[PATCH -rc v1] gcov: Disable gcov build with GCC 10

[Leon Romanovsky]

From: Leon Romanovsky <leonro@xxxxxxxxxx>

GCOV built with GCC 10 doesn't initialize n_function variable.
This produces different kernel panics as was seen by Colin in
Ubuntu [1] and me in FC 32 [2].

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

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288
[2] https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@xxxxxxxxxx
Cc: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
 As was discussed:
 https://lore.kernel.org/lkml/CAHk-=whbijeSdSvx-Xcr0DPMj0BiwhJ+uiNnDSVZcr_h_kg7UA@xxxxxxxxxxxxxx/
---
 kernel/gcov/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 3110c77230c7..bb4b680e8455 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -4,6 +4,7 @@ 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
--
2.26.2