[PATCH next v3 12/15] printk: introduce a kmsg_dump iterator

[John Ogness]

Hello,

Thank you kernel test robot!

Despite all of my efforts to carefully construct and test this series,
somehome I managed to miss a compile test with CONFIG_MTD_OOPS. That
kmsg_dumper does require the dumper parameter so that it can use
container_of().

I will discuss this with the printk team. But most likely we will just
re-instate the dumper parameter in the callback.

I apologize for the lack of care on my part.

John Ogness

On 2021-02-26, kernel test robot <lkp at intel.com> wrote:
> Hi John,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on next-20210225]
>
> url:    https://github.com/0day-ci/linux/commits/John-Ogness/printk-remove-logbuf_lock/20210226-043457
> base:    7f206cf3ec2bee4621325cfacb2588e5085c07f5
> config: arm-randconfig-r024-20210225 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a921aaf789912d981cbb2036bdc91ad7289e1523)
> 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
>         # install arm cross compiling tool for clang build
>         # apt-get install binutils-arm-linux-gnueabi
>         # https://github.com/0day-ci/linux/commit/fc7f655cded40fc98ba5304c200e3a01e8291fb4
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review John-Ogness/printk-remove-logbuf_lock/20210226-043457
>         git checkout fc7f655cded40fc98ba5304c200e3a01e8291fb4
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
>
> All errors (new ones prefixed by >>):
>
>>> drivers/mtd/mtdoops.c:277:45: error: use of undeclared identifier 'dumper'
>            struct mtdoops_context *cxt = container_of(dumper,
>                                                       ^
>>> drivers/mtd/mtdoops.c:277:45: error: use of undeclared identifier 'dumper'
>>> drivers/mtd/mtdoops.c:277:45: error: use of undeclared identifier 'dumper'
>    3 errors generated.
>
>
> vim +/dumper +277 drivers/mtd/mtdoops.c
>
> 4b23aff083649e Richard Purdie 2007-05-29  274  
> fc7f655cded40f John Ogness    2021-02-25  275  static void mtdoops_do_dump(enum kmsg_dump_reason reason)
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  276  {
> 2e386e4bac9055 Simon Kagstrom 2009-11-03 @277  	struct mtdoops_context *cxt = container_of(dumper,
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  278  			struct mtdoops_context, dump);
> fc7f655cded40f John Ogness    2021-02-25  279  	struct kmsg_dump_iter iter;
> fc2d557c74dc58 Seiji Aguchi   2011-01-12  280  
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  281  	/* Only dump oopses if dump_oops is set */
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  282  	if (reason == KMSG_DUMP_OOPS && !dump_oops)
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  283  		return;
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  284  
> fc7f655cded40f John Ogness    2021-02-25  285  	kmsg_dump_rewind(&iter);
> fc7f655cded40f John Ogness    2021-02-25  286  
> df92cad8a03e83 John Ogness    2021-02-25  287  	if (test_and_set_bit(0, &cxt->oops_buf_busy))
> df92cad8a03e83 John Ogness    2021-02-25  288  		return;
> fc7f655cded40f John Ogness    2021-02-25  289  	kmsg_dump_get_buffer(&iter, true, cxt->oops_buf + MTDOOPS_HEADER_SIZE,
> e2ae715d66bf4b Kay Sievers    2012-06-15  290  			     record_size - MTDOOPS_HEADER_SIZE, NULL);
> df92cad8a03e83 John Ogness    2021-02-25  291  	clear_bit(0, &cxt->oops_buf_busy);
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  292  
> c1cf1d57d14922 Mark Tomlinson 2020-09-03  293  	if (reason != KMSG_DUMP_OOPS) {
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  294  		/* Panics must be written immediately */
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  295  		mtdoops_write(cxt, 1);
> c1cf1d57d14922 Mark Tomlinson 2020-09-03  296  	} else {
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  297  		/* For other cases, schedule work to write it "nicely" */
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  298  		schedule_work(&cxt->work_write);
> 2e386e4bac9055 Simon Kagstrom 2009-11-03  299  	}
> c1cf1d57d14922 Mark Tomlinson 2020-09-03  300  }
> 4b23aff083649e Richard Purdie 2007-05-29  301  
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org