diff options
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 7eb94e6fc376..f222ea1a8779 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -624,6 +624,10 @@ config ARM_LPAE If unsure, say N. +config ARM_PV_FIXUP + def_bool y + depends on ARM_LPAE && ARM_PATCH_PHYS_VIRT && ARCH_KEYSTONE + config ARCH_PHYS_ADDR_T_64BIT def_bool ARM_LPAE @@ -825,6 +829,20 @@ config KUSER_HELPERS Say N here only if you are absolutely certain that you do not need these helpers; otherwise, the safe option is to say Y. +config VDSO + bool "Enable VDSO for acceleration of some system calls" + depends on AEABI && MMU && CPU_V7 + default y if ARM_ARCH_TIMER + select GENERIC_TIME_VSYSCALL + help + Place in the process address space an ELF shared object + providing fast implementations of gettimeofday and + clock_gettime. Systems that implement the ARM architected + timer will receive maximum benefit. + + You must have glibc 2.22 or later for programs to seamlessly + take advantage of this. + config DMA_CACHE_RWFO bool "Enable read/write for ownership DMA cache maintenance" depends on CPU_V6K && SMP @@ -1009,3 +1027,24 @@ config ARCH_SUPPORTS_BIG_ENDIAN help This option specifies the architecture can support big endian operation. + +config ARM_KERNMEM_PERMS + bool "Restrict kernel memory permissions" + help + If this is set, kernel memory other than kernel text (and rodata) + will be made non-executable. The tradeoff is that each region is + padded to section-size (1MiB) boundaries (because their permissions + are different and splitting the 1M pages into 4K ones causes TLB + performance problems), wasting memory. + +config DEBUG_RODATA + bool "Make kernel text and rodata read-only" + depends on ARM_KERNMEM_PERMS + default y + help + If this is set, kernel text and rodata will be made read-only. This + is to help catch accidental or malicious attempts to change the + kernel's executable code. Additionally splits rodata from kernel + text so it can be made explicitly non-executable. This creates + another section-size padded region, so it can waste more memory + space while gaining the read-only protections. |