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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2011-05-23 10:24:31 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-05-23 10:24:29 +0200 |
| commit | add7490c273650c3aa8012f3e082aa64af86f17c (patch) | |
| tree | 80dbc7913434d8b56235f1f0fc4e172152fa13b0 | |
| parent | cf2d007bd43bc254d5254fe9d30af3e73ed5b98a (diff) | |
| download | linux-add7490c273650c3aa8012f3e082aa64af86f17c.tar.bz2 | |
[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>
| -rw-r--r-- | arch/s390/kernel/vdso32/Makefile | 3 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/Makefile | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso32/Makefile b/arch/s390/kernel/vdso32/Makefile index d13e8755a8cc..8ad2b34ad151 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 : $(obj)/vdso32.so diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile index 449352dda9cd..2a8ddfd12a5b 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -22,6 +22,9 @@ obj-y += vdso64_wrapper.o extra-y += vdso64.lds CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) +# Disable gcov profiling for VDSO code +GCOV_PROFILE := n + # Force dependency (incbin is bad) $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so |