Re: [PATCH] mm: move page-writeback sysctls to is own file

From: Luis Chamberlain
Date: Tue Feb 01 2022 - 21:41:16 EST

Likewise here, these test results are assuming an older kernel. Instead
linux-next can be a better target to test for for these patches.

Luis

On Sat, Jan 29, 2022 at 01:16:53AM +0800, kernel test robot wrote:
> Hi zhanglianjie,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v5.17-rc1 next-20220128]
> [cannot apply to hnaz-mm/master linux/master kees/for-next/pstore]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url: https://github.com/0day-ci/linux/commits/zhanglianjie/mm-move-page-writeback-sysctls-to-is-own-file/20220128-172052
> base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 23a46422c56144939c091c76cf389aa863ce9c18
> config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220129/202201290051.7pu9CEMG-lkp@xxxxxxxxx/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
> # https://github.com/0day-ci/linux/commit/d24502aa729978894feb2de10481cd139ae5bb42
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review zhanglianjie/mm-move-page-writeback-sysctls-to-is-own-file/20220128-172052
> git checkout d24502aa729978894feb2de10481cd139ae5bb42
> # save the config file to linux build tree
> mkdir build_dir
> make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All warnings (new ones prefixed by >>):
>
> >> mm/page-writeback.c:509:5: warning: no previous prototype for 'dirty_background_ratio_handler' [-Wmissing-prototypes]
> 509 | int dirty_background_ratio_handler(struct ctl_table *table, int write,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> mm/page-writeback.c:520:5: warning: no previous prototype for 'dirty_background_bytes_handler' [-Wmissing-prototypes]
> 520 | int dirty_background_bytes_handler(struct ctl_table *table, int write,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> mm/page-writeback.c:531:5: warning: no previous prototype for 'dirty_ratio_handler' [-Wmissing-prototypes]
> 531 | int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
> | ^~~~~~~~~~~~~~~~~~~
> >> mm/page-writeback.c:545:5: warning: no previous prototype for 'dirty_bytes_handler' [-Wmissing-prototypes]
> 545 | int dirty_bytes_handler(struct ctl_table *table, int write,
> | ^~~~~~~~~~~~~~~~~~~
> >> mm/page-writeback.c:2002:5: warning: no previous prototype for 'dirty_writeback_centisecs_handler' [-Wmissing-prototypes]
> 2002 | int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
> vim +/dirty_background_ratio_handler +509 mm/page-writeback.c
>
> a756cf5908530e Johannes Weiner 2012-01-10 508
> 2da02997e08d3e David Rientjes 2009-01-06 @509 int dirty_background_ratio_handler(struct ctl_table *table, int write,
> 32927393dc1ccd Christoph Hellwig 2020-04-24 510 void *buffer, size_t *lenp, loff_t *ppos)
> 2da02997e08d3e David Rientjes 2009-01-06 511 {
> 2da02997e08d3e David Rientjes 2009-01-06 512 int ret;
> 2da02997e08d3e David Rientjes 2009-01-06 513
> 8d65af789f3e2c Alexey Dobriyan 2009-09-23 514 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
> 2da02997e08d3e David Rientjes 2009-01-06 515 if (ret == 0 && write)
> 2da02997e08d3e David Rientjes 2009-01-06 516 dirty_background_bytes = 0;
> 2da02997e08d3e David Rientjes 2009-01-06 517 return ret;
> 2da02997e08d3e David Rientjes 2009-01-06 518 }
> 2da02997e08d3e David Rientjes 2009-01-06 519
> 2da02997e08d3e David Rientjes 2009-01-06 @520 int dirty_background_bytes_handler(struct ctl_table *table, int write,
> 32927393dc1ccd Christoph Hellwig 2020-04-24 521 void *buffer, size_t *lenp, loff_t *ppos)
> 2da02997e08d3e David Rientjes 2009-01-06 522 {
> 2da02997e08d3e David Rientjes 2009-01-06 523 int ret;
> 2da02997e08d3e David Rientjes 2009-01-06 524
> 8d65af789f3e2c Alexey Dobriyan 2009-09-23 525 ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
> 2da02997e08d3e David Rientjes 2009-01-06 526 if (ret == 0 && write)
> 2da02997e08d3e David Rientjes 2009-01-06 527 dirty_background_ratio = 0;
> 2da02997e08d3e David Rientjes 2009-01-06 528 return ret;
> 2da02997e08d3e David Rientjes 2009-01-06 529 }
> 2da02997e08d3e David Rientjes 2009-01-06 530
> 32927393dc1ccd Christoph Hellwig 2020-04-24 @531 int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
> 32927393dc1ccd Christoph Hellwig 2020-04-24 532 size_t *lenp, loff_t *ppos)
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 533 {
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 534 int old_ratio = vm_dirty_ratio;
> 2da02997e08d3e David Rientjes 2009-01-06 535 int ret;
> 2da02997e08d3e David Rientjes 2009-01-06 536
> 8d65af789f3e2c Alexey Dobriyan 2009-09-23 537 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 538 if (ret == 0 && write && vm_dirty_ratio != old_ratio) {
> eb608e3a344b3a Jan Kara 2012-05-24 539 writeback_set_ratelimit();
> 2da02997e08d3e David Rientjes 2009-01-06 540 vm_dirty_bytes = 0;
> 2da02997e08d3e David Rientjes 2009-01-06 541 }
> 2da02997e08d3e David Rientjes 2009-01-06 542 return ret;
> 2da02997e08d3e David Rientjes 2009-01-06 543 }
> 2da02997e08d3e David Rientjes 2009-01-06 544
> 2da02997e08d3e David Rientjes 2009-01-06 @545 int dirty_bytes_handler(struct ctl_table *table, int write,
> 32927393dc1ccd Christoph Hellwig 2020-04-24 546 void *buffer, size_t *lenp, loff_t *ppos)
> 2da02997e08d3e David Rientjes 2009-01-06 547 {
> fc3501d411d348 Sven Wegener 2009-02-11 548 unsigned long old_bytes = vm_dirty_bytes;
> 2da02997e08d3e David Rientjes 2009-01-06 549 int ret;
> 2da02997e08d3e David Rientjes 2009-01-06 550
> 8d65af789f3e2c Alexey Dobriyan 2009-09-23 551 ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
> 2da02997e08d3e David Rientjes 2009-01-06 552 if (ret == 0 && write && vm_dirty_bytes != old_bytes) {
> eb608e3a344b3a Jan Kara 2012-05-24 553 writeback_set_ratelimit();
> 2da02997e08d3e David Rientjes 2009-01-06 554 vm_dirty_ratio = 0;
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 555 }
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 556 return ret;
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 557 }
> 04fbfdc14e5f48 Peter Zijlstra 2007-10-16 558
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx