linux/arch
Russell Currey 1f9ad21c3b powerpc/mm: Implement set_memory() routines
The set_memory_{ro/rw/nx/x}() functions are required for
STRICT_MODULE_RWX, and are generally useful primitives to have.  This
implementation is designed to be generic across powerpc's many MMUs.
It's possible that this could be optimised to be faster for specific
MMUs.

This implementation does not handle cases where the caller is attempting
to change the mapping of the page it is executing from, or if another
CPU is concurrently using the page being altered.  These cases likely
shouldn't happen, but a more complex implementation with MMU-specific code
could safely handle them.

On hash, the linear mapping is not kept in the linux pagetable, so this
will not change the protection if used on that range. Currently these
functions are not used on the linear map so just WARN for now.

apply_to_existing_page_range() does not work on huge pages so for now
disallow changing the protection of huge pages.

[jpn: - Allow set memory functions to be used without Strict RWX
      - Hash: Disallow certain regions
      - Have change_page_attr() take function pointers to manipulate ptes
      - Radix: Add ptesync after set_pte_at()]

Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210609013431.9805-2-jniethe5@gmail.com
2021-06-21 21:13:20 +10:00
..
alpha Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
arc ARC: mm: Use max_high_pfn as a HIGHMEM zone border 2021-05-10 12:38:59 -07:00
arm xen/swiotlb: check if the swiotlb has already been initialized 2021-05-14 15:52:11 +02:00
arm64 xen: branch for v5.13-rc2 2021-05-16 09:39:04 -07:00
csky arch/csky patches for 5.13-rc1 2021-05-03 12:58:31 -07:00
h8300 arch: rearrange headers inclusion order in asm/bitops for m68k, sh and h8300 2021-05-06 19:24:11 -07:00
hexagon Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
ia64 Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
m68k Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
microblaze tracing updates for 5.13 2021-05-03 11:19:54 -07:00
mips Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
nds32 tracing updates for 5.13 2021-05-03 11:19:54 -07:00
nios2 Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-05-02 09:14:01 -07:00
openrisc drivers/char: remove /dev/kmem for good 2021-05-07 00:26:34 -07:00
parisc Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
powerpc powerpc/mm: Implement set_memory() routines 2021-06-21 21:13:20 +10:00
riscv riscv: remove unused handle_exception symbol 2021-05-06 09:40:16 -07:00
s390 Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
sh sh: Remove unused variable 2021-05-10 23:23:04 +02:00
sparc Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
um Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
x86 Two fixes for timers: 2021-05-16 09:42:13 -07:00
xtensa Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
.gitignore .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
Kconfig Add Landlock, a new LSM from Mickaël Salaün <mic@linux.microsoft.com> 2021-05-01 18:50:44 -07:00