From: Christoph Hellwig <hch@lst.de>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>,
Dan Williams <dan.j.williams@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 0/6] Allow setting caching mode in arch_add_memory() for P2PDMA
Date: Mon, 9 Dec 2019 21:43:45 +0100 [thread overview]
Message-ID: <20191209204345.GA29265@lst.de> (raw)
In-Reply-To: <20191209191346.5197-1-logang@deltatee.com>
On Mon, Dec 09, 2019 at 12:13:40PM -0700, Logan Gunthorpe wrote:
> This changes is pretty routine for most of the arches: x86_64, s390, arm64
> and powerpc simply need to thread the pgprot through to where the page tables
> are setup. x86_32 unfortunately sets up the page tables at boot so
> must use _set_memory_prot() to change their caching mode. ia64 and sh
> don't appear to have an easy way to change the page tables so, for now
> at least, we just return -EINVAL on such mappings and thus they will
> not support P2PDMA memory until the work for this is done.
ia64 and sh don't support ZONE_DEVICE mappings anyway as far as I know.
This generally looks fine to me.
prev parent reply other threads:[~2019-12-09 20:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 19:13 [PATCH 0/6] Allow setting caching mode in arch_add_memory() for P2PDMA Logan Gunthorpe
2019-12-09 19:13 ` [PATCH 1/6] x86/mm: Thread pgprot_t through init_memory_mapping() Logan Gunthorpe
2019-12-09 19:13 ` [PATCH 2/6] x86/mm: Introduce _set_memory_prot() Logan Gunthorpe
2019-12-09 19:13 ` [PATCH 3/6] powerpc/mm: Thread pgprot_t through create_section_mapping() Logan Gunthorpe
2019-12-09 19:13 ` [PATCH 4/6] s390/mm: Thread pgprot_t through vmem_add_mapping() Logan Gunthorpe
2019-12-09 19:13 ` [PATCH 5/6] mm, memory_hotplug: Provide argument for the pgprot_t in arch_add_memory() Logan Gunthorpe
2019-12-09 19:23 ` David Hildenbrand
2019-12-09 20:24 ` Logan Gunthorpe
2019-12-09 20:41 ` Michal Hocko
2019-12-09 21:00 ` Dan Williams
2019-12-09 21:27 ` Logan Gunthorpe
2019-12-09 21:24 ` Logan Gunthorpe
2019-12-10 9:56 ` Michal Hocko
2019-12-09 20:43 ` Dan Williams
2019-12-09 20:52 ` David Hildenbrand
2019-12-10 10:04 ` Michal Hocko
2019-12-10 10:09 ` David Hildenbrand
2019-12-10 10:34 ` Michal Hocko
2019-12-10 11:25 ` David Hildenbrand
2019-12-10 23:52 ` Logan Gunthorpe
2019-12-11 8:37 ` Michal Hocko
2019-12-09 19:13 ` [PATCH 6/6] mm/memremap: Set caching mode for PCI P2PDMA memory to WC Logan Gunthorpe
2019-12-09 20:43 ` Christoph Hellwig [this message]
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