Hi Topi, Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on aae5ab854e38151e69f261dbf0e3b7e396403178] url: https://github.com/0day-ci/linux/commits/Topi-Miettinen/mm-Optional-full-ASLR-for-mmap-mremap-vdso-and-stack/20201130-051703 base: aae5ab854e38151e69f261dbf0e3b7e396403178 config: x86_64-randconfig-a002-20201130 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project f502b14d40e751fe00afc493ef0d08f196524886) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/c06384c5cecf700db214c69a4565c41a4c4fad82 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Topi-Miettinen/mm-Optional-full-ASLR-for-mmap-mremap-vdso-and-stack/20201130-051703 git checkout c06384c5cecf700db214c69a4565c41a4c4fad82 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): arch/x86/entry/vdso/vma.c:38:19: warning: no previous prototype for function 'arch_get_vdso_data' [-Wmissing-prototypes] struct vdso_data *arch_get_vdso_data(void *vvar_page) ^ arch/x86/entry/vdso/vma.c:38:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct vdso_data *arch_get_vdso_data(void *vvar_page) ^ static >> arch/x86/entry/vdso/vma.c:382:9: warning: cast to 'void *' from smaller >> integer type 'int' [-Wint-to-void-pointer-cast] if (!IS_ERR_VALUE(ret)) ^~~~~~~~~~~~~~~~~ include/linux/err.h:22:49: note: expanded from macro 'IS_ERR_VALUE' #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:48:41: note: expanded from macro 'unlikely' # define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x))) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:33:34: note: expanded from macro '__branch_check__' ______r = __builtin_expect(!!(x), expect); \ ^ >> arch/x86/entry/vdso/vma.c:382:9: warning: cast to 'void *' from smaller >> integer type 'int' [-Wint-to-void-pointer-cast] if (!IS_ERR_VALUE(ret)) ^~~~~~~~~~~~~~~~~ include/linux/err.h:22:49: note: expanded from macro 'IS_ERR_VALUE' #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:48:68: note: expanded from macro 'unlikely' # define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x))) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ include/linux/compiler.h:35:19: note: expanded from macro '__branch_check__' expect, is_constant); \ ^~~~~~~~~~~ 3 warnings generated. vim +382 arch/x86/entry/vdso/vma.c 364 365 static int map_vdso_randomized(const struct vdso_image *image) 366 { 367 unsigned long addr; 368 369 if (randomize_va_space == 3) { 370 /* 371 * Randomize vdso address. 372 */ 373 int i = MAX_RANDOM_VDSO_RETRIES; 374 375 do { 376 int ret; 377 378 /* Try a few times to find a free area */ 379 addr = arch_mmap_rnd(); 380 381 ret = map_vdso(image, addr); > 382 if (!IS_ERR_VALUE(ret)) 383 return ret; 384 } while (--i >= 0); 385 386 /* Give up and try the less random way */ 387 } 388 addr = vdso_addr(current->mm->start_stack, image->size-image->sym_vvar_start); 389 390 return map_vdso(image, addr); 391 } 392 #endif 393 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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