From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Russell King (Oracle)" Date: Fri, 13 Jan 2023 17:38:31 +0000 Subject: Re: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Message-Id: List-Id: References: <20230113171026.582290-1-david@redhat.com> <20230113171026.582290-5-david@redhat.com> In-Reply-To: <20230113171026.582290-5-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org On Fri, Jan 13, 2023 at 06:10:04PM +0100, David Hildenbrand wrote: > Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the > offset. This reduces the maximum swap space per file to 64 GiB (was 128 > GiB). > > While at it drop the PTE_TYPE_FAULT from __swp_entry_to_pte() which is > defined to be 0 and is rather confusing because we should be dealing > with "Linux PTEs" not "hardware PTEs". Also, properly mask the type in > __swp_entry(). > > Cc: Russell King > Signed-off-by: David Hildenbrand Reviewed-by: Russell King (Oracle) Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!