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powerpc/uaccess: Don't set KUEP by default on book3s/32 

On book3s/32, KUEP is an heavy process as it requires to
set/unset the NX bit in each of the 12 user segments
everytime the kernel is entered/exited from/to user space.

Don't select KUEP by default on book3s/32.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1492bb150c1aaa53d99a604b49992e60ea20cd5f.1586962582.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2020-04-15 14:57:11 +00:00 committed by Michael Ellerman
parent 547e687b29
commit c3ba4dbbd1
1 changed files with 1 additions and 1 deletions
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arch/powerpc/platforms/Kconfig.cputype
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@ -377,7 +377,7 @@ config PPC_HAVE_KUEP
config PPC_KUEP
bool "Kernel Userspace Execution Prevention"
depends on PPC_HAVE_KUEP
default y
default y if !PPC_BOOK3S_32
help
Enable support for Kernel Userspace Execution Prevention (KUEP)