tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge head: 55375ed5b1263df5a5fb64262ac50040ad097d92 commit: 6e777a2c216c7148be128e24b4def6dee1734dbd [125/147] x86/power: fix doc warnings in cpu.c config: i386-randconfig-a004-20210617 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commi... git remote add pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git git fetch --no-tags pm bleeding-edge git checkout 6e777a2c216c7148be128e24b4def6dee1734dbd # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +77 arch/x86/power/cpu.c 7a9c2dd08eadd5 arch/x86/power/cpu.c Chen Yu 2015-11-25 59 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 60 /** 6e777a2c216c71 arch/x86/power/cpu.c Baokun Li 2021-06-15 61 * __save_processor_statei() - Save CPU registers before creating a 6e777a2c216c71 arch/x86/power/cpu.c Baokun Li 2021-06-15 62 * hibernation image and before restoring 6e777a2c216c71 arch/x86/power/cpu.c Baokun Li 2021-06-15 63 * the memory state from it 6e777a2c216c71 arch/x86/power/cpu.c Baokun Li 2021-06-15 64 * @ctxt: Structure to store the registers contents in. 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 65 * 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 66 * NOTE: If there is a CPU register the modification of which by the 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 67 * boot kernel (ie. the kernel used for loading the hibernation image) 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 68 * might affect the operations of the restored target kernel (ie. the one 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 69 * saved in the hibernation image), then its contents must be saved by this 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 70 * function. In other words, if kernel A is hibernated and different 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 71 * kernel B is used for loading the hibernation image into memory, the 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 72 * kernel A's __save_processor_state() function must save all registers 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 73 * needed by kernel A, so that it can operate correctly after the resume 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 74 * regardless of what kernel B does in the meantime. 5c9c9bec0589be arch/x86/kernel/suspend_64.c Rafael J. Wysocki 2008-01-30 75 */ cae4595764cb3b arch/x86/kernel/suspend_64.c Jan Beulich 2008-01-30 76 static void __save_processor_state(struct saved_context *ctxt) ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 @77 { f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 78 #ifdef CONFIG_X86_32 f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 79 mtrr_save_fixed_ranges(NULL); f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 80 #endif ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 81 kernel_fpu_begin(); ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 82 ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 83 /* ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 84 * descriptor tables ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 85 */ f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 86 store_idt(&ctxt->idt); 090edbe23ff579 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 87 cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 88 /* cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 89 * We save it here, but restore it only in the hibernate case. cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 90 * For ACPI S3 resume, this is loaded via 'early_gdt_desc' in 64-bit cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 91 * mode in "secondary_startup_64". In 32-bit mode it is done via cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 92 * 'pmode_gdt' in wakeup_start. cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 93 */ cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 94 ctxt->gdt_desc.size = GDT_SIZE - 1; 69218e47994da6 arch/x86/power/cpu.c Thomas Garnier 2017-03-14 95 ctxt->gdt_desc.address = (unsigned long)get_cpu_gdt_rw(smp_processor_id()); cc456c4e7cac38 arch/x86/power/cpu.c Konrad Rzeszutek Wilk 2013-05-01 96 9d1c6e7c86ddc3 arch/x86/kernel/suspend_64.c Glauber de Oliveira Costa 2007-10-19 97 store_tr(ctxt->tr); ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 98 ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 99 /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */ ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 100 /* ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 101 * segment registers ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 102 */ f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 103 savesegment(gs, ctxt->gs); 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 104 #ifdef CONFIG_X86_64 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 105 savesegment(fs, ctxt->fs); 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 106 savesegment(ds, ctxt->ds); 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 107 savesegment(es, ctxt->es); ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 108 ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 109 rdmsrl(MSR_FS_BASE, ctxt->fs_base); 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 110 rdmsrl(MSR_GS_BASE, ctxt->kernelmode_gs_base); 7ee18d677989e9 arch/x86/power/cpu.c Andy Lutomirski 2017-12-14 111 rdmsrl(MSR_KERNEL_GS_BASE, ctxt->usermode_gs_base); 3ebad590560947 arch/x86_64/kernel/suspend.c Bernhard Kaindl 2007-05-02 112 mtrr_save_fixed_ranges(NULL); ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 113 f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 114 rdmsrl(MSR_EFER, ctxt->efer); f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 115 #endif f9ebbe53e79c59 arch/x86/power/cpu_64.c Sergio Luis 2009-04-28 116 ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 117 /* ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 118 * control registers ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 119 */ f51c94528a9bc7 arch/x86_64/kernel/suspend.c Glauber de Oliveira Costa 2007-07-22 120 ctxt->cr0 = read_cr0(); f51c94528a9bc7 arch/x86_64/kernel/suspend.c Glauber de Oliveira Costa 2007-07-22 121 ctxt->cr2 = read_cr2(); 6c690ee1039b25 arch/x86/power/cpu.c Andy Lutomirski 2017-06-12 122 ctxt->cr3 = __read_cr3(); 1ef55be16ed695 arch/x86/power/cpu.c Andy Lutomirski 2016-09-29 123 ctxt->cr4 = __read_cr4(); 85a0e7539781da arch/x86/power/cpu.c Ondrej Zary 2010-06-08 124 ctxt->misc_enable_saved = !rdmsrl_safe(MSR_IA32_MISC_ENABLE, 85a0e7539781da arch/x86/power/cpu.c Ondrej Zary 2010-06-08 125 &ctxt->misc_enable); 7a9c2dd08eadd5 arch/x86/power/cpu.c Chen Yu 2015-11-25 126 msr_save_context(ctxt); ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 127 } ^1da177e4c3f41 arch/x86_64/kernel/suspend.c Linus Torvalds 2005-04-16 128 :::::: The code at line 77 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org