linux-kernel - Re: [PATCH 2/4] kbuild: Disable AutoFDO and Propeller flags for kernel modules

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Message-ID: <CAF1bQ=T3hMROdSqGOZ7W_=iThtJHEoxNF+sfdAnGS2npecgRyw@mail.gmail.com>
Date: Tue, 14 Oct 2025 12:02:19 -0700
From: Rong Xu <xur@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: Alexey Gladkov <legion@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Ard Biesheuvel <ardb@...nel.org>, Bill Wendling <morbo@...gle.com>, Han Shen <shenhan@...gle.com>, 
	Ingo Molnar <mingo@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Masahiro Yamada <masahiroy@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Nicolas Schier <nicolas.schier@...ux.dev>, 
	Peter Zijlstra <peterz@...radead.org>, Tamir Duberstein <tamird@...il.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
	Yabin Cui <yabinc@...gle.com>, Sriraman Tallam <tmsriram@...gle.com>, oe-kbuild-all@...ts.linux.dev, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev
Subject: Re: [PATCH 2/4] kbuild: Disable AutoFDO and Propeller flags for
 kernel modules

These new warnings are legit. We now pass LDFLAGS_vmlinux to the
linker with the orphan-handling option set to the appropriate warning
level. These warnings are similar to other existing warnings in the
buildlog and they are legit.

