Re: [PATCH] staging: vchiq_arm: change vchiq_platform_init from global to static

kernel test robot
2022-04-18T23:19:21Z

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@intel.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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