linux-kernel - Re: [PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc

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Date:   Wed, 8 Apr 2020 08:01:00 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, x86@...nel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laura Abbott <labbott@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Peter Zijlstra <peterz@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-hyperv@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/28] mm: only allow page table mappings for built-in
 zsmalloc

Hi,

On 4/8/20 4:59 AM, Christoph Hellwig wrote:
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 36949a9425b8..614cc786b519 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -702,7 +702,7 @@ config ZSMALLOC
>  
>  config ZSMALLOC_PGTABLE_MAPPING
>  	bool "Use page table mapping to access object in zsmalloc"
> -	depends on ZSMALLOC
> +	depends on ZSMALLOC=y

It's a bool so this shouldn't matter... not needed.

>  	help
>  	  By default, zsmalloc uses a copy-based object mapping method to
>  	  access allocations that span two pages. However, if a particular


-- 
~Randy