Commit cc622420 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Michal Marek

gcov: disable for COMPILE_TEST

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: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
parent 815eb71e
...@@ -37,6 +37,7 @@ config ARCH_HAS_GCOV_PROFILE_ALL ...@@ -37,6 +37,7 @@ config ARCH_HAS_GCOV_PROFILE_ALL
config GCOV_PROFILE_ALL config GCOV_PROFILE_ALL
bool "Profile entire Kernel" bool "Profile entire Kernel"
depends on !COMPILE_TEST
depends on GCOV_KERNEL depends on GCOV_KERNEL
depends on ARCH_HAS_GCOV_PROFILE_ALL depends on ARCH_HAS_GCOV_PROFILE_ALL
default n default n
......
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