Re: [PATCH 08/14] zram: check that backends array has at least one backend

From: kernel test robot
Date: Sat May 04 2024 - 03:16:33 EST


Hi Sergey,

kernel test robot noticed the following build errors:

[auto build test ERROR on axboe-block/for-next]
[also build test ERROR on akpm-mm/mm-everything linus/master v6.9-rc6 next-20240503]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Sergey-Senozhatsky/zram-move-from-crypto-API-to-custom-comp-backends-API/20240503-172335
base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
patch link: https://lore.kernel.org/r/20240503091823.3616962-9-senozhatsky%40chromium.org
patch subject: [PATCH 08/14] zram: check that backends array has at least one backend
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20240504/202405041458.j3L25KZg-lkp@xxxxxxxxx/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240504/202405041458.j3L25KZg-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405041458.j3L25KZg-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

In file included from <command-line>:
drivers/block/zram/zcomp.c: In function 'zcomp_create':
>> include/linux/compiler_types.h:449:45: error: call to '__compiletime_assert_419' declared with attribute error: BUILD_BUG_ON failed: ARRAY_SIZE(backends) <= 1
449 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
include/linux/compiler_types.h:430:25: note: in definition of macro '__compiletime_assert'
430 | prefix ## suffix(); \
| ^~~~~~
include/linux/compiler_types.h:449:9: note: in expansion of macro '_compiletime_assert'
449 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^~~~~~~~~~~~~~~~
drivers/block/zram/zcomp.c:214:9: note: in expansion of macro 'BUILD_BUG_ON'
214 | BUILD_BUG_ON(ARRAY_SIZE(backends) <= 1);
| ^~~~~~~~~~~~


vim +/__compiletime_assert_419 +449 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21 435
eb5c2d4b45e3d2 Will Deacon 2020-07-21 436 #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 437 __compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21 438
eb5c2d4b45e3d2 Will Deacon 2020-07-21 439 /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21 440 * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21 441 * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21 442 * @msg: a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21 443 *
eb5c2d4b45e3d2 Will Deacon 2020-07-21 444 * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21 445 * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21 446 * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21 447 */
eb5c2d4b45e3d2 Will Deacon 2020-07-21 448 #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @449 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21 450

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