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Fri, 4 Jun 2021 14:05:29 +0000 Received: from BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::d1a0:ed05:b9cc:e94d]) by BYAPR12MB3479.namprd12.prod.outlook.com ([fe80::d1a0:ed05:b9cc:e94d%7]) with mapi id 15.20.4173.033; Fri, 4 Jun 2021 14:05:29 +0000 X-SNPS-Relay: synopsys.com From: Vineet Gupta To: Mike Rapoport , Andrew Morton CC: Arnd Bergmann , Geert Uytterhoeven , Ivan Kokshaysky , Jonathan Corbet , Matt Turner , Mike Rapoport , Richard Henderson , "kexec@lists.infradead.org" , "linux-alpha@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-doc@vger.kernel.org" , "linux-ia64@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-m68k@lists.linux-m68k.org" , "linux-mips@vger.kernel.org" , "linux-mm@kvack.org" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-sh@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "linux-xtensa@linux-xtensa.org" , "linuxppc-dev@lists.ozlabs.org" , "sparclinux@vger.kernel.org" Subject: Re: [PATCH v2 2/9] arc: update comment about HIGHMEM implementation Thread-Topic: [PATCH v2 2/9] arc: update comment about HIGHMEM implementation Thread-Index: AQHXWQ3SLXGjgTsRn0u+dr1cGNF2WqsD4z2A Date: Fri, 4 Jun 2021 14:05:29 +0000 Message-ID: References: <20210604064916.26580-1-rppt@kernel.org> <20210604064916.26580-3-rppt@kernel.org> In-Reply-To: <20210604064916.26580-3-rppt@kernel.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/3/21 11:49 PM, Mike Rapoport wrote: > From: Mike Rapoport > > 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 Acked-by: Vineet Gupta 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); _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel