Messages in this thread | | | Subject | Re: [PATCH 3/5] gcov: disable for COMPILE_TEST | From | Peter Oberparleiter <> | Date | Mon, 15 Feb 2016 15:23:19 +0100 |
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On 12.02.2016 17:06, Arnd Bergmann wrote: > Enabling gcov is counterproductive to compile testing: it significantly > increases the kernel image size, compile time, and it produces lots > of false positive "may be used uninitialized" warnings as the result > of missed optimizations. > > This is in line with how UBSAN_SANITIZE_ALL and PROFILE_ALL_BRANCHES > work, both of which have similar problems. > > With an ARM allmodconfig kernel, I see the build time drop from > 283 minutes CPU time to 225 minutes, and the vmlinux size drops > from 43MB to 26MB. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Agreed that COMPILE_TEST + GCOV_PROFILE_ALL is a very exotic combination with little added use.
Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
> --- > kernel/gcov/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig > index c92e44855ddd..1276aabaab55 100644 > --- a/kernel/gcov/Kconfig > +++ b/kernel/gcov/Kconfig > @@ -37,6 +37,7 @@ config ARCH_HAS_GCOV_PROFILE_ALL > > 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 >
-- Peter Oberparleiter Linux on z Systems Development - IBM Germany
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