Commit 63396ada authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

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: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200703011958.1166620-4-npiggin@gmail.com
parent 5c9fa16e

arch/powerpc/Kconfig

+5 −2
Original line number Diff line number Diff line
@@ -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

arch/powerpc/configs/powernv_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -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

arch/powerpc/configs/pseries_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -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