The following powerpc ppc6xx_defconfig build regressions noticed on the Linux next-20251027 tag with gcc-14 and gcc-8.
* powerpc, build - gcc-14-ppc6xx_defconfig - gcc-8-ppc6xx_defconfig
First seen on next-20251027 Good: next-20251024 Bad: next-20251027
Regression Analysis: - New regression? yes - Reproducibility? yes
Build regression: next-20251027: backlight.c:59:39: error: implicit declaration of function 'of_find_node_by_name'; did you mean 'bus_find_device_by_name'? Build regression: next-20251027: include/linux/math.h:167:43: error: first argument to '__builtin_choose_expr' not a constant Build regression: next-20251027: via-pmu-backlight.c:22:20: error: 'FB_BACKLIGHT_LEVELS' undeclared here (not in a function) Build regression: next-20251027: minmax.h:71:17: error: first argument to '__builtin_choose_expr' not a constant Build regression: next-20251027: compiler.h:168:17: error: '__UNIQUE_ID_x__286' undeclared (first use in this function); did you mean '__UNIQUE_ID_y__287'?
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Build error arch/powerpc/platforms/powermac/backlight.c: In function 'pmac_has_backlight_type': arch/powerpc/platforms/powermac/backlight.c:59:39: error: implicit declaration of function 'of_find_node_by_name'; did you mean 'bus_find_device_by_name'? [-Wimplicit-function-declaration] 59 | struct device_node* bk_node = of_find_node_by_name(NULL, "backlight"); | ^~~~~~~~~~~~~~~~~~~~ | bus_find_device_by_name arch/powerpc/platforms/powermac/backlight.c:59:39: error: initialization of 'struct device_node *' from 'int' makes pointer from integer without a cast [-Wint-conversion] arch/powerpc/platforms/powermac/backlight.c:60:17: error: implicit declaration of function 'of_property_match_string' [-Wimplicit-function-declaration] 60 | int i = of_property_match_string(bk_node, "backlight-control", type); | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/platforms/powermac/backlight.c:62:9: error: implicit declaration of function 'of_node_put' [-Wimplicit-function-declaration] 62 | of_node_put(bk_node); | ^~~~~~~~~~~ drivers/macintosh/via-pmu-backlight.c:22:20: error: 'FB_BACKLIGHT_LEVELS' undeclared here (not in a function) 22 | static u8 bl_curve[FB_BACKLIGHT_LEVELS]; | ^~~~~~~~~~~~~~~~~~~ In file included from <command-line>: drivers/macintosh/via-pmu-backlight.c: In function 'pmu_backlight_curve_lookup': include/linux/compiler.h:168:17: error: '__UNIQUE_ID_x__286' undeclared (first use in this function); did you mean '__UNIQUE_ID_y__287'? 168 | __PASTE(__UNIQUE_ID_, \ | ^~~~~~~~~~~~ drivers/macintosh/via-pmu-backlight.c:45:23: note: in expansion of macro 'max' 45 | max = max((int)bl_curve[i], max); | ^~~ include/linux/minmax.h:71:17: error: first argument to '__builtin_choose_expr' not a constant 71 | (typeof(__builtin_choose_expr(sizeof(ux) > 4, 1LL, 1L)))(ux) >= 0) | ^~~~~~~~~~~~~~~~~~~~~ include/linux/compiler_types.h:577:23: note: in definition of macro '__compiletime_assert' 577 | if (!(condition)) \ | ^~~~~~~~~ drivers/macintosh/via-pmu-backlight.c:45:23: note: in expansion of macro 'max' 45 | max = max((int)bl_curve[i], max); | ^~~ include/linux/minmax.h:71:17: error: first argument to '__builtin_choose_expr' not a constant 71 | (typeof(__builtin_choose_expr(sizeof(ux) > 4, 1LL, 1L)))(ux) >= 0) | ^~~~~~~~~~~~~~~~~~~~~ include/linux/compiler_types.h:577:23: note: in definition of macro '__compiletime_assert' 577 | if (!(condition)) \ | ^~~~~~~~~ include/linux/minmax.h:112:25: note: in expansion of macro '__careful_cmp' 112 | #define max(x, y) __careful_cmp(max, x, y) | ^~~~~~~~~~~~~ drivers/macintosh/via-pmu-backlight.c:45:23: note: in expansion of macro 'max' 45 | max = max((int)bl_curve[i], max); | ^~~ In file included from include/linux/kernel.h:27, from arch/powerpc/include/asm/page.h:11, from arch/powerpc/include/asm/thread_info.h:13, from include/linux/thread_info.h:60, from arch/powerpc/include/asm/ptrace.h:342, from drivers/macintosh/via-pmu-backlight.c:11: include/linux/math.h:162:17: error: first argument to '__builtin_choose_expr' not a constant 162 | __builtin_choose_expr( \ | ^~~~~~~~~~~~~~~~~~~~~
drivers/macintosh/via-pmu-backlight.c: In function 'pmu_backlight_get_level_brightness': drivers/macintosh/via-pmu-backlight.c:63:38: error: 'FB_BACKLIGHT_MAX' undeclared (first use in this function); did you mean 'BACKLIGHT_RAW'? 63 | pmulevel = bl_curve[level] * FB_BACKLIGHT_MAX / MAX_PMU_LEVEL; | ^~~~~~~~~~~~~~~~ | BACKLIGHT_RAW drivers/macintosh/via-pmu-backlight.c:58:51: warning: parameter 'level' set but not used [-Wunused-but-set-parameter] 58 | static int pmu_backlight_get_level_brightness(int level) | ~~~~^~~~~ drivers/macintosh/via-pmu-backlight.c: In function 'pmu_backlight_init': drivers/macintosh/via-pmu-backlight.c:144:17: error: implicit declaration of function 'of_machine_is_compatible' [-Wimplicit-function-declaration] 144 | of_machine_is_compatible("AAPL,3400/2400") || | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/macintosh/via-pmu-backlight.c: At top level: drivers/macintosh/via-pmu-backlight.c:22:11: warning: 'bl_curve' defined but not used [-Wunused-variable] 22 | static u8 bl_curve[FB_BACKLIGHT_LEVELS]; | ^~~~~~~~ make[5]: *** [scripts/Makefile.build:287: drivers/macintosh/via-pmu-backlight.o] Error 1 make[5]: Target 'drivers/macintosh/' not remade because of errors.
## Source * Kernel version: 6.18.0-rc2-next-20251027 * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git describe: next-20251027 * Git commit: 8fec172c82c2b5f6f8e47ab837c1dc91ee3d1b87 * Architectures: powerpc * Toolchains: gcc-14 * Kconfigs: defconfig
## Build * Test log: https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrlb77LGOQQSoC8FHC... * Test details: https://regressions.linaro.org/lkft/linux-next-master/next-20251027/build/gc... * Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/34dKrlb77L... * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrlb77LGOQQSoC8FHC... * Kernel config: https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrlb77LGOQQSoC8FHC...
-- Linaro LKFT