diff options
| author | David Hildenbrand <david@redhat.com> | 2023-01-13 18:10:11 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:33:08 -0800 |
| commit | b5c88f21531c3457e3e202817556b68171484e00 (patch) | |
| tree | 462764478d84eff07f06c19216cda8f388e2079e /arch/m68k | |
| parent | ed4154067a086c44608b08f55cceb2688b661750 (diff) | |
| download | lwn-b5c88f21531c3457e3e202817556b68171484e00.tar.gz lwn-b5c88f21531c3457e3e202817556b68171484e00.zip | |
microblaze/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the
type. Generic MM currently only uses 5 bits for the type
(MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused.
The shift by 2 when converting between PTE and arch-specific swap entry
makes the swap PTE layout a little bit harder to decipher.
While at it, drop the comment from paulus---copy-and-paste leftover from
powerpc where we actually have _PAGE_HASHPTE---and mask the type in
__swp_entry_to_pte() as well.
Link: https://lkml.kernel.org/r/20230113171026.582290-12-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/include/asm/mcf_pgtable.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h index 3f8f4d0e66dd..e573d7b649f7 100644 --- a/arch/m68k/include/asm/mcf_pgtable.h +++ b/arch/m68k/include/asm/mcf_pgtable.h @@ -46,8 +46,8 @@ #define _CACHEMASK040 (~0x060) #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ -/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ -#define _PAGE_SWP_EXCLUSIVE 0x080 +/* We borrow bit 24 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE CF_PAGE_NOCACHE /* * Externally used page protection values. |