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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-08 12:17:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-08 12:17:25 -0700
commit09b56d5a418b7ced4ca427c7cf8faf11df72364c (patch)
tree88ad1fe20f8fd7df89131cef5c7f8ef96f15406d /arch/arm/mm
parentfe1b518075d86976db3a93e7e8b640d24d477519 (diff)
parent98becb781e3e27d74efe5f3653b948d39f694cfb (diff)
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Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
Pull ARM updates from Russell King: - add support for ftrace-with-registers, which is needed for kgraft and other ftrace tools - support for mremap() for the sigpage/vDSO so that checkpoint/restore can work - add timestamps to each line of the register dump output - remove the unused KTHREAD_SIZE from nommu - align the ARM bitops APIs with the generic API (using unsigned long pointers rather than void pointers) - make the configuration of userspace Thumb support an expert option so that we can default it on, and avoid some hard to debug userspace crashes * 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: ARM: 8684/1: NOMMU: Remove unused KTHREAD_SIZE definition ARM: 8683/1: ARM32: Support mremap() for sigpage/vDSO ARM: 8679/1: bitops: Align prototypes to generic API ARM: 8678/1: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS ARM: make configuration of userspace Thumb support an expert option ARM: 8673/1: Fix __show_regs output timestamps
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/Kconfig6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 877a0e3fd17d..60cdfdc151aa 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -679,7 +679,7 @@ config ARCH_DMA_ADDR_T_64BIT
bool
config ARM_THUMB
- bool "Support Thumb user binaries" if !CPU_THUMBONLY
+ bool "Support Thumb user binaries" if !CPU_THUMBONLY && EXPERT
depends on CPU_THUMB_CAPABLE
default y
help
@@ -690,6 +690,10 @@ config ARM_THUMB
instruction set resulting in smaller binaries at the expense of
slightly less efficient code.
+ If this option is disabled, and you run userspace that switches to
+ Thumb mode, signal handling will not work correctly, resulting in
+ segmentation faults or illegal instruction aborts.
+
If you don't know what this all is, saying Y is a safe choice.
config ARM_THUMBEE