tree: https://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-next.git blk-iolatency-v7 head: 4f16e9aa09862911cb7ec38061a48b91a72142c3 commit: 4f16e9aa09862911cb7ec38061a48b91a72142c3 [14/14] skip readahead if the cgroup is congested config: openrisc-or1ksim_defconfig (attached as .config) compiler: or1k-linux-gcc (GCC) 6.0.0 20160327 (experimental) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 4f16e9aa09862911cb7ec38061a48b91a72142c3 # save the attached .config to linux build tree make.cross ARCH=openrisc All errors (new ones prefixed by >>): mm/readahead.c: In function 'page_cache_sync_readahead': >> mm/readahead.c:504:6: error: implicit declaration of function 'blk_cgroup_congested' [-Werror=implicit-function-declaration] if (blk_cgroup_congested()) ^~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/blk_cgroup_congested +504 mm/readahead.c 481 482 /** 483 * page_cache_sync_readahead - generic file readahead 484 * @mapping: address_space which holds the pagecache and I/O vectors 485 * @ra: file_ra_state which holds the readahead state 486 * @filp: passed on to ->readpage() and ->readpages() 487 * @offset: start offset into @mapping, in pagecache page-sized units 488 * @req_size: hint: total size of the read which the caller is performing in 489 * pagecache pages 490 * 491 * page_cache_sync_readahead() should be called when a cache miss happened: 492 * it will submit the read. The readahead logic may decide to piggyback more 493 * pages onto the read request if access patterns suggest it will improve 494 * performance. 495 */ 496 void page_cache_sync_readahead(struct address_space *mapping, 497 struct file_ra_state *ra, struct file *filp, 498 pgoff_t offset, unsigned long req_size) 499 { 500 /* no read-ahead */ 501 if (!ra->ra_pages) 502 return; 503 > 504 if (blk_cgroup_congested()) 505 return; 506 507 /* be dumb */ 508 if (filp && (filp->f_mode & FMODE_RANDOM)) { 509 force_page_cache_readahead(mapping, filp, offset, req_size); 510 return; 511 } 512 513 /* do read-ahead */ 514 ondemand_readahead(mapping, ra, filp, false, offset, req_size); 515 } 516 EXPORT_SYMBOL_GPL(page_cache_sync_readahead); 517 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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