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authorArnd Bergmann <arnd@arndb.de>2011-06-10 14:12:21 +0000
committerArnd Bergmann <arnd@arndb.de>2011-10-01 21:08:43 +0200
commit89bace652cbfb78a2fd830025f8ea048d6eb3657 (patch)
tree6bd41b49614a50bd7f4bd8743da9006b926dce04 /lib
parent9934ebb8ffb1554ad76764b6e71767378d051329 (diff)
downloadlinux-89bace652cbfb78a2fd830025f8ea048d6eb3657.tar.gz
ARM: always use ARM_UNWIND for thumb2 kernels
Thumb2 kernels cannot be built with frame pointers, but can use the ARM_UNWIND feature for unwinding instead. This makes sure that all features that rely on unwinding includeing CONFIG_LATENCYTOP and FAULT_INJECTION_STACKTRACE_FILTER do not enable frame pointers when the unwinder is already selected, and we always build with the unwinder when we want a thumb2 kernel, to make sure we do not get the frame pointers instead. A different option would be to redefine the CONFIG_FRAME_POINTERS option on ARM to mean builing with either frame pointers or the unwinder, and then select which one to use based on the CPU architecture or another user option. That would still allow building thumb2 kernels without the unwinder but would also be more confusing. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c0cb9c4bc46..103c171ce60 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1081,7 +1081,7 @@ config FAULT_INJECTION_STACKTRACE_FILTER
depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
depends on !X86_64
select STACKTRACE
- select FRAME_POINTER if !PPC && !S390 && !MICROBLAZE
+ select FRAME_POINTER if !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND
help
Provide stacktrace filter for fault-injection capabilities
@@ -1091,7 +1091,7 @@ config LATENCYTOP
depends on DEBUG_KERNEL
depends on STACKTRACE_SUPPORT
depends on PROC_FS
- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE
+ select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND
select KALLSYMS
select KALLSYMS_ALL
select STACKTRACE