[S390] omit frame pointers on s390 when possible

Always omit frame pointers on s390. They aren't too useful for the
kernel since we have already the kernel stack backchain which allows
us to walk the kernel stack.
So eleminate the extra code for frame pointers. Only allow the extra
code for the function tracer since the gcc compile options -pg and
-fomit-frame-pointer are incompatible.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c6e854f..812c282 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -440,7 +440,7 @@ config LOCKDEP
        bool
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select STACKTRACE
-       select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND
+       select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND && !S390
        select KALLSYMS
        select KALLSYMS_ALL
 
@@ -620,7 +620,7 @@ config ARCH_WANT_FRAME_POINTERS
 config FRAME_POINTER
        bool "Compile the kernel with frame pointers"
        depends on DEBUG_KERNEL && \
-               (CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
+               (CRIS || M68K || M68KNOMMU || FRV || UML || \
                 AVR32 || SUPERH || BLACKFIN || MN10300) || \
                ARCH_WANT_FRAME_POINTERS
        default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
@@ -809,13 +809,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER
        depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
        depends on !X86_64
        select STACKTRACE
-       select FRAME_POINTER if !PPC
+       select FRAME_POINTER if !PPC && !S390
        help
          Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
        bool "Latency measuring infrastructure"
-       select FRAME_POINTER if !MIPS && !PPC
+       select FRAME_POINTER if !MIPS && !PPC && !S390
        select KALLSYMS
        select KALLSYMS_ALL
        select STACKTRACE