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SubjectRe: [LKP] Re: [x86/mm/64] f154f29085: BUG:kernel_reboot-without-warning_in_boot_stage - clang KCOV?
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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