linux-kernel - Re: [PATCH] staging: vchiq_arm: change vchiq_platform

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Date:   Tue, 19 Apr 2022 07:19:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Tom Rix <trix@...hat.com>, nsaenz@...nel.org,
        bcm-kernel-feedback-list@...adcom.com, gregkh@...uxfoundation.org,
        stefan.wahren@...e.com, gascoar@...il.com, ojaswin98@...il.com
Cc:     kbuild-all@...ts.01.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: Re: [PATCH] staging: vchiq_arm: change vchiq_platform_init from
 global to static

Hi Tom,

I love your patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing]

url:    https://github.com/intel-lab-lkp/linux/commits/Tom-Rix/staging-vchiq_arm-change-vchiq_platform_init-from-global-to-static/20220419-004611
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git bed6d200f8ca38e1ecbdd8fb7e0564884002abd1
config: parisc-buildonly-randconfig-r004-20220417 (https://download.01.org/0day-ci/archive/20220419/202204190737.qhFLAafo-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/192ca8cdfd692f17162557c64e8d533c816eccff
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tom-Rix/staging-vchiq_arm-change-vchiq_platform_init-from-global-to-static/20220419-004611
        git checkout 192ca8cdfd692f17162557c64e8d533c816eccff
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc SHELL=/bin/bash drivers/staging/vc04_services/

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 >>):

   In file included from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:16:
   In function 'memcpy_to_page',
       inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:434:4:
>> include/linux/highmem.h:353:9: warning: argument 2 null where non-null expected [-Wnonnull]
     353 |         memcpy(to + offset, from, len);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/string.h:20,
                    from include/linux/bitmap.h:11,
                    from include/linux/cpumask.h:12,
                    from include/linux/mm_types_task.h:14,
                    from include/linux/mm_types.h:5,
                    from include/linux/buildid.h:5,
                    from include/linux/module.h:14,
                    from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:8:
   drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c: In function 'free_pagelist':
   arch/parisc/include/asm/string.h:9:8: note: in a call to function 'memcpy' declared 'nonnull'
       9 | void * memcpy(void * dest,const void *src,size_t count);
         |        ^~~~~~
   In file included from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:16:
   In function 'memcpy_to_page',
       inlined from 'free_pagelist' at drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:441:4:
>> include/linux/highmem.h:353:9: warning: 'memcpy' offset 0 is out of the bounds [0, 0] [-Warray-bounds]
     353 |         memcpy(to + offset, from, len);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +353 include/linux/highmem.h

bb90d4bc7b6a53 Ira Weiny         2021-02-09  346  
bb90d4bc7b6a53 Ira Weiny         2021-02-09  347  static inline void memcpy_to_page(struct page *page, size_t offset,
bb90d4bc7b6a53 Ira Weiny         2021-02-09  348  				  const char *from, size_t len)
bb90d4bc7b6a53 Ira Weiny         2021-02-09  349  {
61b205f579911a Ira Weiny         2021-02-09  350  	char *to = kmap_local_page(page);
bb90d4bc7b6a53 Ira Weiny         2021-02-09  351  
ca18f6ea012bf3 Ira Weiny         2021-02-10  352  	VM_BUG_ON(offset + len > PAGE_SIZE);
bb90d4bc7b6a53 Ira Weiny         2021-02-09 @353  	memcpy(to + offset, from, len);
8dad53a11f8d94 Christoph Hellwig 2021-07-23  354  	flush_dcache_page(page);
61b205f579911a Ira Weiny         2021-02-09  355  	kunmap_local(to);
bb90d4bc7b6a53 Ira Weiny         2021-02-09  356  }
bb90d4bc7b6a53 Ira Weiny         2021-02-09  357  

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