linux-kernel - Re: [PATCH 1/5] irq: generic-chip: provide irq_free_generic

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Date:   Fri, 2 Jun 2017 02:59:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     kbuild-all@...org, Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH 1/5] irq: generic-chip: provide irq_free_generic_chip()

Hi Bartosz,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.12-rc3 next-20170601]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Bartosz-Golaszewski/irq-generic-chip-resource-management-improvements/20170601-055423
config: x86_64-randconfig-n0-06011738 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
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/hardirq.h:5,
                    from include/linux/hardirq.h:8,
                    from include/linux/interrupt.h:12,
                    from arch/x86/include/asm/mshyperv.h:5,
                    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:1182:2: warning: left shift count >= width of type [enabled by default]
     return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
     ^
>> arch/x86/include/asm/pgtable.h:1182:2: warning: left shift count >= width of type [enabled by default]
>> arch/x86/include/asm/pgtable.h:1182:2: warning: left shift count >= width of type [enabled by default]
>> arch/x86/include/asm/pgtable.h:1182:2: warning: left shift count >= width of type [enabled by default]
   arch/x86/include/asm/pgtable.h:1182:2: warning: right shift count >= width of type [enabled by default]

vim +1182 arch/x86/include/asm/pgtable.h

33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1166  }
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1167  
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1168  static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1169  {
845942969 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1170  	int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1171  	/*
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1172  	 * Access-disable disables writes too so we need to check
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1173  	 * both bits here.
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1174  	 */
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1175  	return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1176  }
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1177  
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1178  static inline u16 pte_flags_pkey(unsigned long pte_flags)
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1179  {
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1180  #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1181  	/* ifdef to avoid doing 59-bit shift on 32-bit values */
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12 @1182  	return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1183  #else
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1184  	return 0;
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1185  #endif
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1186  }
33a709b25 arch/x86/include/asm/pgtable.h Dave Hansen         2016-02-12  1187  
195466dc4 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  1188  #include <asm-generic/pgtable.h>
195466dc4 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  1189  #endif	/* __ASSEMBLY__ */
195466dc4 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  1190  

:::::: The code at line 1182 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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