linux

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David Hildenbrand 2bba2ffbe0 powerpc/nohash/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit and 64bit.

On 64bit, let's use MSB 56 (LSB 7), located right next to the page type. 
On 32bit, let's use LSB 2 to avoid stealing one bit from the swap offset.

There seems to be no real reason why these bits cannot be used for swap
PTEs.  The important part is that _PAGE_PRESENT and _PAGE_HASHPTE remain
0.

While at it, mask the type in __swp_entry() and remove _PAGE_BIT_SWAP_TYPE
from pte-e500.h: while it was used in 64bit code it was ignored in 32bit
code.

Link: https://lkml.kernel.org/r/20230113171026.582290-19-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2023-02-02 22:33:09 -08:00

boot

powerpc fixes for 6.2 #3

2023-01-15 07:09:41 -06:00

configs

USB/Thunderbolt driver changes for 6.2-rc1

2022-12-16 03:22:53 -08:00

crypto

treewide: use get_random_u32_below() instead of deprecated function

2022-11-18 02:15:15 +01:00

include

powerpc/nohash/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE