On Sat, Aug 12, 2017 at 04:46:33PM +0800, kbuild test robot wrote:
> Hi Minchan,
> 
> [auto build test ERROR on mmotm/master]
> [also build test ERROR on next-20170811]
> [cannot apply to linus/master v4.13-rc4]
> [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/Minchan-Kim/Replace-rw_page-with-on-stack-bio/20170812-152541
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: sparc64-allmodconfig (attached as .config)
> compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
> reproduce:
>         wget 
> https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O 
> ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=sparc64 
> 
> All errors (new ones prefixed by >>):
> 
>    mm/page_io.c: In function '__swap_writepage':
> >> mm/page_io.c:345:11: error: passing argument 1 of 'bio_get' from 
> >> incompatible pointer type [-Werror=incompatible-pointer-types]
>       bio_get(&bio);
>               ^
>    In file included from include/linux/writeback.h:205:0,
>                     from include/linux/memcontrol.h:31,
>                     from include/linux/swap.h:8,
>                     from mm/page_io.c:17:
>    include/linux/bio.h:252:20: note: expected 'struct bio *' but argument is 
> of type 'struct bio **'
>     static inline void bio_get(struct bio *bio)
>                        ^~~~~~~
>    cc1: some warnings being treated as errors
> 
> vim +/bio_get +345 mm/page_io.c
> 
>    275        
>    276        int __swap_writepage(struct page *page, struct 
> writeback_control *wbc)
>    277        {
>    278                int ret;
>    279                struct swap_info_struct *sis = page_swap_info(page);
>    280                struct bio *bio;
>    281                /* on-stack-bio */
>    282                struct bio sbio;
>    283                struct bio_vec sbvec;
>    284        
>    285                VM_BUG_ON_PAGE(!PageSwapCache(page), page);
>    286                if (sis->flags & SWP_FILE) {
>    287                        struct kiocb kiocb;
>    288                        struct file *swap_file = sis->swap_file;
>    289                        struct address_space *mapping = 
> swap_file->f_mapping;
>    290                        struct bio_vec bv = {
>    291                                .bv_page = page,
>    292                                .bv_len  = PAGE_SIZE,
>    293                                .bv_offset = 0
>    294                        };
>    295                        struct iov_iter from;
>    296        
>    297                        iov_iter_bvec(&from, ITER_BVEC | WRITE, &bv, 1, 
> PAGE_SIZE);
>    298                        init_sync_kiocb(&kiocb, swap_file);
>    299                        kiocb.ki_pos = page_file_offset(page);
>    300        
>    301                        set_page_writeback(page);
>    302                        unlock_page(page);
>    303                        ret = mapping->a_ops->direct_IO(&kiocb, &from);
>    304                        if (ret == PAGE_SIZE) {
>    305                                count_vm_event(PSWPOUT);
>    306                                ret = 0;
>    307                        } else {
>    308                                /*
>    309                                 * In the case of swap-over-nfs, this 
> can be a
>    310                                 * temporary failure if the system has 
> limited
>    311                                 * memory for allocating transmit 
> buffers.
>    312                                 * Mark the page dirty and avoid
>    313                                 * rotate_reclaimable_page but 
> rate-limit the
>    314                                 * messages but do not flag PageError 
> like
>    315                                 * the normal direct-to-bio case as it 
> could
>    316                                 * be temporary.
>    317                                 */
>    318                                set_page_dirty(page);
>    319                                ClearPageReclaim(page);
>    320                                pr_err_ratelimited("Write error on dio 
> swapfile (%llu)\n",
>    321                                                   
> page_file_offset(page));
>    322                        }
>    323                        end_page_writeback(page);
>    324                        return ret;
>    325                }
>    326        
>    327                ret = bdev_write_page(sis->bdev, 
> swap_page_sector(page), page, wbc);
>    328                if (!ret) {
>    329                        count_swpout_vm_event(page);
>    330                        return 0;
>    331                }
>    332        
>    333                ret = 0;
>    334                if (!(sis->flags & SWP_SYNC_IO)) {
>    335        
>    336                        bio = get_swap_bio(GFP_NOIO, page, 
> end_swap_bio_write);
>    337                        if (bio == NULL) {
>    338                                set_page_dirty(page);
>    339                                unlock_page(page);
>    340                                ret = -ENOMEM;
>    341                                goto out;
>    342                        }
>    343                } else {
>    344                        bio = &sbio;
>  > 345                        bio_get(&bio);

Hi kbuild,

I will respin with fixing it.
Thanks for the catching up!



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