[PATCH 4.19 39/78] gcov: Disable gcov build with GCC 10

Greg Kroah-Hartman
2020-09-15T23:39:38Z

From: Leon Romanovsky <leonro@nvidia.com>

[ Upstream commit cfc905f158eaa099d6258031614d11869e7ef71c ]

GCOV built with GCC 10 doesn't initialize n_function variable. This
produces different kernel panics as was seen by Colin in Ubuntu and me
in FC 32.

As a workaround, let's disable GCOV build for broken GCC 10 version.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288
Link: https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org
Link: https://lore.kernel.org/lkml/CAHk-=whbijeSdSvx-Xcr0DPMj0BiwhJ+uiNnDSVZcr_h_kg7UA@mail.gmail.com/
Cc: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/gcov/Kconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 1e3823fa799b2..bfb6579a19d07 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -3,6 +3,7 @@ menu "GCOV-based kernel profiling"
config GCOV_KERNEL
bool "Enable gcov-based kernel profiling"
depends on DEBUG_FS
+ depends on !CC_IS_GCC || GCC_VERSION < 100000
select CONSTRUCTORS if !UML
default n
---help---
--
2.25.1