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Thu, 02 Apr 2020 01:49:57 -0400 X-MC-Unique: CD6EhWq8N6yS2QZXFDCMhg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 381F38018A1; Thu, 2 Apr 2020 05:49:55 +0000 (UTC) Received: from dhcp-128-65.nay.redhat.com (ovpn-12-164.pek2.redhat.com [10.72.12.164]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 566DC99DFD; Thu, 2 Apr 2020 05:49:50 +0000 (UTC) Date: Thu, 2 Apr 2020 13:49:46 +0800 From: Dave Young To: James Morse Subject: Re: [PATCH 2/3] mm/memory_hotplug: Allow arch override of non boot memory resource names Message-ID: <20200402054946.GA97238@dhcp-128-65.nay.redhat.com> References: <20200326180730.4754-1-james.morse@arm.com> <20200326180730.4754-3-james.morse@arm.com> MIME-Version: 1.0 In-Reply-To: <20200326180730.4754-3-james.morse@arm.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200401_225006_564390_7D6CF6F9 X-CRM114-Status: GOOD ( 20.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: piliu@redhat.com, Anshuman Khandual , Catalin Marinas , Bhupesh Sharma , kexec@lists.infradead.org, linux-mm@kvack.org, Eric Biederman , Hari Bathini , Andrew Morton , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/26/20 at 06:07pm, James Morse wrote: > Memory added to the system by hotplug has a 'System RAM' resource created > for it. This is exposed to user-space via /proc/iomem. > > This poses problems for kexec on arm64. If kexec decides to place the > kernel in one of these newly onlined regions, the new kernel will find > itself booting from a region not described as memory in the firmware > tables. > > Arm64 doesn't have a structure like the e820 memory map that can be > re-written when memory is brought online. Instead arm64 uses the UEFI > memory map, or the memory node from the DT, sometimes both. We never > rewrite these. Could arm64 use similar way to update DT, or a cooked UEFI maps? Add pingfan in cc, he said ppc64 update the DT after a memremove thus it would be good to just redo a kexec load. Added Pingfan and Hari for comments and corrections. > > Allow an architecture to specify a different name for these hotplug > regions. > > Signed-off-by: James Morse > --- > mm/memory_hotplug.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 0a54ffac8c68..69b03dd7fc74 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -42,6 +42,10 @@ > #include "internal.h" > #include "shuffle.h" > > +#ifndef MEMORY_HOTPLUG_RES_NAME > +#define MEMORY_HOTPLUG_RES_NAME "System RAM" > +#endif > + > /* > * online_page_callback contains pointer to current page onlining function. > * Initially it is generic_online_page(). If it is required it could be > @@ -103,7 +107,7 @@ static struct resource *register_memory_resource(u64 start, u64 size) > { > struct resource *res; > unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; > - char *resource_name = "System RAM"; > + char *resource_name = MEMORY_HOTPLUG_RES_NAME; > > if (start + size > max_mem_size) > return ERR_PTR(-E2BIG); > -- > 2.25.1 > > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel