The patch titled
gcov: fix run-time error on x86_64
has been added to the -mm tree. Its filename is
gcov-architecture-specific-compile-flag-adjustments-x86_64-fix.patch
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------------------------------------------------------
Subject: gcov: fix run-time error on x86_64
From: Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx>
Disable profiling of tsc_$(BITS).o to fix a run-time error when using
CONFIG_GCOV_PROFILE_ALL on x86_64:
bash[498] segfault at ffffffff80868b58 ip ffffffffff600412
sp 7fffa3d010f0 error 7
init[1] segfault at ffffffff80868b58 ip ffffffffff600412
sp 7fff9e97f640 error 7
init[1] segfault at ffffffff80868b58 ip ffffffffff600412
sp 7fff9e97eed0 error 7
Kernel panic - not syncing: Attemted to kill init!
Pid 1, comm: init Not tainted 2.6.26-rc5-mm1 #1
m.kozlowski@xxxxxxxxxx wrote:
> After a few hours and tons of reboots I narrowed it down to
> arch/x86/kernel/Makefile:
>
> a) works
> obj-y += tsc_$(BITS).o io_delay.o rtc.o
> GCOV_tsc_$(BITS).o := n
> #GCOV_io_delay.o := n
> #GCOV_rtc.o := n
>
> b) doesn't work
> obj-y += tsc_$(BITS).o io_delay.o rtc.o
> #GCOV_tsc_$(BITS).o := n
> #GCOV_io_delay.o := n
> #GCOV_rtc.o := n
>
> and that points to arch/x86/kernel/tsc_64.c
Reported-by: Mariusz Kozlowski <m.kozlowski@xxxxxxxxxx>
Reviewed-by: Mariusz Kozlowski <m.kozlowski@xxxxxxxxxx>
Reviewed-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff -puN arch/x86/kernel/Makefile~gcov-architecture-specific-compile-flag-adjustments-x86_64-fix arch/x86/kernel/Makefile
--- a/arch/x86/kernel/Makefile~gcov-architecture-specific-compile-flag-adjustments-x86_64-fix
+++ a/arch/x86/kernel/Makefile
@@ -13,6 +13,9 @@ CFLAGS_REMOVE_tsc_32.o = -pg
CFLAGS_REMOVE_rtc.o = -pg
endif
+GCOV_tsc_32.o := n
+GCOV_tsc_64.o := n
+
#
# vsyscalls (which work on the user stack) should have
# no stack-protector checks:
_
Patches currently in -mm which might be from peter.oberparleiter@xxxxxxxxxx are
s390-cio-use-memory_read_from_buffer.patch
kernel-call-constructors.patch
kernel-call-constructors-uml-fix-1.patch
kernel-call-constructors-uml-fix-2.patch
kernel-introduce-gcc_version_lower-macro.patch
seq_file-add-function-to-write-binary-data.patch
gcov-add-gcov-profiling-infrastructure.patch
gcov-add-gcov-profiling-infrastructure-revert-link-changes.patch
gcov-create-links-to-gcda-files-in-build-directory.patch
gcov-architecture-specific-compile-flag-adjustments.patch
gcov-architecture-specific-compile-flag-adjustments-powerpc-moved-stuff.patch
gcov-architecture-specific-compile-flag-adjustments-powerpc-fix.patch
gcov-architecture-specific-compile-flag-adjustments-x86_64-fix.patch
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