linux-kernel - Re: [PATCH char-misc 1/1] Drivers: hv: vmbus: Implement Direct Mode for stimer0

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Date:   Sat, 4 Nov 2017 06:55:06 +0800
From:   kbuild test robot <lkp@...el.com>
To:     mikelley@...hange.microsoft.com
Cc:     kbuild-all@...org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
        jasowang@...hat.com, leann.ogasawara@...onical.com,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com,
        kys@...rosoft.com, Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [PATCH char-misc 1/1] Drivers: hv: vmbus: Implement Direct Mode
 for stimer0

Hi Michael,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/master]

url:    https://github.com/0day-ci/linux/commits/mikelley-exchange-microsoft-com/Drivers-hv-vmbus-Implement-Direct-Mode-for-stimer0/20171103-214519
config: x86_64-randconfig-h0-11040619 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kasan.h:16:0,
                    from include/linux/slab.h:120,
                    from include/linux/irq.h:25,
                    from arch/x86/include/asm/mshyperv.h:7,
                    from arch/x86/entry/vdso/vdso32/../vclock_gettime.c:20,
                    from arch/x86/entry/vdso/vdso32/vclock_gettime.c:32:
   arch/x86/include/asm/pgtable.h: In function 'pte_flags_pkey':
>> arch/x86/include/asm/pgtable.h:1199:2: warning: left shift count >= width of type
     return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
     ^
>> arch/x86/include/asm/pgtable.h:1199:2: warning: left shift count >= width of type
>> arch/x86/include/asm/pgtable.h:1199:2: warning: left shift count >= width of type
>> arch/x86/include/asm/pgtable.h:1199:2: warning: left shift count >= width of type
   arch/x86/include/asm/pgtable.h:1199:2: warning: right shift count >= width of type

vim +1199 arch/x86/include/asm/pgtable.h

33a709b2 Dave Hansen 2016-02-12  1194  
33a709b2 Dave Hansen 2016-02-12  1195  static inline u16 pte_flags_pkey(unsigned long pte_flags)
33a709b2 Dave Hansen 2016-02-12  1196  {
33a709b2 Dave Hansen 2016-02-12  1197  #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
33a709b2 Dave Hansen 2016-02-12  1198  	/* ifdef to avoid doing 59-bit shift on 32-bit values */
33a709b2 Dave Hansen 2016-02-12 @1199  	return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
33a709b2 Dave Hansen 2016-02-12  1200  #else
33a709b2 Dave Hansen 2016-02-12  1201  	return 0;
33a709b2 Dave Hansen 2016-02-12  1202  #endif
33a709b2 Dave Hansen 2016-02-12  1203  }
33a709b2 Dave Hansen 2016-02-12  1204  

:::::: The code at line 1199 was first introduced by commit
:::::: 33a709b25a760b91184bb335cf7d7c32b8123013 mm/gup, x86/mm/pkeys: Check VMAs and PTEs for protection keys

:::::: TO: Dave Hansen <dave.hansen@...ux.intel.com>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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0-DAY kernel test infrastructure                Open Source Technology Center
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