[PATCH v2 1/2] riscv: Add STACKPROTECTOR supported

kernel test robot lkp at intel.com
Thu Jul 9 14:36:17 EDT 2020


I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.8-rc4 next-20200709]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in

url:    https://github.com/0day-ci/linux/commits/guoren-kernel-org/riscv-Add-STACKPROTECTOR-supported/20200709-153112
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0bddd227f3dc55975e2b8dfa7fc6f959b062a2c7
config: riscv-randconfig-s031-20200709 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.2-37-gc9676a3b-dirty
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/stackprotector.h:10,
                    from arch/riscv/kernel/process.c:28:
   arch/riscv/include/asm/stackprotector.h: In function 'boot_init_stack_canary':
>> arch/riscv/include/asm/stackprotector.h:26:23: warning: left shift count >= width of type [-Wshift-count-overflow]
      26 |  canary += tsc + (tsc << 32UL);
         |                       ^~
   arch/riscv/kernel/process.c: At top level:
   arch/riscv/kernel/process.c:42:6: warning: no previous prototype for 'show_regs' [-Wmissing-prototypes]
      42 | void show_regs(struct pt_regs *regs)
         |      ^~~~~~~~~
   arch/riscv/kernel/process.c:103:5: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes]
     103 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
         |     ^~~~~~~~~~~~~~~~~~~~

vim +26 arch/riscv/include/asm/stackprotector.h

    12	/*
    13	 * Initialize the stackprotector canary value.
    14	 *
    15	 * NOTE: this must only be called from functions that never return,
    16	 * and it must always be inlined.
    17	 */
    18	static __always_inline void boot_init_stack_canary(void)
    19	{
    20		unsigned long canary;
    21		unsigned long tsc;
    23		/* Try to get a semi random initial value. */
    24		get_random_bytes(&canary, sizeof(canary));
    25		tsc = get_cycles();
  > 26		canary += tsc + (tsc << 32UL);

0-DAY CI Kernel Test Service, Intel Corporation
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