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Thu, 24 Jul 2025 11:37:33 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: T64ccb58220bb6c4f Date: Thu, 24 Jul 2025 17:37:11 +0200 From: "Arnd Bergmann" To: "Mark Rutland" Cc: "Jeff Johnson" , linux-kernel@vger.kernel.org, "Peter Zijlstra" , "Josh Poimboeuf" Message-Id: In-Reply-To: References: <8362b484-ea77-4825-8ccb-d5acad660102@oss.qualcomm.com> <617201f8-1ad7-4403-b195-8c80d35ea30f@app.fastmail.com> Subject: Re: build failure with crosstools gcc 15.1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit On Thu, Jul 24, 2025, at 12:44, Mark Rutland wrote: > On Fri, Jul 04, 2025 at 03:25:49PM +0200, Arnd Bergmann wrote: >> On Mon, Jun 23, 2025, at 21:52, Jeff Johnson wrote: >> > vmlinux.o: warning: objtool: ncsi_process_next_channel() falls through >> > to next function ncsi_channel_monitor.cold() >> > vmlinux.o: error: objtool [elf.c:1360]: elf_write: elf_update failed: >> >> Sorry for the late reply, have you figured it out in the meantime? >> >> I couldn't immediately reproduce it, so it may already be fixed >> in linux-next. > > $ git clean -fdx > $ usekorg 15.1.0 make ARCH=x86_64 CROSS_COMPILE=x86_64-linux- defconfig > $ usekorg 15.1.0 make ARCH=x86_64 CROSS_COMPILE=x86_64-linux- -j56 This is very close to what I use. I assume you are also on an arm64 host here? > Doing the same with the 14.2.0 binaries, e.g. > > $ git clean -fdx > $ usekorg 14.2.0 make ARCH=x86_64 CROSS_COMPILE=x86_64-linux- defconfig > $ usekorg 14.2.0 make ARCH=x86_64 CROSS_COMPILE=x86_64-linux- -j56 > > ... builds successfully, but there are some objtool warnings: > > | LD vmlinux.o > | vmlinux.o: warning: objtool: x86_init_dev_msi_info+0x58: relocation > to !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: .export_symbol+0x3e78: data relocation > to !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: .export_symbol+0x31140: data relocation > to !ENDBR: stpcpy+0x0 > | vmlinux.o: warning: objtool: dmar_msi_controller+0x58: data > relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: intcapxt_controller+0x58: data > relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: hpet_msi_controller+0x58: data > relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: ioapic_ir_chip+0x58: data relocation to > !ENDBR: irq_chip_retrigger_hierarchy+0x0 > | vmlinux.o: warning: objtool: ioapic_chip+0x58: data relocation to > !ENDBR: irq_chip_retrigger_hierarchy+0x0 My build output is empty with either of those toolchains. However I've seen a couple of other warnings on randconfig builds recently, all of these are with gcc-15.1: drivers/gpu/drm/msm/msm.o: warning: objtool: submit_lock_objects+0x10c: sibling call from callable instruction with modified stack frame drivers/gpu/drm/msm/msm_gem_submit.o: warning: objtool: submit_lock_objects+0x147: sibling call from callable instruction with modified stack frame drivers/media/cec/core/cec-adap.o: warning: objtool: cec_receive_notify.isra.0+0x6c5: ignoring unreachables due to jump table quirk kernel/trace/rv/reactor_panic.o: warning: objtool: rv_panic_reaction(): unexpected end of section .text.unlikely vmlinux.o: warning: objtool: hdmi_display_enable+0x145: hdmi_pll_compute() missing __noreturn in .c/.h or NORETURN() in noreturns.h Arnd