Messages in this thread | | | Date | Tue, 21 Dec 2021 22:31:54 +0800 | From | Carel Si <> | Subject | Re: [LKP] Re: [x86/mm/64] f154f29085: BUG:kernel_reboot-without-warning_in_boot_stage - clang KCOV? |
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Hi Boris,
On Fri, Dec 17, 2021 at 08:52:53PM +0800, Borislav Petkov wrote: > --- > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index 0083464de5e3..79b3d67addcc 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -384,7 +384,7 @@ void native_write_cr0(unsigned long val) > } > EXPORT_SYMBOL(native_write_cr0); > > -void native_write_cr4(unsigned long val) > +void __no_profile native_write_cr4(unsigned long val) > { > unsigned long bits_changed = 0; > > diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c > index 75acb6027a87..68d2b7f9a913 100644 > --- a/arch/x86/kernel/head64.c > +++ b/arch/x86/kernel/head64.c > @@ -483,7 +483,7 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) > /* Kill off the identity-map trampoline */ > reset_early_page_tables(); > > - __native_tlb_flush_global(native_read_cr4()); > + __native_tlb_flush_global(this_cpu_read(cpu_tlbstate.cr4)); > > clear_bss(); >
We tested your patch, it can fix the issue, thanks.
========================================================================================= compiler/kconfig/rootfs/sleep/tbox_group/testcase: clang-14/x86_64-randconfig-a013-20211207/debian-10.4-x86_64-20200603.cgz/1/vm-snb/boot
commit: 9de4999050 ("x86/realmode: Add comment for Global bit usage in trampoline_pgd") f154f29085 ("x86/mm/64: Flush global TLB on boot and AP bringup") d12ddfe498 ("fixup-for-f154f29085")
9de4999050b5f2e8 f154f290855b070cc94dd44ad25 d12ddfe498329a0967c008d8183 ---------------- --------------------------- --------------------------- fail:runs %reproduction fail:runs %reproduction fail:runs | | | | | :27 100% 27:27 0% :27 dmesg.BUG:kernel_reboot-without-warning_in_boot_stage
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