linux-kernel - Re: [PATCH 09/13] x86/kconfig/64: Enable popular MM options in the defconfig

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Message-ID: <20250614103915.GM2278213@noisy.programming.kicks-ass.net>
Date: Sat, 14 Jun 2025 12:39:15 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Ingo Molnar <mingo@...nel.org>, jannh@...gle.com,
	Kees Cook <keescook@...omium.org>
Cc: linux-kernel@...r.kernel.org, "H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Jürgen Groß <jgross@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	David Woodhouse <dwmw@...zon.co.uk>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Michal Marek <michal.lkml@...kovi.net>,
	Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH 09/13] x86/kconfig/64: Enable popular MM options in the
 defconfig

On Thu, May 15, 2025 at 03:27:15PM +0200, Ingo Molnar wrote:
> Since the x86 defconfig aims to be a distro kernel work-alike with
> fewer drivers and a shorter build time, enable the following
> MM options that are typically enabled on major Linux distributions:
> 
> - ACPI_HOTPLUG_MEMORY, ZSWAP, SLAB hardening, MEMORY_HOTPLUG,
>   MEMORY_HOTREMOVE, PAGE_REPORTING, KSM, higher DEFAULT_MMAP_MIN_ADDR,
>   MEMORY_FAILURE, HWPOISON_INJECT, TRANSPARENT_HUGEPAGE,
>   TRANSPARENT_HUGEPAGE_MADVISE, IDLE_PAGE_TRACKING, ZONE_DEVICE
>   DEVICE_PRIVATE, ANON_VMA_NAME, USERFAULTFD, multi-gen LRU.
> 
> Signed-off-by: Ingo Molnar <mingo@...nel.org>

> +CONFIG_KSM=y

Isn't this thing like a giant security fail?