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arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

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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().

Link: https://lkml.kernel.org/r/20230113171026.582290-5-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand
2023-01-13 18:10:04 +01:00
committed by Andrew Morton
parent 4a446b3dd3
commit 20aae9eff5
3 changed files with 34 additions and 7 deletions
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3
arch/arm/include/asm/pgtable-2level.h
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@@ -126,6 +126,9 @@
#define L_PTE_SHARED (_AT(pteval_t, 1) << 10) /* shared(v6), coherent(xsc3) */
#define L_PTE_NONE (_AT(pteval_t, 1) << 11)
/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
#define L_PTE_SWP_EXCLUSIVE L_PTE_RDONLY
/*
* These are the memory types, defined to be compatible with
* pre-ARMv6 CPUs cacheable and bufferable bits: n/a,n/a,C,B