linux-hardening - Re: [PATCH v2 3/3] randomize_kstack: Unify random source across arches

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Message-ID: <581a0fac-7891-4644-af65-0354e22b9311@arm.com>
Date: Fri, 2 Jan 2026 12:58:32 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: kernel test robot <lkp@...el.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Huacai Chen <chenhuacai@...nel.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Paul Walmsley <pjw@...nel.org>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Arnd Bergmann <arnd@...db.de>, Mark Rutland <mark.rutland@....com>,
 "Jason A. Donenfeld" <Jason@...c4.com>, Ard Biesheuvel <ardb@...nel.org>,
 Jeremy Linton <jeremy.linton@....com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 3/3] randomize_kstack: Unify random source across
 arches

On 16/12/2025 16:31, kernel test robot wrote:
> Hi Ryan,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on tip/sched/core]
> [also build test ERROR on akpm-mm/mm-everything linus/master v6.19-rc1 next-20251216]
> [cannot apply to kees/for-next/hardening kees/for-next/execve]
> [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/Ryan-Roberts/prandom-Convert-prandom_u32_state-to-__always_inline/20251216-013546
> base:   tip/sched/core
> patch link:    https://lore.kernel.org/r/20251215163520.1144179-4-ryan.roberts%40arm.com
> patch subject: [PATCH v2 3/3] randomize_kstack: Unify random source across arches
> config: x86_64-rhel-9.4-ltp (https://download.01.org/0day-ci/archive/20251217/202512170038.vJZdUhEN-lkp@intel.com/config)
> compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251217/202512170038.vJZdUhEN-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/oe-kbuild-all/202512170038.vJZdUhEN-lkp@intel.com/
> 
> All error/warnings (new ones prefixed by >>):
> 
>>> arch/x86/boot/startup/sev-startup.o: warning: objtool: section .discard.addressable has absolute relocation at offset 0x0
> --
>    In file included from include/linux/device/driver.h:21,
>                     from include/linux/device.h:32,
>                     from include/linux/blk_types.h:11,
>                     from include/linux/writeback.h:13,
>                     from include/linux/memcontrol.h:23,
>                     from include/linux/resume_user_mode.h:8,
>                     from include/linux/entry-virt.h:6,
>                     from include/linux/kvm_host.h:5,
>                     from arch/x86/kvm/svm/svm.c:3:
>>> include/linux/module.h:132:49: error: redefinition of '__inittest'
>      132 |         static inline initcall_t __maybe_unused __inittest(void)                \
>          |                                                 ^~~~~~~~~~
>    arch/x86/kvm/svm/svm.c:5509:1: note: in expansion of macro 'module_init'
>     5509 | module_init(svm_init)
>          | ^~~~~~~~~~~
>    include/linux/module.h:132:49: note: previous definition of '__inittest' with type 'int (*(void))(void)'
>      132 |         static inline initcall_t __maybe_unused __inittest(void)                \
>          |                                                 ^~~~~~~~~~
>    include/linux/module.h:125:41: note: in expansion of macro 'module_init'
>      125 | #define late_initcall(fn)               module_init(fn)
>          |                                         ^~~~~~~~~~~
>    include/linux/randomize_kstack.h:86:1: note: in expansion of macro 'late_initcall'
>       86 | late_initcall(random_kstack_init);
>          | ^~~~~~~~~~~~~

Oops, this is due to having put late_initcall() in the header file. I'll move
this to a c file for the next version.

Thanks for the report!