* include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
@ 2026-01-23 0:58 kernel test robot
2026-01-23 10:15 ` Marek Vasut
0 siblings, 1 reply; 3+ messages in thread
From: kernel test robot @ 2026-01-23 0:58 UTC (permalink / raw)
To: Marek Vasut; +Cc: oe-kbuild-all, linux-kernel, Tomi Valkeinen
Hi Marek,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: a66191c590b3b58eaff05d2277971f854772bd5b
commit: 4f716a1db661cfb31502a0a6d7e62c06daf2e603 drm/rcar-du: dsi: Convert register bitfields to GENMASK() macro
date: 3 months ago
config: arc-randconfig-r053-20260123 (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601230809.FBjF6OrH-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from <command-line>:
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c: In function 'rcar_mipi_dsi_startup.isra.6':
>> include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:578:4: note: in definition of macro '__compiletime_assert'
prefix ## suffix(); \
^~~~~~
include/linux/compiler_types.h:597:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/bitfield.h:68:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \
^~~~~~~~~~~~~~~~
include/linux/bitfield.h:115:3: note: in expansion of macro '__BF_FIELD_CHECK'
__BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
^~~~~~~~~~~~~~~~
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h:259:29: note: in expansion of macro 'FIELD_PREP'
#define VCLKSET_DIV_V4H(n) FIELD_PREP(VCLKSET_DIV_V4H_MASK, (n))
^~~~~~~~~~
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c:660:14: note: in expansion of macro 'VCLKSET_DIV_V4H'
vclkset |= VCLKSET_DIV_V4H(__ffs(setup_info.vclk_divider) - 1);
^~~~~~~~~~~~~~~
vim +/__compiletime_assert_495 +597 include/linux/compiler_types.h
eb5c2d4b45e3d2d Will Deacon 2020-07-21 583
eb5c2d4b45e3d2d Will Deacon 2020-07-21 584 #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 585 __compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2d Will Deacon 2020-07-21 586
eb5c2d4b45e3d2d Will Deacon 2020-07-21 587 /**
eb5c2d4b45e3d2d Will Deacon 2020-07-21 588 * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21 589 * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2d Will Deacon 2020-07-21 590 * @msg: a message to emit if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21 591 *
eb5c2d4b45e3d2d Will Deacon 2020-07-21 592 * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21 593 * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21 594 * compiler has support to do so.
eb5c2d4b45e3d2d Will Deacon 2020-07-21 595 */
eb5c2d4b45e3d2d Will Deacon 2020-07-21 596 #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 @597 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2d Will Deacon 2020-07-21 598
:::::: The code at line 597 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h
:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
2026-01-23 0:58 include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field kernel test robot
@ 2026-01-23 10:15 ` Marek Vasut
2026-01-23 15:52 ` Laurent Pinchart
0 siblings, 1 reply; 3+ messages in thread
From: Marek Vasut @ 2026-01-23 10:15 UTC (permalink / raw)
To: kernel test robot, Laurent Pinchart, Tomi Valkeinen
Cc: oe-kbuild-all, linux-kernel, Tomi Valkeinen
On 1/23/26 1:58 AM, kernel test robot wrote:
> Hi Marek,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: a66191c590b3b58eaff05d2277971f854772bd5b
> commit: 4f716a1db661cfb31502a0a6d7e62c06daf2e603 drm/rcar-du: dsi: Convert register bitfields to GENMASK() macro
> date: 3 months ago
> config: arc-randconfig-r053-20260123 (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/config)
> compiler: arc-linux-gcc (GCC) 8.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202601230809.FBjF6OrH-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> In file included from <command-line>:
> drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c: In function 'rcar_mipi_dsi_startup.isra.6':
>>> include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^
> include/linux/compiler_types.h:578:4: note: in definition of macro '__compiletime_assert'
> prefix ## suffix(); \
> ^~~~~~
> include/linux/compiler_types.h:597:2: note: in expansion of macro '_compiletime_assert'
> _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> ^~~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
