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-rw-r--r--arch/arm64/Kconfig69
1 files changed, 51 insertions, 18 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 440d906429de..7b10647cab22 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -48,6 +48,7 @@ config ARM64
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_BITREVERSE
select HAVE_ARCH_JUMP_LABEL
+ select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
@@ -169,10 +170,12 @@ config FIX_EARLYCON_MEM
config PGTABLE_LEVELS
int
+ default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
- default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
+ default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
+ default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
source "init/Kconfig"
@@ -389,25 +392,37 @@ config ARM64_4K_PAGES
help
This feature enables 4KB pages support.
+config ARM64_16K_PAGES
+ bool "16KB"
+ help
+ The system will use 16KB pages support. AArch32 emulation
+ requires applications compiled with 16K (or a multiple of 16K)
+ aligned segments.
+
config ARM64_64K_PAGES
bool "64KB"
help
This feature enables 64KB pages support (4KB by default)
allowing only two levels of page tables and faster TLB
- look-up. AArch32 emulation is not available when this feature
- is enabled.
+ look-up. AArch32 emulation requires applications compiled
+ with 64K aligned segments.
endchoice
choice
prompt "Virtual address space size"
default ARM64_VA_BITS_39 if ARM64_4K_PAGES
+ default ARM64_VA_BITS_47 if ARM64_16K_PAGES
default ARM64_VA_BITS_42 if ARM64_64K_PAGES
help
Allows choosing one of multiple possible virtual address
space sizes. The level of translation table is determined by
a combination of page size and virtual address space size.
+config ARM64_VA_BITS_36
+ bool "36-bit" if EXPERT
+ depends on ARM64_16K_PAGES
+
config ARM64_VA_BITS_39
bool "39-bit"
depends on ARM64_4K_PAGES
@@ -416,6 +431,10 @@ config ARM64_VA_BITS_42
bool "42-bit"
depends on ARM64_64K_PAGES
+config ARM64_VA_BITS_47
+ bool "47-bit"
+ depends on ARM64_16K_PAGES
+
config ARM64_VA_BITS_48
bool "48-bit"
@@ -423,8 +442,10 @@ endchoice
config ARM64_VA_BITS
int
+ default 36 if ARM64_VA_BITS_36
default 39 if ARM64_VA_BITS_39
default 42 if ARM64_VA_BITS_42
+ default 47 if ARM64_VA_BITS_47
default 48 if ARM64_VA_BITS_48
config CPU_BIG_ENDIAN
@@ -454,15 +475,13 @@ config NR_CPUS
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
+ select GENERIC_IRQ_MIGRATION
help
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu.
source kernel/Kconfig.preempt
-
-config HZ
- int
- default 100
+source kernel/Kconfig.hz
config ARCH_HAS_HOLES_MEMORYMODEL
def_bool y if SPARSEMEM
@@ -481,12 +500,8 @@ config HAVE_ARCH_PFN_VALID
def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
config HW_PERF_EVENTS
- bool "Enable hardware performance counter support for perf events"
- depends on PERF_EVENTS
- default y
- help
- Enable hardware performance counter support for perf events. If
- disabled, perf events will use software events only.
+ def_bool y
+ depends on ARM_PMU
config SYS_SUPPORTS_HUGETLBFS
def_bool y
@@ -495,7 +510,7 @@ config ARCH_WANT_GENERAL_HUGETLB
def_bool y
config ARCH_WANT_HUGE_PMD_SHARE
- def_bool y if !ARM64_64K_PAGES
+ def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
def_bool y
@@ -532,7 +547,25 @@ config XEN
config FORCE_MAX_ZONEORDER
int
default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
+ default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE)
default "11"
+ help
+ The kernel memory allocator divides physically contiguous memory
+ blocks into "zones", where each zone is a power of two number of
+ pages. This option selects the largest power of two that the kernel
+ keeps in the memory allocator. If you need to allocate very large
+ blocks of physically contiguous memory, then you may need to
+ increase this value.
+
+ This config option is actually maximum order plus one. For example,
+ a value of 11 means that the largest free memory block is 2^10 pages.
+
+ We make sure that we can allocate upto a HugePage size for each configuration.
+ Hence we have :
+ MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2
+
+ However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
+ 4M allocations matching the default size used by generic code.
menuconfig ARMV8_DEPRECATED
bool "Emulate deprecated/obsolete ARMv8 instructions"
@@ -707,7 +740,7 @@ source "fs/Kconfig.binfmt"
config COMPAT
bool "Kernel support for 32-bit EL0"
- depends on !ARM64_64K_PAGES || EXPERT
+ depends on ARM64_4K_PAGES || EXPERT
select COMPAT_BINFMT_ELF
select HAVE_UID16
select OLD_SIGSUSPEND3
@@ -718,9 +751,9 @@ config COMPAT
the user helper functions, VFP support and the ptrace interface are
handled appropriately by the kernel.
- If you also enabled CONFIG_ARM64_64K_PAGES, please be aware that you
- will only be able to execute AArch32 binaries that were compiled with
- 64k aligned segments.
+ If you use a page size other than 4KB (i.e, 16KB or 64KB), please be aware
+ that you will only be able to execute AArch32 binaries that were compiled
+ with page size aligned segments.
If you want to execute 32-bit userspace applications, say Y.