On 23.08.2013 17:15, Peter Oberparleiter wrote: > On 23.08.2013 10:39, Frantisek Hrbata wrote: >> Compile the correct gcov implementation file for a specific gcc version. In >> the future, if another file is added, the conditions will need to be somehow >> adjusted to if-elif-else case, but at this point the simple cc-ifversion should >> be enough. As promised, I'm also adding the patch that makes the format-specific part of gcov-kernel a loadable kernel module: --- kernel: gcov: make format-specific code loadable Turn the format-specific part of gcov-kernel into a loadable kernel module. This enables the use of gcov-kernel with kernel modules that were compiled with a version of GCC that produces a different gcov format when compared to the version of GCC that was used to compile the kernel. Signed-off-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxxxxxxx> --- kernel/gcov/Kconfig | 19 +++++++++++++++++-- kernel/gcov/Makefile | 7 ++++--- 2 files changed, 21 insertions(+), 5 deletions(-) --- a/kernel/gcov/Kconfig +++ b/kernel/gcov/Kconfig @@ -29,8 +29,23 @@ config GCOV_KERNEL and: GCOV_PROFILE := n - Note that the debugfs filesystem has to be mounted to access - profiling data. + Note that GCOV_KERNEL_FS has to specified as well and the debugfs + filesystem has to be mounted to access profiling data. + +config GCOV_KERNEL_FS + tristate "Provide gcov data files in debugfs" + depends on GCOV_KERNEL + default y + ---help--- + Make profiling data available in debugfs at /sys/kernel/debug/gcov. + + Say M if you want to enable collecting coverage data for kernel modules + which are compiled using a gcc version different from the one that + was used to compile the kernel. In that case, re-compile the gcov + kernel module with corresponding format support and load that module + instead. + + If unsure, say Y. config GCOV_PROFILE_ALL bool "Profile entire Kernel" --- a/kernel/gcov/Makefile +++ b/kernel/gcov/Makefile @@ -13,10 +13,11 @@ else cc-ver := $(call cc-version) endif -obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o +obj-$(CONFIG_GCOV_KERNEL) += base.o +obj-$(CONFIG_GCOV_KERNEL_FS) += gcov.o ifeq ($(call if-lt, $(cc-ver), 0407),1) - obj-$(CONFIG_GCOV_KERNEL) += gcc_3_4.o + gcov-objs += fs.o gcc_3_4.o else - obj-$(CONFIG_GCOV_KERNEL) += gcc_4_7.o + gcov-objs += fs.o gcc_4_7.o endif -- Peter Oberparleiter Linux on System z Development - IBM Germany -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
