[PATCH] lockdep: s390 CONFIG_FRAME_POINTER support

CONFIG_FRAME_POINTER support for s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index b3791fb094a82e88354d59b571dd9134ca1964a4..74ef57dcfa60b5bb9527d6651440995851aa9ebd 100644 (file)
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -34,6 +34,11 @@ cflags-$(CONFIG_MARCH_G5)   += $(call cc-option,-march=g5)
 cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
 cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
 
+#
+# Prevent tail-call optimizations, to get clearer backtraces:
+#
+cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
+
 # old style option for packed stacks
 ifeq ($(call cc-option-yn,-mkernel-backchain),y)
 cflags-$(CONFIG_PACK_STACK)  += -mkernel-backchain -D__PACK_STACK

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 04e374c6fd4664f4c029cbdc76c0c7355dfd2fa0..91e338a3d0693b19c46a2407fd29785ad2de54e4 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -208,7 +208,7 @@ config DEBUG_VM
 
 config FRAME_POINTER
        bool "Compile the kernel with frame pointers"
-       depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML)
+       depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390)
        default y if DEBUG_INFO && UML
        help
          If you say Y here the resulting kernel image will be slightly larger