linux-kernel - Re: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP

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Message-ID: <Y8GXF/AgLKgWQW5p@shell.armlinux.org.uk>
Date:   Fri, 13 Jan 2023 17:38:31 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Nadav Amit <namit@...are.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>, linux-mm@...ck.org,
        x86@...nel.org, linux-alpha@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org
Subject: Re: [PATCH mm-unstable v1 04/26] arm/mm: support
 __HAVE_ARCH_PTE_SWP_EXCLUSIVE

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@...linux.org.uk>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Thanks.

-- 
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