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[added,to,the,4.1,stable,tree] gcov: disable for COMPILE_TEST

Message ID 20180301152116.1486-173-alexander.levin@microsoft.com
State New
Headers show
Series [added,to,the,4.1,stable,tree] gcov: disable for COMPILE_TEST | expand

Commit Message

Sasha Levin March 1, 2018, 3:24 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>


This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

-- 
2.14.1
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Patch

===============

[ Upstream commit cc622420798c4bcf093785d872525087a7798db9 ]

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>
Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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