linux-kernel - Re: [PATCH] scsi: target: tcmu: Call flush_dcache

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Date:   Sat, 20 Jun 2020 09:31:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Henry Willard <henry.willard@...cle.com>,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org
Subject: Re: [PATCH] scsi: target: tcmu: Call flush_dcache_page() with proper
 page struct

Hi Henry,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on scsi/for-next v5.8-rc1 next-20200618]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Henry-Willard/scsi-target-tcmu-Call-flush_dcache_page-with-proper-page-struct/20200620-024740
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 

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 >>, old ones prefixed by <<):

In file included from include/linux/kernel.h:11,
from include/linux/list.h:9,
from include/linux/preempt.h:11,
from include/linux/spinlock.h:51,
from drivers/target/target_core_user.c:9:
include/linux/scatterlist.h: In function 'sg_set_buf':
arch/xtensa/include/asm/page.h:193:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
193 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
|         ^~
include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
78 | # define unlikely(x) __builtin_expect(!!(x), 0)
|                                          ^
include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
143 |  BUG_ON(!virt_addr_valid(buf));
|  ^~~~~~
arch/xtensa/include/asm/page.h:201:32: note: in expansion of macro 'pfn_valid'
201 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
|                                ^~~~~~~~~
include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
143 |  BUG_ON(!virt_addr_valid(buf));
|          ^~~~~~~~~~~~~~~
In file included from ./arch/xtensa/include/generated/asm/bug.h:1,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from include/asm-generic/preempt.h:5,
from ./arch/xtensa/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from drivers/target/target_core_user.c:9:
include/linux/dma-mapping.h: In function 'dma_map_resource':
arch/xtensa/include/asm/page.h:193:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
193 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
|         ^~
include/asm-generic/bug.h:144:27: note: in definition of macro 'WARN_ON_ONCE'
144 |  int __ret_warn_once = !!(condition);            |                           ^~~~~~~~~
include/linux/dma-mapping.h:352:19: note: in expansion of macro 'pfn_valid'
352 |  if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
|                   ^~~~~~~~~
In file included from include/linux/mm_types_task.h:16,
from include/linux/mm_types.h:5,
from include/linux/mmzone.h:21,
from include/linux/gfp.h:6,
from include/linux/umh.h:4,
from include/linux/kmod.h:9,
from include/linux/module.h:16,
from drivers/target/target_core_user.c:10:
drivers/target/target_core_user.c: In function 'tcmu_flush_dcache_range':
arch/xtensa/include/asm/page.h:193:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
193 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
|         ^~
arch/xtensa/include/asm/page.h:201:32: note: in expansion of macro 'pfn_valid'
201 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
|                                ^~~~~~~~~
drivers/target/target_core_user.c:605:7: note: in expansion of macro 'virt_addr_valid'
605 |   if (virt_addr_valid(start))
|       ^~~~~~~~~~~~~~~
>> drivers/target/target_core_user.c:600:15: warning: variable 'pg' set but not used [-Wunused-but-set-variable]
600 |  struct page *pg;
|               ^~

vim +/pg +600 drivers/target/target_core_user.c

   595	
   596	static inline void tcmu_flush_dcache_range(void *vaddr, size_t size)
   597	{
   598		unsigned long offset = offset_in_page(vaddr);
   599		void *start = vaddr - offset;
 > 600		struct page *pg;
   601	
   602		size = round_up(size+offset, PAGE_SIZE);
   603	
   604		while (size) {
   605			if (virt_addr_valid(start))
   606				pg = virt_to_page(start);
   607			else if (is_vmalloc_addr(start))
   608				pg = vmalloc_to_page(start);
   609			else
   610				break;
   611	
   612			flush_dcache_page(pg);
   613			start += PAGE_SIZE;
   614			size -= PAGE_SIZE;
   615		}
   616	}
   617	

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

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