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From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Mike Rapoport <rppt@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Jonathan Corbet <corbet@lwn.net>,
	Matt Turner <mattst88@gmail.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Richard Henderson <rth@twiddle.net>,
	"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	"linux-alpha@vger.kernel.org" <linux-alpha@vger.kernel.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-m68k@lists.linux-m68k.org"
	<linux-m68k@lists.linux-m68k.org>,
	"linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>,
	"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
	"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
	"linux-snps-arc@lists.infradead.org" 
	<linux-snps-arc@lists.infradead.org>,
	"linux-xtensa@linux-xtensa.org" <linux-xtensa@linux-xtensa.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>
Subject: Re: [PATCH v2 2/9] arc: update comment about HIGHMEM implementation
Date: Fri, 4 Jun 2021 14:05:29 +0000	[thread overview]
Message-ID: <f8d4e27b-7b3e-8412-9897-ab3b6aed5725@synopsys.com> (raw)
In-Reply-To: <20210604064916.26580-3-rppt@kernel.org>

On 6/3/21 11:49 PM, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> Arc does not use DISCONTIGMEM to implement high memory, update the comment
> describing how high memory works to reflect this.
>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

Acked-by: Vineet Gupta <vgupta@synopsys.com>

Thx,
-Vineet

> ---
>   arch/arc/mm/init.c | 13 +++++--------
>   1 file changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
> index e2ed355438c9..397a201adfe3 100644
> --- a/arch/arc/mm/init.c
> +++ b/arch/arc/mm/init.c
> @@ -139,16 +139,13 @@ void __init setup_arch_memory(void)
>   
>   #ifdef CONFIG_HIGHMEM
>   	/*
> -	 * Populate a new node with highmem
> -	 *
>   	 * On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
> -	 * than addresses in normal ala low memory (0x8000_0000 based).
> +	 * than addresses in normal aka low memory (0x8000_0000 based).
>   	 * Even with PAE, the huge peripheral space hole would waste a lot of
> -	 * mem with single mem_map[]. This warrants a mem_map per region design.
> -	 * Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
> -	 *
> -	 * DISCONTIGMEM in turns requires multiple nodes. node 0 above is
> -	 * populated with normal memory zone while node 1 only has highmem
> +	 * mem with single contiguous mem_map[].
> +	 * Thus when HIGHMEM on ARC is enabled the memory map corresponding
> +	 * to the hole is freed and ARC specific version of pfn_valid()
> +	 * handles the hole in the memory map.
>   	 */
>   #ifdef CONFIG_DISCONTIGMEM
>   	node_set_online(1);


  reply	other threads:[~2021-06-04 14:05 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04  6:49 [PATCH v2 0/9] Remove DISCINTIGMEM memory model Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 1/9] alpha: remove DISCONTIGMEM and NUMA Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 2/9] arc: update comment about HIGHMEM implementation Mike Rapoport
2021-06-04 14:05   ` Vineet Gupta [this message]
2021-06-04  6:49 ` [PATCH v2 3/9] arc: remove support for DISCONTIGMEM Mike Rapoport
2021-06-04 14:07   ` Vineet Gupta
2021-06-04 14:49     ` Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 4/9] m68k: " Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 5/9] mm: remove CONFIG_DISCONTIGMEM Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 6/9] arch, mm: remove stale mentions of DISCONIGMEM Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 7/9] docs: remove description of DISCONTIGMEM Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 8/9] mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA Mike Rapoport
2021-06-07  8:53   ` Geert Uytterhoeven
2021-06-08  5:45     ` Mike Rapoport
2021-06-04  6:49 ` [PATCH v2 9/9] mm: replace CONFIG_FLAT_NODE_MEM_MAP with CONFIG_FLATMEM Mike Rapoport
2021-06-07  8:44 ` [PATCH v2 0/9] Remove DISCINTIGMEM memory model Geert Uytterhoeven
2021-06-09 11:30 ` Arnd Bergmann
2021-06-09 14:50   ` Mike Rapoport

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