linux-kernel - Re: [PATCH] mm: fix build failure with xtensa

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Date:   Tue, 10 Nov 2020 14:08:37 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org, ngupta@...are.org,
        sergey.senozhatsky.work@...il.com, sjenning@...ux.vnet.ibm.com,
        gregkh@...uxfoundation.org, arnd@...db.de,
        Stefan Agner <stefan@...er.ch>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] mm: fix build failure with xtensa

On Tue, 10 Nov 2020 22:01:51 +0000 Sudip Mukherjee <sudipm.mukherjee@...il.com> wrote:

> If CONFIG_ZSMALLOC is enabled with xtensa then the build fails with:
> mm/zsmalloc.c:43:10: fatal error: asm/sparsemem.h: No such file or directory
> 
> Disable CONFIG_ZSMALLOC for xtensa as xtensa arch has not defined
> sparsemem.h.
> 
> ...
>
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -698,7 +698,7 @@ config Z3FOLD
>  
>  config ZSMALLOC
>  	tristate "Memory allocator for compressed pages"
> -	depends on MMU
> +	depends on (MMU && !XTENSA)
>  	help
>  	  zsmalloc is a slab-based memory allocator designed to store
>  	  compressed RAM pages.  zsmalloc uses virtual memory mapping

Thanks.  I believe that Stefan is working on a more general solution
over in
https://lkml.kernel.org/r/bdfa44bf1c570b05d6c70898e2bbb0acf234ecdf.1604762181.git.stefan@agner.ch