When building mips tinyconifg the following warning show up
make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3: ^ /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit .section .mips_abiflags, "a" ^
Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless LLVM_IAS is defined.
Link: https://github.com/ClangBuiltLinux/linux/issues/1256 Cc: stable@vger.kernel.org # v4.19+ Suggested-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Anders Roxell anders.roxell@linaro.org --- arch/mips/vdso/Makefile | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile index 5810cc12bc1d..83e8cf216ac8 100644 --- a/arch/mips/vdso/Makefile +++ b/arch/mips/vdso/Makefile @@ -26,6 +26,10 @@ ifdef CONFIG_CC_IS_CLANG ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS)) endif
+ifneq ($(LLVM_IAS),1) +ccflags-vdso += -no-integrated-as +endif + # # The -fno-jump-tables flag only prevents the compiler from generating # jump tables but does not prevent the compiler from emitting absolute
On Fri, Jan 15, 2021 at 08:13:30PM +0100, Anders Roxell wrote:
I believe this is the better solution:
https://lore.kernel.org/r/20210115192622.3828545-1-natechancellor@gmail.com/
Cheers, Nathan
On Fri, 15 Jan 2021 at 20:28, Nathan Chancellor natechancellor@gmail.com wrote:
Yes, I agree.
Cheers, Anders
On 2021-01-15, Anders Roxell wrote:
http://lore.kernel.org/r/20201202010850.jibrjpyu6xgkff5p@google.com Personally I'd drop DWARF v2 as an option.
On Fri, Jan 15, 2021 at 12:13 PM Fangrui Song maskray@google.com wrote:
http://lore.kernel.org/r/20201202010850.jibrjpyu6xgkff5p@google.com Personally I'd drop DWARF v2 as an option.
WIP :P
Hi Anders,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master] [also build test ERROR on v5.11-rc3 next-20210115] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Anders-Roxell/mips-vdso-fix-DWARF2-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5ee88057889bbca5f5bb96031b62b3756b33e164 config: mips-cavium_octeon_defconfig (attached as .config) compiler: mips64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/242da1138d05b84d92be2e0a06d6e3fb40c7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903 git checkout 242da1138d05b84d92be2e0a06d6e3fb40c752de # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com
All errors (new ones prefixed by >>):
mips64-linux-gcc: error: unrecognized command line option '-no-integrated-as'; did you mean '-no-integrated-cpp'?
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Hi Anders,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master] [also build test ERROR on v5.11-rc3 next-20210115] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Anders-Roxell/mips-vdso-fix-DWARF2-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5ee88057889bbca5f5bb96031b62b3756b33e164 config: mips-randconfig-p001-20210115 (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/242da1138d05b84d92be2e0a06d6e3fb40c7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Anders-Roxell/mips-vdso-fix-DWARF2-warning/20210116-031903 git checkout 242da1138d05b84d92be2e0a06d6e3fb40c752de # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com
All errors (new ones prefixed by >>):
mips-linux-gcc: error: unrecognized command line option '-no-integrated-as'; did you mean '-no-integrated-cpp'?
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
linux-stable-mirror@lists.linaro.org
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Anders Roxell -
Fangrui Song -
kernel test robot -
Nathan Chancellor -
Nick Desaulniers