[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200921162038.301152872@linuxfoundation.org>
Date: Mon, 21 Sep 2020 18:27:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
Leon Romanovsky <leonro@...dia.com>,
Peter Oberparleiter <oberpar@...ux.ibm.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 60/94] gcov: add support for GCC 10.1
From: Peter Oberparleiter <oberpar@...ux.ibm.com>
[ Upstream commit 40249c6962075c040fd071339acae524f18bfac9 ]
Using gcov to collect coverage data for kernels compiled with GCC 10.1
causes random malfunctions and kernel crashes. This is the result of a
changed GCOV_COUNTERS value in GCC 10.1 that causes a mismatch between
the layout of the gcov_info structure created by GCC profiling code and
the related structure used by the kernel.
Fix this by updating the in-kernel GCOV_COUNTERS value. Also re-enable
config GCOV_KERNEL for use with GCC 10.
Reported-by: Colin Ian King <colin.king@...onical.com>
Reported-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
Tested-by: Leon Romanovsky <leonro@...dia.com>
Tested-and-Acked-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
kernel/gcov/Kconfig | 1 -
kernel/gcov/gcc_4_7.c | 4 +++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 1d78ed19a3512..1276aabaab550 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -3,7 +3,6 @@ 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---
diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
index ca5e5c0ef8536..5b9e76117ded1 100644
--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -19,7 +19,9 @@
#include <linux/vmalloc.h>
#include "gcov.h"
-#if (__GNUC__ >= 7)
+#if (__GNUC__ >= 10)
+#define GCOV_COUNTERS 8
+#elif (__GNUC__ >= 7)
#define GCOV_COUNTERS 9
#elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)
#define GCOV_COUNTERS 10
--
2.25.1
Powered by blists - more mailing lists