From: kernel test robot <lkp@intel.com>
To: Pingfan Liu <piliu@redhat.com>, linux-arm-kernel@lists.infradead.org
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
Pingfan Liu <piliu@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jeremy Linton <jeremy.linton@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
Simon Horman <horms@kernel.org>,
Gerd Hoffmann <kraxel@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Philipp Rudo <prudo@redhat.com>, Viktor Malik <vmalik@redhat.com>,
Jan Hendrik Farr <kernel@jfarr.cc>, Baoquan He <bhe@redhat.com>,
Dave Young <dyoung@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
kexec@lists.infradead.org, bpf@vger.kernel.org,
systemd-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHv6 11/13] arm64/kexec: Select KEXEC_BPF to support UEFI-style kernel image
Date: Mon, 19 Jan 2026 16:23:31 +0800 [thread overview]
Message-ID: <202601191626.CUD61tIS-lkp@intel.com> (raw)
In-Reply-To: <20260119032424.10781-12-piliu@redhat.com>
Hi Pingfan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf-next/net]
[also build test WARNING on bpf-next/master bpf/master akpm-mm/mm-nonmm-unstable linus/master v6.19-rc6 next-20260116]
[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/Pingfan-Liu/bpf-Introduce-kfuncs-to-parser-buffer-content/20260119-112939
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git net
patch link: https://lore.kernel.org/r/20260119032424.10781-12-piliu%40redhat.com
patch subject: [PATCHv6 11/13] arm64/kexec: Select KEXEC_BPF to support UEFI-style kernel image
config: arm64-randconfig-004-20260119 (https://download.01.org/0day-ci/archive/20260119/202601191626.CUD61tIS-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/20260119/202601191626.CUD61tIS-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/202601191626.CUD61tIS-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/kexec_bpf_loader.c:103:22: warning: unknown attribute 'optimize' ignored [-Wunknown-attributes]
103 | __attribute__((used, optimize("O0"))) void kexec_image_parser_anchor(
| ^~~~~~~~~~~~~~
1 warning generated.
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for KEXEC_BPF
Depends on [n]: KEXEC_FILE [=y] && DEBUG_INFO_BTF [=y] && BPF_SYSCALL [=y] && KEEP_DECOMPRESSOR [=n]
Selected by [y]:
- ARCH_SELECTS_KEXEC_FILE [=y] && KEXEC_FILE [=y] && DEBUG_INFO_BTF [=y] && BPF_SYSCALL [=y]
vim +/optimize +103 kernel/kexec_bpf_loader.c
e683ae405ea0458 Pingfan Liu 2026-01-19 93
e683ae405ea0458 Pingfan Liu 2026-01-19 94 void kexec_image_parser_anchor(struct kexec_context *context,
e683ae405ea0458 Pingfan Liu 2026-01-19 95 unsigned long parser_id);
e683ae405ea0458 Pingfan Liu 2026-01-19 96
e683ae405ea0458 Pingfan Liu 2026-01-19 97 /*
e683ae405ea0458 Pingfan Liu 2026-01-19 98 * optimize("O0") prevents inline, compiler constant propagation
e683ae405ea0458 Pingfan Liu 2026-01-19 99 *
e683ae405ea0458 Pingfan Liu 2026-01-19 100 * Let bpf be the program context pointer so that it will not be spilled into
e683ae405ea0458 Pingfan Liu 2026-01-19 101 * stack.
e683ae405ea0458 Pingfan Liu 2026-01-19 102 */
e683ae405ea0458 Pingfan Liu 2026-01-19 @103 __attribute__((used, optimize("O0"))) void kexec_image_parser_anchor(
e683ae405ea0458 Pingfan Liu 2026-01-19 104 struct kexec_context *context,
e683ae405ea0458 Pingfan Liu 2026-01-19 105 unsigned long parser_id)
e683ae405ea0458 Pingfan Liu 2026-01-19 106 {
e683ae405ea0458 Pingfan Liu 2026-01-19 107 /*
e683ae405ea0458 Pingfan Liu 2026-01-19 108 * To prevent linker from Identical Code Folding (ICF) with kexec_image_parser_anchor,
e683ae405ea0458 Pingfan Liu 2026-01-19 109 * making them have different code.
e683ae405ea0458 Pingfan Liu 2026-01-19 110 */
e683ae405ea0458 Pingfan Liu 2026-01-19 111 volatile int dummy = 0;
e683ae405ea0458 Pingfan Liu 2026-01-19 112
e683ae405ea0458 Pingfan Liu 2026-01-19 113 dummy += 1;
e683ae405ea0458 Pingfan Liu 2026-01-19 114 }
e683ae405ea0458 Pingfan Liu 2026-01-19 115
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
parent reply other threads:[~2026-01-19 8:24 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20260119032424.10781-12-piliu@redhat.com>]
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