-Rong


On Sat, Oct 11, 2025 at 7:13 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on kees/for-next/kspp]
> [also build test WARNING on linus/master v6.17 next-20251010]
> [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/xur-google-com/kbuild-Disable-AutoFDO-and-Propeller-flags-for-kernel-modules/20251011-050345
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
> patch link:    https://lore.kernel.org/r/20251010210134.2066321-2-xur%40google.com
> patch subject: [PATCH 2/4] kbuild: Disable AutoFDO and Propeller flags for kernel modules
> :::::: branch date: 26 hours ago
> :::::: commit date: 26 hours ago
> config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20251012/202510120641.H3SMaB6Q-lkp@intel.com/config)
> compiler: powerpc-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251012/202510120641.H3SMaB6Q-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@...el.com>
> | Closes: https://lore.kernel.org/r/202510120641.H3SMaB6Q-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> powerpc-linux-ld: warning: orphan section `.head.text' from `arch/powerpc/kernel/head_book3s_32.o' being placed in section `.head.text'
> >> powerpc-linux-ld: warning: orphan section `__ftr_alt_97' from `arch/powerpc/kernel/head_book3s_32.o' being placed in section `__ftr_alt_97'
> >> powerpc-linux-ld: warning: orphan section `__mmu_ftr_fixup' from `arch/powerpc/kernel/head_book3s_32.o' being placed in section `__mmu_ftr_fixup'
> >> powerpc-linux-ld: warning: orphan section `__ftr_fixup' from `arch/powerpc/kernel/head_book3s_32.o' being placed in section `__ftr_fixup'
> >> powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/fpu.o' being placed in section `.export_symbol'
> >> powerpc-linux-ld: warning: orphan section `.export_symbol' from `init/main.o' being placed in section `.export_symbol'
> >> powerpc-linux-ld: warning: orphan section `.init.text' from `init/main.o' being placed in section `.init.text'
> >> powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `init/main.o' being placed in section `.rodata.str1.4'
> >> powerpc-linux-ld: warning: orphan section `__bug_table' from `init/main.o' being placed in section `__bug_table'
> >> powerpc-linux-ld: warning: orphan section `.ref.text' from `init/main.o' being placed in section `.ref.text'
> >> powerpc-linux-ld: warning: orphan section `.text.unlikely' from `init/main.o' being placed in section `.text.unlikely'
> >> powerpc-linux-ld: warning: orphan section `.data..read_mostly' from `init/main.o' being placed in section `.data..read_mostly'
> >> powerpc-linux-ld: warning: orphan section `.data..ro_after_init' from `init/main.o' being placed in section `.data..ro_after_init'
> >> powerpc-linux-ld: warning: orphan section `.discard.addressable' from `init/main.o' being placed in section `.discard.addressable'
> >> powerpc-linux-ld: warning: orphan section `.init.data' from `init/main.o' being placed in section `.init.data'
> >> powerpc-linux-ld: warning: orphan section `.init.rodata' from `init/main.o' being placed in section `.init.rodata'
> >> powerpc-linux-ld: warning: orphan section `.init.setup' from `init/main.o' being placed in section `.init.setup'
> >> powerpc-linux-ld: warning: orphan section `__param' from `init/main.o' being placed in section `__param'
> >> powerpc-linux-ld: warning: orphan section `.export_symbol' from `init/version.o' being placed in section `.export_symbol'
> >> powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `init/version.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `init/version.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `init/version.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.rodata' from `init/version.o' being placed in section `.init.rodata'
>    powerpc-linux-ld: warning: orphan section `.init.setup' from `init/version.o' being placed in section `.init.setup'
>    powerpc-linux-ld: warning: orphan section `.note.Linux' from `init/version.o' being placed in section `.note.Linux'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `init/do_mounts.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `init/do_mounts.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.text.unlikely' from `init/do_mounts.o' being placed in section `.text.unlikely'
>    powerpc-linux-ld: warning: orphan section `.init.data' from `init/do_mounts.o' being placed in section `.init.data'
>    powerpc-linux-ld: warning: orphan section `.init.rodata' from `init/do_mounts.o' being placed in section `.init.rodata'
>    powerpc-linux-ld: warning: orphan section `.init.setup' from `init/do_mounts.o' being placed in section `.init.setup'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `init/noinitramfs.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `init/noinitramfs.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.initcallrootfs.init' from `init/noinitramfs.o' being placed in section `.initcallrootfs.init'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `init/init_task.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `init/init_task.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/cputable.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/cputable.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/cputable.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/cputable.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.data..ro_after_init' from `arch/powerpc/kernel/cputable.o' being placed in section `.data..ro_after_init'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/cputable.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.data' from `arch/powerpc/kernel/cputable.o' being placed in section `.init.data'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/irq.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/irq.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/irq.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/irq.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.data..read_mostly' from `arch/powerpc/kernel/irq.o' being placed in section `.data..read_mostly'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/irq.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.static_call_sites' from `arch/powerpc/kernel/irq.o' being placed in section `.static_call_sites'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/align.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__ex_table' from `arch/powerpc/kernel/align.o' being placed in section `__ex_table'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/align.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `__ex_table' from `arch/powerpc/kernel/signal_32.o' being placed in section `__ex_table'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/signal_32.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/pmc.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/pmc.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/pmc.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/pmc.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/vdso.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/vdso.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/vdso.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.data..ro_after_init' from `arch/powerpc/kernel/vdso.o' being placed in section `.data..ro_after_init'
>    powerpc-linux-ld: warning: orphan section `.initcall3.init' from `arch/powerpc/kernel/vdso.o' being placed in section `.initcall3.init'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/process.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/process.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/process.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.text.unlikely' from `arch/powerpc/kernel/process.o' being placed in section `.text.unlikely'
>    powerpc-linux-ld: warning: orphan section `__ftr_alt_97' from `arch/powerpc/kernel/process.o' being placed in section `__ftr_alt_97'
>    powerpc-linux-ld: warning: orphan section `__ftr_fixup' from `arch/powerpc/kernel/process.o' being placed in section `__ftr_fixup'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/process.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `__ex_table' from `arch/powerpc/kernel/process.o' being placed in section `__ex_table'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/process.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.rodata' from `arch/powerpc/kernel/process.o' being placed in section `.init.rodata'
>    powerpc-linux-ld: warning: orphan section `.init.setup' from `arch/powerpc/kernel/process.o' being placed in section `.init.setup'
>    powerpc-linux-ld: warning: orphan section `.initcallearly.init' from `arch/powerpc/kernel/process.o' being placed in section `.initcallearly.init'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/idle.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/idle.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/idle.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/idle.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.rodata' from `arch/powerpc/kernel/idle.o' being placed in section `.init.rodata'
>    powerpc-linux-ld: warning: orphan section `.init.setup' from `arch/powerpc/kernel/idle.o' being placed in section `.init.setup'
>    powerpc-linux-ld: warning: orphan section `.initcall6.init' from `arch/powerpc/kernel/idle.o' being placed in section `.initcall6.init'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/signal.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/signal.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/sysfs.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/sysfs.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/sysfs.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/sysfs.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/sysfs.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.initcall4.init' from `arch/powerpc/kernel/sysfs.o' being placed in section `.initcall4.init'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/cacheinfo.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/cacheinfo.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.data..once' from `arch/powerpc/kernel/cacheinfo.o' being placed in section `.data..once'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/time.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/time.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/time.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.data..once' from `arch/powerpc/kernel/time.o' being placed in section `.data..once'
>    powerpc-linux-ld: warning: orphan section `.data..read_mostly' from `arch/powerpc/kernel/time.o' being placed in section `.data..read_mostly'
>    powerpc-linux-ld: warning: orphan section `.data..ro_after_init' from `arch/powerpc/kernel/time.o' being placed in section `.data..ro_after_init'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/time.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/prom.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/prom.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/prom.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/prom.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/prom.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.data' from `arch/powerpc/kernel/prom.o' being placed in section `.init.data'
>    powerpc-linux-ld: warning: orphan section `.init.rodata' from `arch/powerpc/kernel/prom.o' being placed in section `.init.rodata'
>    powerpc-linux-ld: warning: orphan section `.init.setup' from `arch/powerpc/kernel/prom.o' being placed in section `.init.setup'
>    powerpc-linux-ld: warning: orphan section `__ex_table' from `arch/powerpc/kernel/traps.o' being placed in section `__ex_table'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/traps.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `__bug_table' from `arch/powerpc/kernel/traps.o' being placed in section `__bug_table'
>    powerpc-linux-ld: warning: orphan section `.noinstr.text' from `arch/powerpc/kernel/traps.o' being placed in section `.noinstr.text'
>    powerpc-linux-ld: warning: orphan section `.text.unlikely' from `arch/powerpc/kernel/traps.o' being placed in section `.text.unlikely'
>    powerpc-linux-ld: warning: orphan section `.export_symbol' from `arch/powerpc/kernel/setup-common.o' being placed in section `.export_symbol'
>    powerpc-linux-ld: warning: orphan section `.rodata.str1.4' from `arch/powerpc/kernel/setup-common.o' being placed in section `.rodata.str1.4'
>    powerpc-linux-ld: warning: orphan section `.text.unlikely' from `arch/powerpc/kernel/setup-common.o' being placed in section `.text.unlikely'
>    powerpc-linux-ld: warning: orphan section `.init.text' from `arch/powerpc/kernel/setup-common.o' being placed in section `.init.text'
>    powerpc-linux-ld: warning: orphan section `.discard.addressable' from `arch/powerpc/kernel/setup-common.o' being placed in section `.discard.addressable'
>    powerpc-linux-ld: warning: orphan section `.init.data' from `arch/powerpc/kernel/setup-common.o' being placed in section `.init.data'
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>