linux-kernel - Re: [PATCH] x86/mm: add select HAVE_ARCH_HUGE

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Message-ID: <22FE49E7-85C9-440C-8EA7-4651B08B6495@fb.com>
Date:   Tue, 24 Aug 2021 16:35:34 +0000
From:   Song Liu <songliubraving@...com>
To:     LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
        "hpa@...or.com" <hpa@...or.com>,
        "Linux Memory Management List" <linux-mm@...ck.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH] x86/mm: add select HAVE_ARCH_HUGE_VMALLOC in Kconfig



> On Aug 18, 2021, at 2:21 PM, Song Liu <songliubraving@...com> wrote:
> 
> Add "select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP", so that huge
> vmalloc is enabled for X86_64 || X86_PAE.
> 
> Signed-off-by: Song Liu <songliubraving@...com>

Ping...

Does this change make sense? In my tests on Intel CPU, vmalloc will not 
return 2MB page without this change. 

Thanks,
Song  

> ---
> arch/x86/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index a68bf2db0d3ea..6344c572555e0 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -154,6 +154,7 @@ config X86
> 	select HAVE_ACPI_APEI_NMI		if ACPI
> 	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
> 	select HAVE_ARCH_AUDITSYSCALL
> +	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP
> 	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
> 	select HAVE_ARCH_JUMP_LABEL
> 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
> -- 
> 2.30.2
>