linux-kernel - [tip:x86/cpu 5/7] arch/x86/mm/tlb.c:355:13: sparse: sparse: incorrect type in initializer (different address spaces)

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Message-ID: <202107282245.jRDg1h8Y-lkp@intel.com>
Date:   Wed, 28 Jul 2021 22:18:49 +0800
From:   kernel test robot <lkp@...el.com>
To:     Balbir Singh <sblbir@...zon.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:x86/cpu 5/7] arch/x86/mm/tlb.c:355:13: sparse: sparse:
 incorrect type in initializer (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cpu
head:   b7fe54f6c2d437082dcbecfbd832f38edd9caaf4
commit: b5f06f64e269f9820cd5ad9e9a98afa6c8914b7a [5/7] x86/mm: Prepare for opt-in based L1D flush in switch_mm()
config: x86_64-randconfig-s032-20210728 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=b5f06f64e269f9820cd5ad9e9a98afa6c8914b7a
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip x86/cpu
        git checkout b5f06f64e269f9820cd5ad9e9a98afa6c8914b7a
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


sparse warnings: (new ones prefixed by >>)
>> arch/x86/mm/tlb.c:355:13: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected void const [noderef] __percpu *__vpp_verify @@     got bool * @@
   arch/x86/mm/tlb.c:355:13: sparse:     expected void const [noderef] __percpu *__vpp_verify
   arch/x86/mm/tlb.c:355:13: sparse:     got bool *

vim +355 arch/x86/mm/tlb.c

   337	
   338	static void l1d_flush_evaluate(unsigned long prev_mm, unsigned long next_mm,
   339					struct task_struct *next)
   340	{
   341		/* Flush L1D if the outgoing task requests it */
   342		if (prev_mm & LAST_USER_MM_L1D_FLUSH)
   343			wrmsrl(MSR_IA32_FLUSH_CMD, L1D_FLUSH);
   344	
   345		/* Check whether the incoming task opted in for L1D flush */
   346		if (likely(!(next_mm & LAST_USER_MM_L1D_FLUSH)))
   347			return;
   348	
   349		/*
   350		 * Validate that it is not running on an SMT sibling as this would
   351		 * make the excercise pointless because the siblings share L1D. If
   352		 * it runs on a SMT sibling, notify it with SIGBUS on return to
   353		 * user/guest
   354		 */
 > 355		if (this_cpu_read(cpu_info.smt_active)) {
   356			clear_ti_thread_flag(&next->thread_info, TIF_SPEC_L1D_FLUSH);
   357			next->l1d_flush_kill.func = l1d_flush_force_sigbus;
   358			task_work_add(next, &next->l1d_flush_kill, TWA_RESUME);
   359		}
   360	}
   361	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (32385 bytes)