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Wed, 09 Sep 2020 03:27:50 -0400 X-MC-Unique: wmxjCFgDOJOXtbArx4RHxQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AAA0618B9F0C; Wed, 9 Sep 2020 07:27:47 +0000 (UTC) Received: from [10.36.113.90] (ovpn-113-90.ams2.redhat.com [10.36.113.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id 29F6B1002D53; Wed, 9 Sep 2020 07:27:43 +0000 (UTC) Subject: Re: [PATCH v2 2/7] kernel/resource: move and rename IORESOURCE_MEM_DRIVER_MANAGED To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, Andrew Morton , Michal Hocko , Dan Williams , Jason Gunthorpe , Kees Cook , Ard Biesheuvel , Pankaj Gupta , Baoquan He , Wei Yang , Eric Biederman , Thomas Gleixner , kexec@lists.infradead.org References: <20200908201012.44168-1-david@redhat.com> <20200908201012.44168-3-david@redhat.com> <20200909071646.GC435421@kroah.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200909071646.GC435421@kroah.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Rspamd-Queue-Id: A745318086CD2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 09.09.20 09:16, Greg Kroah-Hartman wrote: > On Tue, Sep 08, 2020 at 10:10:07PM +0200, David Hildenbrand wrote: >> IORESOURCE_MEM_DRIVER_MANAGED currently uses an unused PnP bit, which = is >> always set to 0 by hardware. This is far from beautiful (and confusing= ), >> and the bit only applies to SYSRAM. So let's move it out of the >> bus-specific (PnP) defined bits. >> >> We'll add another SYSRAM specific bit soon. If we ever need more bits = for >> other purposes, we can steal some from "desc", or reshuffle/regroup wh= at we >> have. >> >> Cc: Andrew Morton >> Cc: Michal Hocko >> Cc: Dan Williams >> Cc: Jason Gunthorpe >> Cc: Kees Cook >> Cc: Ard Biesheuvel >> Cc: Pankaj Gupta >> Cc: Baoquan He >> Cc: Wei Yang >> Cc: Eric Biederman >> Cc: Thomas Gleixner >> Cc: Greg Kroah-Hartman >> Cc: kexec@lists.infradead.org >> Signed-off-by: David Hildenbrand >> --- >> include/linux/ioport.h | 4 +++- >> kernel/kexec_file.c | 2 +- >> mm/memory_hotplug.c | 4 ++-- >> 3 files changed, 6 insertions(+), 4 deletions(-) >> >> diff --git a/include/linux/ioport.h b/include/linux/ioport.h >> index 52a91f5fa1a36..d7620d7c941a0 100644 >> --- a/include/linux/ioport.h >> +++ b/include/linux/ioport.h >> @@ -58,6 +58,9 @@ struct resource { >> #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended type= s */ >> #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */ >> =20 >> +/* IORESOURCE_SYSRAM specific bits. */ >> +#define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detecte= d via a driver. */ >> + >=20 > Can't you use BIT() here? I could, but this will make it look different to all other IORESOURCE_* definitions? If so, we should change all existing definitions - however the ones spanning multiple bits might turn out rather ugly, like #define IORESOURCE_TYPE_BITS 0x00001f00 Thoughts? Thanks >=20 > thanks, >=20 > greg k-h >=20 --=20 Thanks, David / dhildenb