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| author | Arnd Bergmann <arnd@arndb.de> | 2023-02-15 10:14:48 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-02-22 10:28:20 -0800 |
| commit | 6ba912f1c081448cf3d1fa9ada9115aae4594ac4 (patch) | |
| tree | cdf5111075c8761902e8f2d5a7e342558b693982 /lib | |
| parent | 1b929c02afd37871d5afb9d498426f83432e71c2 (diff) | |
| download | lwn-6ba912f1c081448cf3d1fa9ada9115aae4594ac4.tar.gz lwn-6ba912f1c081448cf3d1fa9ada9115aae4594ac4.zip | |
kcsan: select CONFIG_CONSTRUCTORS
Building a kcsan enabled kernel for x86_64 with gcc-11 results in a lot
of build warnings or errors without CONFIG_CONSTRUCTORS:
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/copy_mc.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/cpu.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/csum-partial_64.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/csum-wrappers_64.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/insn-eval.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/insn.o'
x86_64-linux-ld: error: unplaced orphan section `.ctors.65436' from `arch/x86/lib/misc.o'
The same thing has been reported for mips64. I can't reproduce it for
any other compiler version, so I don't know if constructors are always
required here or if this is a gcc-11 specific implementation detail.
I see no harm in always enabling constructors here, and this reliably
fixes the build warnings for me.
Link: https://lore.kernel.org/lkml/202204181801.r3MMkwJv-lkp@intel.com/T/
Cc: Kees Cook <keescook@chromium.org>
See-also: 3e6631485fae ("vmlinux.lds.h: Keep .ctors.* with .ctors")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.kcsan | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan index 375575a5a0e3..cb926b393556 100644 --- a/lib/Kconfig.kcsan +++ b/lib/Kconfig.kcsan @@ -14,6 +14,7 @@ menuconfig KCSAN bool "KCSAN: dynamic data race detector" depends on HAVE_ARCH_KCSAN && HAVE_KCSAN_COMPILER depends on DEBUG_KERNEL && !KASAN + select CONSTRUCTORS select STACKTRACE help The Kernel Concurrency Sanitizer (KCSAN) is a dynamic |