linux-kernel - [tip:x86/asm 6/13] drivers/w1/w1_io.o: warning: objtool: w1_reset

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Message-ID: <201707242219.cqLbWr36%fengguang.wu@intel.com>
Date:   Mon, 24 Jul 2017 22:16:23 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Ingo Molnar <mingo@...nel.org>
Subject: [tip:x86/asm 6/13] drivers/w1/w1_io.o: warning: objtool:
 w1_reset_bus()+0x36: unreachable instruction

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/asm
head:   9683a64fc3cb67e663859a6bb2e0db5dcee9ed32
commit: 39358a033b2e4432052265c1fa0f36f572d8cfb5 [6/13] objtool, x86: Add facility for asm code to provide unwind hints
config: x86_64-randconfig-in0-07242041 (attached as .config)
compiler: gcc-4.6 (Debian 4.6.4-7) 4.6.4
reproduce:
        git checkout 39358a033b2e4432052265c1fa0f36f572d8cfb5
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> drivers/w1/w1_io.o: warning: objtool: w1_reset_bus()+0x36: unreachable instruction
--
>> drivers/parport/parport_ax88796.o: warning: objtool: parport_ax88796_disable_irq()+0x2a: unreachable instruction
--
>> drivers/tty/serial/serial_core.o: warning: objtool: uart_remove_one_port()+0x40: unreachable instruction
--
>> drivers/tty/serial/8250/8250_core.o: warning: objtool: serial_do_unlink()+0xc0: unreachable instruction
--
>> drivers/tty/serial/8250/8250_port.o: warning: objtool: serial8250_console_write()+0x62: unreachable instruction
--
>> drivers/pci/pci.o: warning: objtool: pci_choose_state()+0xa9: unreachable instruction
--
>> drivers/pci/setup-bus.o: warning: objtool: pci_assign_unassigned_bus_resources()+0xc1: unreachable instruction
--
>> init/main.o: warning: objtool: do_one_initcall()+0x13f: unreachable instruction
--
>> init/do_mounts.o: warning: objtool: mount_block_root()+0x350: unreachable instruction
--
>> arch/x86/entry/common.o: warning: objtool: syscall_trace_enter()+0x63: unreachable instruction
--
   arch/x86/events/core.c: In function 'init_hw_perf_events':
   arch/x86/events/core.c:261:3: warning: 'reg_fail' may be used uninitialized in this function [-Wuninitialized]
   arch/x86/events/core.c:195:14: note: 'reg_fail' was declared here
   arch/x86/events/core.c:261:3: warning: 'val_fail' may be used uninitialized in this function [-Wuninitialized]
   arch/x86/events/core.c:194:11: note: 'val_fail' was declared here
>> arch/x86/events/core.o: warning: objtool: refresh_pce()+0x79: unreachable instruction
..

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