linux-kernel - Re: [PATCH v5 11/19] x86: LAM initialization

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Message-ID: <20250906222420.GBaLy0lL5lHcVlYU0C@fat_crate.local>
Date: Sun, 7 Sep 2025 00:24:20 +0200
From: Borislav Petkov <bp@...en8.de>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
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Subject: Re: [PATCH v5 11/19] x86: LAM initialization

On Mon, Aug 25, 2025 at 10:24:36PM +0200, Maciej Wieczor-Retman wrote:
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index bb57e93b4caf..756bd96c3b8b 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -763,6 +763,9 @@ void __init init_mem_mapping(void)
>  	probe_page_size_mask();
>  	setup_pcid();
>  
> +	if (boot_cpu_has(X86_FEATURE_LAM) && IS_ENABLED(CONFIG_KASAN_SW_TAGS))

cpu_feature_enabled()

> +		cr4_set_bits_and_update_boot(X86_CR4_LAM_SUP);
> +
>  #ifdef CONFIG_X86_64
>  	end = max_pfn << PAGE_SHIFT;
>  #else
> -- 

Also, for all your patches' subjects and text:

Pls read

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#patch-subject
https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#changelog

and fixup.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette