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powerpc/64s/hash: Disable subpage_prot syscall by default 

The subpage_prot syscall was added for specialised system software
(Lx86) that has been discontinued for about 7 years, and is not thought
to be used elsewhere, so disable it by default.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200703011958.1166620-4-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-07-03 11:19:58 +10:00 committed by Michael Ellerman
parent 5c9fa16e8a
commit 63396ada80
3 changed files with 5 additions and 4 deletions
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7
arch/powerpc/Kconfig
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@ -833,13 +833,16 @@ config FORCE_MAX_ZONEORDER
this in mind when choosing a value for this option.
config PPC_SUBPAGE_PROT
bool "Support setting protections for 4k subpages"
bool "Support setting protections for 4k subpages (subpage_prot syscall)"
default n
depends on PPC_BOOK3S_64 && PPC_64K_PAGES
help
This option adds support for a system call to allow user programs
This option adds support for system call to allow user programs
to set access permissions (read/write, readonly, or no access)
on the 4k subpages of each 64k page.
If unsure, say N here.
config PPC_COPRO_BASE
bool

1
arch/powerpc/configs/powernv_defconfig
View File

@ -64,7 +64,6 @@ CONFIG_HWPOISON_INJECT=m
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
CONFIG_PPC_64K_PAGES=y
CONFIG_PPC_SUBPAGE_PROT=y
CONFIG_SCHED_SMT=y
CONFIG_PM=y
CONFIG_HOTPLUG_PCI=y

1
arch/powerpc/configs/pseries_defconfig
View File

@ -57,7 +57,6 @@ CONFIG_MEMORY_HOTREMOVE=y
CONFIG_KSM=y
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_PPC_64K_PAGES=y
CONFIG_PPC_SUBPAGE_PROT=y
CONFIG_SCHED_SMT=y
CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_RPA=m