powerpc/8xx: Fix STRICT_KERNEL_RWX startup test failure
authorChristophe Leroy <christophe.leroy@c-s.fr>
Mon, 20 Apr 2020 05:37:42 +0000 (05:37 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 22 Apr 2020 10:23:41 +0000 (20:23 +1000)
commitb61c38baa98056d4802ff5be5cfb979efc2d0f7a
tree65d945fe4357e8c7b2cbe23c207fc48cb66f32c3
parent94c0b013c98583614e1ad911e8795ca36da34a85
powerpc/8xx: Fix STRICT_KERNEL_RWX startup test failure

WRITE_RO lkdtm test works.

But when selecting CONFIG_DEBUG_RODATA_TEST, the kernel reports
rodata_test: test data was not read only

This is because when rodata test runs, there are still old entries
in TLB.

Flush TLB after setting kernel pages RO or NX.

Fixes: d5f17ee96447 ("powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX")
Cc: stable@vger.kernel.org # v5.1+
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/485caac75f195f18c11eb077b0031fdd2bb7fb9e.1587361039.git.christophe.leroy@c-s.fr
arch/powerpc/mm/nohash/8xx.c