Hi Justin,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 169387e2aa291a4e3cb856053730fe99d6cec06f
commit: e56e18985596617ae426ed5997fb2e737cffb58b lib/crypto: add prompts back to crypto libraries
date: 11 days ago
config: arm-randconfig-r004-20220128 (https://download.01.org/0day-ci/archive/20220129/[email protected]/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4)
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
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e56e18985596617ae426ed5997fb2e737cffb58b
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e56e18985596617ae426ed5997fb2e737cffb58b
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings]
#warning This code requires at least version 4.6 of GCC
^
1 warning generated.
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for TEGRA20_APB_DMA
Depends on DMADEVICES && (ARCH_TEGRA || COMPILE_TEST
Selected by
- SOC_TEGRA_FUSE && ARCH_TEGRA && ARCH_TEGRA_2x_SOC
vim +30 arch/arm/lib/xor-neon.c
01956597cbc46d Ard Biesheuvel 2013-05-17 16
01956597cbc46d Ard Biesheuvel 2013-05-17 17 /*
01956597cbc46d Ard Biesheuvel 2013-05-17 18 * Pull in the reference implementations while instructing GCC (through
01956597cbc46d Ard Biesheuvel 2013-05-17 19 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit
01956597cbc46d Ard Biesheuvel 2013-05-17 20 * NEON instructions.
01956597cbc46d Ard Biesheuvel 2013-05-17 21 */
01956597cbc46d Ard Biesheuvel 2013-05-17 22 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
01956597cbc46d Ard Biesheuvel 2013-05-17 23 #pragma GCC optimize "tree-vectorize"
01956597cbc46d Ard Biesheuvel 2013-05-17 24 #else
01956597cbc46d Ard Biesheuvel 2013-05-17 25 /*
01956597cbc46d Ard Biesheuvel 2013-05-17 26 * While older versions of GCC do not generate incorrect code, they fail to
01956597cbc46d Ard Biesheuvel 2013-05-17 27 * recognize the parallel nature of these functions, and emit plain ARM code,
01956597cbc46d Ard Biesheuvel 2013-05-17 28 * which is known to be slower than the optimized ARM code in asm-arm/xor.h.
01956597cbc46d Ard Biesheuvel 2013-05-17 29 */
01956597cbc46d Ard Biesheuvel 2013-05-17 @30 #warning This code requires at least version 4.6 of GCC
01956597cbc46d Ard Biesheuvel 2013-05-17 31 #endif
01956597cbc46d Ard Biesheuvel 2013-05-17 32
:::::: The code at line 30 was first introduced by commit
:::::: 01956597cbc46df072f20f90a40eebe356200c38 ARM: crypto: add NEON accelerated XOR implementation
:::::: TO: Ard Biesheuvel <[email protected]>
:::::: CC: Ard Biesheuvel <[email protected]>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On Sat, Jan 29, 2022 at 03:02:58PM +0800, kernel test robot wrote:
> Hi Justin,
>
> First bad commit (maybe != root cause):
Yeah, this commit definitely does not introduce this warning, it has
been one of our longest tracked warnings.
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 169387e2aa291a4e3cb856053730fe99d6cec06f
> commit: e56e18985596617ae426ed5997fb2e737cffb58b lib/crypto: add prompts back to crypto libraries
> date: 11 days ago
> config: arm-randconfig-r004-20220128 (https://download.01.org/0day-ci/archive/20220129/[email protected]/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4)
> 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
> # install arm cross compiling tool for clang build
> # apt-get install binutils-arm-linux-gnueabi
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e56e18985596617ae426ed5997fb2e737cffb58b
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout e56e18985596617ae426ed5997fb2e737cffb58b
> # save the config file to linux build tree
> mkdir build_dir
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <[email protected]>
>
> All warnings (new ones prefixed by >>):
>
> >> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings]
> #warning This code requires at least version 4.6 of GCC
> ^
> 1 warning generated.
https://github.com/ClangBuiltLinux/linux/issues/496
https://lore.kernel.org/r/[email protected]/
Cheers,
Nathan