diff options
| author | Stefan Agner <stefan@agner.ch> | 2018-10-01 00:02:33 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-10-04 15:48:58 +0200 |
| commit | f9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac (patch) | |
| tree | eb472871b0363395c125455e289e5c67e830f9e5 /lib/Kconfig.debug | |
| parent | ARM: 8798/1: remove unnecessary KBUILD_SRC ifeq conditional (diff) | |
| download | linux-f9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac.tar.xz linux-f9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac.zip | |
ARM: 8800/1: use choice for kernel unwinders
While in theory multiple unwinders could be compiled in, it does
not make sense in practise. Use a choice to make the unwinder
selection mutually exclusive and mandatory.
Already before this commit it has not been possible to deselect
FRAME_POINTER. Remove the obsolete comment.
Furthermore, to produce a meaningful backtrace with FRAME_POINTER
enabled the kernel needs a specific function prologue:
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
To get to the required prologue gcc uses apcs and no-sched-prolog.
This compiler options are not available on clang, and clang is not
able to generate the required prologue. Make the FRAME_POINTER
config symbol depending on !clang.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 613316724c6a..25188b322326 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1179,7 +1179,7 @@ config LOCKDEP bool depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT select STACKTRACE - select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC && !X86 + select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !X86 select KALLSYMS select KALLSYMS_ALL @@ -1590,7 +1590,7 @@ config FAULT_INJECTION_STACKTRACE_FILTER depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT depends on !X86_64 select STACKTRACE - select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86 + select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 help Provide stacktrace filter for fault-injection capabilities @@ -1599,7 +1599,7 @@ config LATENCYTOP depends on DEBUG_KERNEL depends on STACKTRACE_SUPPORT depends on PROC_FS - select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86 + select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86 select KALLSYMS select KALLSYMS_ALL select STACKTRACE |