linux-kernel - [tglx-devel:x86/fpu 74/82] arch/x86/kernel/fpu/xstate.c:1314:14: warning: comparison between pointer and integer

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Date:   Fri, 15 Oct 2021 16:24:16 +0800
From:   kernel test robot <lkp@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [tglx-devel:x86/fpu 74/82] arch/x86/kernel/fpu/xstate.c:1314:14:
 warning: comparison between pointer and integer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/fpu
head:   fbeb78415a1b32f890fa49e4355faa02bb0c0602
commit: 14b0c6c4efcd1654d291d501cca977f3476a5c10 [74/82] x86/fpu: Add sanity checks for XFD
config: x86_64-randconfig-a006-20211014 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=14b0c6c4efcd1654d291d501cca977f3476a5c10
        git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
        git fetch --no-tags tglx-devel x86/fpu
        git checkout 14b0c6c4efcd1654d291d501cca977f3476a5c10
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/fpu/

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

All warnings (new ones prefixed by >>):

   arch/x86/kernel/fpu/xstate.c: In function 'xfd_valid':
>> arch/x86/kernel/fpu/xstate.c:1314:14: warning: comparison between pointer and integer
    1314 |  if (fpstate == current->thread.fpu.fpstate->xfd)
         |              ^~


vim +1314 arch/x86/kernel/fpu/xstate.c

  1304	
  1305	#ifdef CONFIG_X86_DEBUG_FPU
  1306	static inline bool xfd_valid(struct fpstate *fpstate, u64 mask, bool rstor)
  1307	{
  1308		u64 xfd = __this_cpu_read(xfd_state);
  1309	
  1310		if (fpstate->xfd == xfd)
  1311			return true;
  1312	
  1313		/* For current's fpstate the XFD state must be correct. */
> 1314		if (fpstate == current->thread.fpu.fpstate->xfd)
  1315			return false;
  1316	
  1317		/*
  1318		 * XRSTOR(S) from init_fpstate are always correct as it will just
  1319		 * bring all components into init state and not read from the
  1320		 * buffer. XSAVE(S) raises #PF after init.
  1321		 */
  1322		if (fpstate == &init_fpstate)
  1323			return rstor;
  1324	
  1325		/*
  1326		 * XSAVE(S): clone(), fpu_swap_kvm_fpu()
  1327		 * XRSTORS(S): fpu_swap_kvm_fpu()
  1328		 */
  1329	
  1330		/* Remove XFD disabled states from the mask. */
  1331		mask &= ~xfd;
  1332		/* Remove features which are valid in fpstate. */
  1333		mask &= ~fpstate->xfeatures;
  1334	
  1335		/*
  1336		 * Mask should be zero now which means no loads/stores
  1337		 * past the end of the register state buffer.
  1338		 */
  1339		return !mask;
  1340	}
  1341	

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

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