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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2011-05-23 10:24:31 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-05-23 10:24:29 +0200
commitadd7490c273650c3aa8012f3e082aa64af86f17c (patch)
tree80dbc7913434d8b56235f1f0fc4e172152fa13b0 /arch/s390/kernel
parentcf2d007bd43bc254d5254fe9d30af3e73ed5b98a (diff)
[S390] vdso: disable gcov profiling
The concepts of VDSO and gcov-based profiling don't mix: the former includes kernel-provided code running in userspace, the latter adds instructions that modify counters in kernel data segments. On s390 this has not been a problem so far due to VDSO code being written in all-assembler which is exempt from gcov-based profiling. This could change in the future, so disable profiling excplicitly for VDSO code. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/vdso32/Makefile3
-rw-r--r--arch/s390/kernel/vdso64/Makefile3
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile
index d13e8755a8c..8ad2b34ad15 100644
--- a/arch/s390/kernel/vdso32/Makefile
+++ b/arch/s390/kernel/vdso32/Makefile
@@ -22,6 +22,9 @@ obj-y += vdso32_wrapper.o
extra-y += vdso32.lds
CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
+# Disable gcov profiling for VDSO code
+GCOV_PROFILE := n
+
# Force dependency (incbin is bad)
$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile
index 449352dda9c..2a8ddfd12a5 100644
--- a/arch/s390/kernel/vdso64/Makefile
+++ b/arch/s390/kernel/vdso64/Makefile
@@ -22,6 +22,9 @@ obj-y += vdso64_wrapper.o
extra-y += vdso64.lds
CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
+# Disable gcov profiling for VDSO code
+GCOV_PROFILE := n
+
# Force dependency (incbin is bad)
$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so