* Re: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
[not found] ` <20230113171026.582290-5-david@redhat.com>
@ 2023-01-13 17:38 ` Russell King (Oracle)
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From: Russell King (Oracle) @ 2023-01-13 17:38 UTC (permalink / raw)
To: David Hildenbrand
Cc: linux-ia64, linux-sh, Yang Shi, Peter Xu, linux-mips, linux-mm,
Nadav Amit, sparclinux, linux-riscv, Andrea Arcangeli, linux-s390,
linux-hexagon, x86, Hugh Dickins, linux-csky, Mike Rapoport,
Vlastimil Babka, Jason Gunthorpe, linux-snps-arc, linux-xtensa,
John Hubbard, linux-um, linux-m68k, openrisc, loongarch,
linux-arm-kernel, linux-parisc, linux-kernel, linux-alpha,
Andrew Morton, linuxppc-dev
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 <linux@armlinux.org.uk>
> Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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