957e3facd1
Following the suggestions from Andrew Morton and Stephen Rothwell, Dont expand the ARCH list in kernel/gcov/Kconfig. Instead, define a ARCH_HAS_GCOV_PROFILE_ALL bool which architectures can enable. set ARCH_HAS_GCOV_PROFILE_ALL on Architectures where it was previously allowed + ARM64 which I tested. Signed-off-by: Riku Voipio <riku.voipio@linaro.org> Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
82 lines
2.1 KiB
Text
82 lines
2.1 KiB
Text
menu "GCOV-based kernel profiling"
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config GCOV_KERNEL
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bool "Enable gcov-based kernel profiling"
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depends on DEBUG_FS
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select CONSTRUCTORS if !UML
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default n
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---help---
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This option enables gcov-based code profiling (e.g. for code coverage
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measurements).
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If unsure, say N.
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Additionally specify CONFIG_GCOV_PROFILE_ALL=y to get profiling data
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for the entire kernel. To enable profiling for specific files or
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directories, add a line similar to the following to the respective
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Makefile:
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For a single file (e.g. main.o):
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GCOV_PROFILE_main.o := y
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For all files in one directory:
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GCOV_PROFILE := y
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To exclude files from being profiled even when CONFIG_GCOV_PROFILE_ALL
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is specified, use:
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GCOV_PROFILE_main.o := n
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and:
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GCOV_PROFILE := n
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Note that the debugfs filesystem has to be mounted to access
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profiling data.
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config ARCH_HAS_GCOV_PROFILE_ALL
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def_bool n
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config GCOV_PROFILE_ALL
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bool "Profile entire Kernel"
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depends on GCOV_KERNEL
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depends on ARCH_HAS_GCOV_PROFILE_ALL
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default n
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---help---
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This options activates profiling for the entire kernel.
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If unsure, say N.
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Note that a kernel compiled with profiling flags will be significantly
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larger and run slower. Also be sure to exclude files from profiling
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which are not linked to the kernel image to prevent linker errors.
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choice
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prompt "Specify GCOV format"
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depends on GCOV_KERNEL
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default GCOV_FORMAT_AUTODETECT
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---help---
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The gcov format is usually determined by the GCC version, but there are
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exceptions where format changes are integrated in lower-version GCCs.
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In such a case use this option to adjust the format used in the kernel
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accordingly.
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If unsure, choose "Autodetect".
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config GCOV_FORMAT_AUTODETECT
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bool "Autodetect"
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---help---
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Select this option to use the format that corresponds to your GCC
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version.
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config GCOV_FORMAT_3_4
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bool "GCC 3.4 format"
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---help---
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Select this option to use the format defined by GCC 3.4.
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config GCOV_FORMAT_4_7
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bool "GCC 4.7 format"
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---help---
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Select this option to use the format defined by GCC 4.7.
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endchoice
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endmenu
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