> #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> ^~~~~~~~~~~~~~~~~~
> include/linux/bitfield.h:68:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
> BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \
> ^~~~~~~~~~~~~~~~
> include/linux/bitfield.h:115:3: note: in expansion of macro '__BF_FIELD_CHECK'
> __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
> ^~~~~~~~~~~~~~~~
> drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h:259:29: note: in expansion of macro 'FIELD_PREP'
> #define VCLKSET_DIV_V4H(n) FIELD_PREP(VCLKSET_DIV_V4H_MASK, (n))
> ^~~~~~~~~~
> drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c:660:14: note: in expansion of macro 'VCLKSET_DIV_V4H'
> vclkset |= VCLKSET_DIV_V4H(__ffs(setup_info.vclk_divider) - 1);
> ^~~~~~~~~~~~~~~
Hello Tomi, Laurent,
maybe it would be good to pick:
drm/rcar-du: dsi: Clean up VCLK divider calculation
that was posted about a month ago and fixes this exact warning ?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
2026-01-23 10:15 ` Marek Vasut
@ 2026-01-23 15:52 ` Laurent Pinchart
0 siblings, 0 replies; 3+ messages in thread
From: Laurent Pinchart @ 2026-01-23 15:52 UTC (permalink / raw)
To: Marek Vasut
Cc: kernel test robot, Tomi Valkeinen, oe-kbuild-all, linux-kernel,
Tomi Valkeinen
On Fri, Jan 23, 2026 at 11:15:35AM +0100, Marek Vasut wrote:
> On 1/23/26 1:58 AM, kernel test robot wrote:
> > Hi Marek,
> >
> > FYI, the error/warning still remains.
> >
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: a66191c590b3b58eaff05d2277971f854772bd5b
> > commit: 4f716a1db661cfb31502a0a6d7e62c06daf2e603 drm/rcar-du: dsi: Convert register bitfields to GENMASK() macro
> > date: 3 months ago
> > config: arc-randconfig-r053-20260123 (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/config)
> > compiler: arc-linux-gcc (GCC) 8.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260123/202601230809.FBjF6OrH-lkp@intel.com/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@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202601230809.FBjF6OrH-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>):
> >
> > In file included from <command-line>:
> > drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c: In function 'rcar_mipi_dsi_startup.isra.6':
> >>> include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field
> > _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> > ^
> > include/linux/compiler_types.h:578:4: note: in definition of macro '__compiletime_assert'
> > prefix ## suffix(); \
> > ^~~~~~
> > include/linux/compiler_types.h:597:2: note: in expansion of macro '_compiletime_assert'
> > _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> > ^~~~~~~~~~~~~~~~~~~
> > include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
> > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> > ^~~~~~~~~~~~~~~~~~
> > include/linux/bitfield.h:68:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
> > BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \
> > ^~~~~~~~~~~~~~~~
> > include/linux/bitfield.h:115:3: note: in expansion of macro '__BF_FIELD_CHECK'
> > __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
> > ^~~~~~~~~~~~~~~~
> > drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h:259:29: note: in expansion of macro 'FIELD_PREP'
> > #define VCLKSET_DIV_V4H(n) FIELD_PREP(VCLKSET_DIV_V4H_MASK, (n))
> > ^~~~~~~~~~
> > drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c:660:14: note: in expansion of macro 'VCLKSET_DIV_V4H'
> > vclkset |= VCLKSET_DIV_V4H(__ffs(setup_info.vclk_divider) - 1);
> > ^~~~~~~~~~~~~~~
>
> Hello Tomi, Laurent,
>
> maybe it would be good to pick:
>
> drm/rcar-du: dsi: Clean up VCLK divider calculation
>
> that was posted about a month ago and fixes this exact warning ?
About half a month actually. I've reviewed the patch (thanks for the
ping) and asked Tomi to push it.
--
Regards,
Laurent Pinchart
^ permalink raw reply [flat|nested] 3+ messages in thread
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2026-01-23 0:58 include/linux/compiler_types.h:597:38: error: call to '__compiletime_assert_495' declared with attribute error: FIELD_PREP: value too large for the field kernel test robot
2026-01-23 10:15 ` Marek Vasut
2026-01-23 15:52 ` Laurent Pinchart
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