linux-kernel - Re: [PATCH 24/43] x86/mm/kaiser: Mark per-cpu data structures required for entry/exit

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Message-ID: <alpine.DEB.2.20.1711251807010.2316@nanos>
Date:   Sat, 25 Nov 2017 18:17:56 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 24/43] x86/mm/kaiser: Mark per-cpu data structures required
 for entry/exit

On Fri, 24 Nov 2017, Ingo Molnar wrote:
> diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
> index aab4fe9f49f8..300090d1c209 100644
> --- a/arch/x86/include/asm/desc.h
> +++ b/arch/x86/include/asm/desc.h
> @@ -46,7 +46,7 @@ struct gdt_page {
>  	struct desc_struct gdt[GDT_ENTRIES];
>  } __attribute__((aligned(PAGE_SIZE)));
>  
> -DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);
> +DECLARE_PER_CPU_PAGE_ALIGNED_USER_MAPPED(struct gdt_page, gdt_page);

This patch is obsolete. We have the alias mappings in the cpu_entry_area
already.

Thanks,

	tglx