87bf8f8733
[ Upstream commit 40249c6962075c040fd071339acae524f18bfac9 ] Using gcov to collect coverage data for kernels compiled with GCC 10.1 causes random malfunctions and kernel crashes. This is the result of a changed GCOV_COUNTERS value in GCC 10.1 that causes a mismatch between the layout of the gcov_info structure created by GCC profiling code and the related structure used by the kernel. Fix this by updating the in-kernel GCOV_COUNTERS value. Also re-enable config GCOV_KERNEL for use with GCC 10. Reported-by: Colin Ian King <colin.king@canonical.com> Reported-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com> Tested-by: Leon Romanovsky <leonro@nvidia.com> Tested-and-Acked-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
78 lines
2.0 KiB
Plaintext
78 lines
2.0 KiB
Plaintext
menu "GCOV-based kernel profiling"
|
|
|
|
config GCOV_KERNEL
|
|
bool "Enable gcov-based kernel profiling"
|
|
depends on DEBUG_FS
|
|
select CONSTRUCTORS if !UML
|
|
default n
|
|
---help---
|
|
This option enables gcov-based code profiling (e.g. for code coverage
|
|
measurements).
|
|
|
|
If unsure, say N.
|
|
|
|
Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
|
|
for the entire kernel. To enable profiling for specific files or
|
|
directories, add a line similar to the following to the respective
|
|
Makefile:
|
|
|
|
For a single file (e.g. main.o):
|
|
GCOV_PROFILE_main.o := y
|
|
|
|
For all files in one directory:
|
|
GCOV_PROFILE := y
|
|
|
|
To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
|
|
is specified, use:
|
|
|
|
GCOV_PROFILE_main.o := n
|
|
and:
|
|
GCOV_PROFILE := n
|
|
|
|
Note that the debugfs filesystem has to be mounted to access
|
|
profiling data.
|
|
|
|
config ARCH_HAS_GCOV_PROFILE_ALL
|
|
def_bool n
|
|
|
|
config GCOV_PROFILE_ALL
|
|
bool "Profile entire Kernel"
|
|
depends on !COMPILE_TEST
|
|
depends on GCOV_KERNEL
|
|
depends on ARCH_HAS_GCOV_PROFILE_ALL
|
|
default n
|
|
---help---
|
|
This options activates profiling for the entire kernel.
|
|
|
|
If unsure, say N.
|
|
|
|
Note that a kernel compiled with profiling flags will be significantly
|
|
larger and run slower. Also be sure to exclude files from profiling
|
|
which are not linked to the kernel image to prevent linker errors.
|
|
|
|
choice
|
|
prompt "Specify GCOV format"
|
|
depends on GCOV_KERNEL
|
|
depends on CC_IS_GCC
|
|
---help---
|
|
The gcov format is usually determined by the GCC version, and the
|
|
default is chosen according to your GCC version. However, there are
|
|
exceptions where format changes are integrated in lower-version GCCs.
|
|
In such a case, change this option to adjust the format used in the
|
|
kernel accordingly.
|
|
|
|
config GCOV_FORMAT_3_4
|
|
bool "GCC 3.4 format"
|
|
depends on GCC_VERSION < 40700
|
|
---help---
|
|
Select this option to use the format defined by GCC 3.4.
|
|
|
|
config GCOV_FORMAT_4_7
|
|
bool "GCC 4.7 format"
|
|
---help---
|
|
Select this option to use the format defined by GCC 4.7.
|
|
|
|
endchoice
|
|
|
|
endmenu
|