powerpc/32s: Refactor update of user segment registers

Browse source

KUEP implements the update of user segment registers.

Move it into mmu-hash.h in order to use it from other places.

And inline kuep_lock() and kuep_unlock(). Inlining kuep_lock() is
important for system_call_exception(), otherwise system_call_exception()
has to save into stack the system call parameters that are used just
after, and doing that takes more instructions than kuep_lock() itself.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/24591ca480d14a62ef910e38a5273d551262c4a2.1622708530.git.christophe.leroy@csgroup.eu

...

This commit is contained in:

Christophe Leroy 2021-06-03 08:41:37 +00:00 • committed by Michael Ellerman

parent 91ec66719d

commit 91bb30822a

4 changed files with 49 additions and 41 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

21

arch/powerpc/include/asm/book3s/32/kup.h

View file

27

arch/powerpc/include/asm/book3s/32/mmu-hash.h

View file

5

arch/powerpc/include/asm/kup.h

View file

37

arch/powerpc/mm/book3s32/kuep.c

View file