linux-kernel - arch/riscv/kernel/signal.c:94:16: sparse: sparse: incorrect type in initializer (different address spaces)

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Message-ID: <202307171012.U1gkffCQ-lkp@intel.com>
Date:   Mon, 17 Jul 2023 10:20:16 +0800
From:   kernel test robot <lkp@...el.com>
To:     Guo Ren <guoren@...ux.alibaba.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Andy Chiu <andy.chiu@...ive.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: arch/riscv/kernel/signal.c:94:16: sparse: sparse: incorrect type in
 initializer (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5b8d6e8539498e8b2fa67fbcce3fe87834d44a7a
commit: fa8e7cce55da3569259dc270801885c420eb50fe riscv: Enable Vector code to be built
date:   6 weeks ago
config: riscv-randconfig-r071-20230717 (https://download.01.org/0day-ci/archive/20230717/202307171012.U1gkffCQ-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230717/202307171012.U1gkffCQ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307171012.U1gkffCQ-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   WARNING: invalid argument to '-march': '_zihintpause'
>> arch/riscv/kernel/signal.c:94:16: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected void *__val @@     got void [noderef] __user *[assigned] datap @@
   arch/riscv/kernel/signal.c:94:16: sparse:     expected void *__val
   arch/riscv/kernel/signal.c:94:16: sparse:     got void [noderef] __user *[assigned] datap

vim +94 arch/riscv/kernel/signal.c

8ee0b41898fa26 Greentime Hu 2023-06-05   72  
8ee0b41898fa26 Greentime Hu 2023-06-05   73  static long save_v_state(struct pt_regs *regs, void __user **sc_vec)
8ee0b41898fa26 Greentime Hu 2023-06-05   74  {
8ee0b41898fa26 Greentime Hu 2023-06-05   75  	struct __riscv_ctx_hdr __user *hdr;
8ee0b41898fa26 Greentime Hu 2023-06-05   76  	struct __sc_riscv_v_state __user *state;
8ee0b41898fa26 Greentime Hu 2023-06-05   77  	void __user *datap;
8ee0b41898fa26 Greentime Hu 2023-06-05   78  	long err;
8ee0b41898fa26 Greentime Hu 2023-06-05   79  
8ee0b41898fa26 Greentime Hu 2023-06-05   80  	hdr = *sc_vec;
8ee0b41898fa26 Greentime Hu 2023-06-05   81  	/* Place state to the user's signal context space after the hdr */
8ee0b41898fa26 Greentime Hu 2023-06-05   82  	state = (struct __sc_riscv_v_state __user *)(hdr + 1);
8ee0b41898fa26 Greentime Hu 2023-06-05   83  	/* Point datap right after the end of __sc_riscv_v_state */
8ee0b41898fa26 Greentime Hu 2023-06-05   84  	datap = state + 1;
8ee0b41898fa26 Greentime Hu 2023-06-05   85  
8ee0b41898fa26 Greentime Hu 2023-06-05   86  	/* datap is designed to be 16 byte aligned for better performance */
8ee0b41898fa26 Greentime Hu 2023-06-05   87  	WARN_ON(unlikely(!IS_ALIGNED((unsigned long)datap, 16)));
8ee0b41898fa26 Greentime Hu 2023-06-05   88  
8ee0b41898fa26 Greentime Hu 2023-06-05   89  	riscv_v_vstate_save(current, regs);
8ee0b41898fa26 Greentime Hu 2023-06-05   90  	/* Copy everything of vstate but datap. */
8ee0b41898fa26 Greentime Hu 2023-06-05   91  	err = __copy_to_user(&state->v_state, &current->thread.vstate,
8ee0b41898fa26 Greentime Hu 2023-06-05   92  			     offsetof(struct __riscv_v_ext_state, datap));
8ee0b41898fa26 Greentime Hu 2023-06-05   93  	/* Copy the pointer datap itself. */
8ee0b41898fa26 Greentime Hu 2023-06-05  @94  	err |= __put_user(datap, &state->v_state.datap);
8ee0b41898fa26 Greentime Hu 2023-06-05   95  	/* Copy the whole vector content to user space datap. */
8ee0b41898fa26 Greentime Hu 2023-06-05   96  	err |= __copy_to_user(datap, current->thread.vstate.datap, riscv_v_vsize);
8ee0b41898fa26 Greentime Hu 2023-06-05   97  	/* Copy magic to the user space after saving  all vector conetext */
8ee0b41898fa26 Greentime Hu 2023-06-05   98  	err |= __put_user(RISCV_V_MAGIC, &hdr->magic);
8ee0b41898fa26 Greentime Hu 2023-06-05   99  	err |= __put_user(riscv_v_sc_size, &hdr->size);
8ee0b41898fa26 Greentime Hu 2023-06-05  100  	if (unlikely(err))
8ee0b41898fa26 Greentime Hu 2023-06-05  101  		return err;
8ee0b41898fa26 Greentime Hu 2023-06-05  102  
8ee0b41898fa26 Greentime Hu 2023-06-05  103  	/* Only progress the sv_vec if everything has done successfully  */
8ee0b41898fa26 Greentime Hu 2023-06-05  104  	*sc_vec += riscv_v_sc_size;
8ee0b41898fa26 Greentime Hu 2023-06-05  105  	return 0;
8ee0b41898fa26 Greentime Hu 2023-06-05  106  }
8ee0b41898fa26 Greentime Hu 2023-06-05  107  

:::::: The code at line 94 was first introduced by commit
:::::: 8ee0b41898fa26f66e32237f179b6989c65600d6 riscv: signal: Add sigcontext save/restore for vector

:::::: TO: Greentime Hu <greentime.hu@...ive.com>
:::::: CC: Palmer Dabbelt <palmer@...osinc.com>

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