linux-kernel - linux: master: x86_64: gcc-8: error: call to '__compiletime_assert_909' declared with attribute error: clamp() low limit dsc_min_bpc * 3 greater than high limit dsc_max

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Message-ID: <CA+G9fYtNfM399_=_ff81zeRJv=0+z7oFJfPGmJgTp6yrJmU+1w@mail.gmail.com>
Date: Thu, 30 Jan 2025 15:01:21 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: lkft-triage@...ts.linaro.org, open list <linux-kernel@...r.kernel.org>, 
	Linux Regressions <regressions@...ts.linux.dev>, 
	Linux ARM <linux-arm-kernel@...ts.infradead.org>
Cc: David Laight <david.laight@...lab.com>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>
Subject: linux: master: x86_64: gcc-8: error: call to '__compiletime_assert_909'
 declared with attribute error: clamp() low limit dsc_min_bpc * 3 greater than
 high limit dsc_max_bpc * 3

The x86_64 and i386 build failed with defconfig with gcc-8 toolchain due to
following build warnings / errors on the Torvalds Linux master branch.
But gcc-13 builds pass.

First seen on v6.13-9485-g72deda0abee6 on Jan. 27, 2025
Good:  v6.13-7644-gc2da8b3f914f on Jan. 27, 2025
Bad:  v6.13-8265-g9c5968db9e62 on Jan. 27, 2025

i386:
  build:
    * gcc-8-i386_defconfig

x86_64:
  build:
    * gcc-8-x86_64_defconfig

Reported-by: Linux Kernel Functional Testing

Build log:
---
make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/build ARCH=x86_64 SRCARCH=x86
CROSS_COMPILE=x86_64-linux-gnu- 'CC=sccache x86_64-linux-gnu-gcc'
'HOSTCC=sccache gcc'
In file included from <command-line>:
In function 'intel_dp_dsc_compute_pipe_bpp_limits.isra.80',
    inlined from 'intel_dp_compute_config_limits' at
drivers/gpu/drm/i915/display/intel_dp.c:2547:3:
include/linux/compiler_types.h:542:38: error: call to
'__compiletime_assert_909' declared with attribute error: clamp() low
limit dsc_min_bpc * 3 greater than high limit dsc_max_bpc * 3
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^
include/linux/compiler_types.h:523:4: note: in definition of macro
'__compiletime_assert'
    prefix ## suffix();    \
    ^~~~~~
include/linux/compiler_types.h:542:2: 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/minmax.h:188:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
  BUILD_BUG_ON_MSG(statically_true(ulo > uhi),    \
  ^~~~~~~~~~~~~~~~
include/linux/minmax.h:195:2: note: in expansion of macro '__clamp_once'
  __clamp_once(type, val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_),
__UNIQUE_ID(h_))
  ^~~~~~~~~~~~
include/linux/minmax.h:206:28: note: in expansion of macro '__careful_clamp'
 #define clamp(val, lo, hi) __careful_clamp(__auto_type, val, lo, hi)
                            ^~~~~~~~~~~~~~~
drivers/gpu/drm/i915/display/intel_dp.c:2506:25: note: in expansion of
macro 'clamp'
  limits->pipe.max_bpp = clamp(limits->pipe.max_bpp, dsc_min_bpc * 3,
dsc_max_bpc * 3);
                         ^~~~~
make[7]: *** [scripts/Makefile.build:194:
drivers/gpu/drm/i915/display/intel_dp.o] Error 1


Links:
---
 build log: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.13-9485-g72deda0abee6/testrun/27066663/suite/build/test/gcc-8-x86_64_defconfig/log
 details: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.13-9485-g72deda0abee6/testrun/27066663/suite/build/test/gcc-8-x86_64_defconfig/details/
 history: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.13-9485-g72deda0abee6/testrun/27066663/suite/build/test/gcc-8-x86_64_defconfig/history/

Steps to reproduce:
------------
$ tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-8
--kconfig x86_64_defconfig

metadata:
---
  git describe: v6.13-9485-g72deda0abee6
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  git sha: 72deda0abee6e705ae71a93f69f55e33be5bca5c
  kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2sKEcVft7ytiSSvOSnAuAxlCgRH/config
  build url: https://storage.tuxsuite.com/public/linaro/lkft/builds/2sKEcVft7ytiSSvOSnAuAxlCgRH/
  toolchain: gcc8
  config: gcc-8-defconfig
  arch: i386 and x86_64

--
Linaro LKFT
https://lkft.linaro.org