From: David Laight <david.laight.linux@gmail•com>
To: kernel test robot <lkp@intel•com>
Cc: Ryan Roberts <ryan.roberts@arm•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Will Deacon <will@kernel•org>,
Huacai Chen <chenhuacai@kernel•org>,
Madhavan Srinivasan <maddy@linux•ibm.com>,
Michael Ellerman <mpe@ellerman•id.au>,
Paul Walmsley <pjw@kernel•org>,
Palmer Dabbelt <palmer@dabbelt•com>,
Albert Ou <aou@eecs•berkeley.edu>,
Heiko Carstens <hca@linux•ibm.com>,
Vasily Gorbik <gor@linux•ibm.com>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Thomas Gleixner <tglx@linutronix•de>,
Ingo Molnar <mingo@redhat•com>, Borislav Petkov <bp@alien8•de>,
Dave Hansen <dave.hansen@linux•intel.com>,
Kees Cook <kees@kernel•org>,
"Gustavo A. R. Silva" <gustavoars@kernel•org>,
Arnd Bergmann <arnd@arndb•de>,
Mark Rutland <mark.rutland@arm•com>,
"Jason A. Donenfeld" <Jason@zx2c4•com>,
Ard Biesheuvel <ardb@kernel•org>,
Jeremy Linton <jeremy.linton@arm•com>,
llvm@lists•linux.dev, oe-kbuild-all@lists•linux.dev,
linux-kernel@vger•kernel.org,
linux-arm-kernel@lists•infradead.org, loongarch@lists•linux.dev,
linuxppc-dev@lists•ozlabs.org, linux-riscv@lists•infradead.org,
linux-s390@vger•kernel.org
Subject: Re: [PATCH v4 3/3] randomize_kstack: Unify random source across arches
Date: Wed, 21 Jan 2026 10:20:17 +0000 [thread overview]
Message-ID: <20260121102017.539b5531@pumpkin> (raw)
In-Reply-To: <202601210752.6Nsv9et9-lkp@intel.com>
On Wed, 21 Jan 2026 07:50:16 +0800
kernel test robot <lkp@intel•com> wrote:
> Hi Ryan,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on akpm-mm/mm-everything]
> [also build test WARNING on linus/master v6.19-rc6 next-20260119]
> [cannot apply to tip/sched/core 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/randomize_kstack-Maintain-kstack_offset-per-task/20260119-210329
> base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link: https://lore.kernel.org/r/20260119130122.1283821-4-ryan.roberts%40arm.com
> patch subject: [PATCH v4 3/3] randomize_kstack: Unify random source across arches
> config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20260121/202601210752.6Nsv9et9-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260121/202601210752.6Nsv9et9-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/202601210752.6Nsv9et9-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> vmlinux.o: warning: objtool: do_syscall_64+0x2c: call to preempt_count_add() leaves .noinstr.text section
> >> vmlinux.o: warning: objtool: __do_fast_syscall_32+0x3d: call to preempt_count_add() leaves .noinstr.text section
>
When CONFIG_DEBUG_PREEMPT or CONFIG_TRACE_PREEMP_TOGGLE is set
the preempt_count_[en|dis]able() calls inside [put|get]_cpu_var()
become real functions.
Maybe __preempt_count_[inc|dec]() can be called (with this_cpu_ptr()).
David
next prev parent reply other threads:[~2026-01-21 12:07 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-19 13:01 [PATCH v4 0/3] Fix bugs and performance of kstack offset randomisation Ryan Roberts
2026-01-19 13:01 ` [PATCH v4 1/3] randomize_kstack: Maintain kstack_offset per task Ryan Roberts
2026-01-19 16:10 ` Dave Hansen
2026-01-19 16:51 ` Ryan Roberts
2026-01-19 16:53 ` Dave Hansen
2026-01-19 13:01 ` [PATCH v4 2/3] prandom: Add __always_inline version of prandom_u32_state() Ryan Roberts
2026-01-28 17:00 ` Jason A. Donenfeld
2026-01-28 17:33 ` Ryan Roberts
2026-01-28 18:32 ` David Laight
2026-01-30 16:16 ` Christophe Leroy (CS GROUP)
2026-01-19 13:01 ` [PATCH v4 3/3] randomize_kstack: Unify random source across arches Ryan Roberts
2026-01-20 23:50 ` kernel test robot
2026-01-21 10:20 ` David Laight [this message]
2026-01-21 14:48 ` David Laight
2026-01-21 10:52 ` Ryan Roberts
2026-01-21 12:32 ` Mark Rutland
2026-02-18 15:20 ` Ryan Roberts
2026-02-22 21:34 ` Thomas Gleixner
2026-02-23 9:41 ` David Laight
2026-03-03 14:43 ` Ryan Roberts
2026-01-19 16:00 ` [PATCH v4 0/3] Fix bugs and performance of kstack offset randomisation Dave Hansen
2026-01-19 16:44 ` Kees Cook
2026-01-19 16:51 ` Dave Hansen
2026-01-20 16:32 ` Ryan Roberts
2026-01-20 16:37 ` Dave Hansen
2026-01-20 16:45 ` Ryan Roberts
2026-01-20 18:45 ` David Laight
2026-01-19 16:25 ` Heiko Carstens
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