linux-kernel - new objtool warnings with gcc-14

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Message-Id: <ea203f8e-8dd4-46f6-ada5-a2bf5ea8185e@app.fastmail.com>
Date: Wed, 07 Aug 2024 15:56:45 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Josh Poimboeuf" <jpoimboe@...nel.org>,
 "Peter Zijlstra" <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: new objtool warnings with gcc-14

I see some objtool warnings with gcc-14.2.0 that I don't show
up on gcc-14.1 or older:

vmlinux.o: warning: objtool: adis16260_write_raw() falls through to next function adxrs290_read_avail()
vmlinux.o: warning: objtool: adis16400_write_raw() falls through to next function adis16400_show_flash_count()
vmlinux.o: warning: objtool: x86_init_dev_msi_info+0x61: relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: rza1_irqc_probe+0x257: relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: .export_symbol+0x5908: data relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: .export_symbol+0x35b18: data relocation to !ENDBR: stpcpy+0x0
vmlinux.o: warning: objtool: hv_pci_msi_controller+0x58: data relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: stm32mp_exti_chip_direct+0x58: data relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: meson_gpio_irq_chip+0x58: data relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: mst_intc_chip+0x58: data relocation to !ENDBR: irq_chip_retrigger_hierarchy+0x0
vmlinux.o: warning: objtool: mchp_eic_chip+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

See attached .config for a test case and 
https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/14.2.0/x86_64-gcc-14.2.0-nolibc-x86_64-linux.tar.xz
for the toolchain I'm using if you don't have gcc-14.2
otherwise. There are more warnings like these in other configurations,
but I assume they all need the same workaround.

     Arnd
Download attachment ".config" of type "application/octet-stream" (192851 bytes)