_info("MTRRs disabled %s\n", why); 3b520b238e018e arch/i386/kernel/cpu/mtrr/main.c Shaohua Li 2005-07-07 671 } 3b520b238e018e arch/i386/kernel/cpu/mtrr/main.c Shaohua Li 2005-07-07 672 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki