linux-kernel - [tip:WIP.x86/apic 37/46] arch/x86/kernel/traps.c:892:1: error: 'xo' undeclared

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Date:   Sat, 26 Aug 2017 22:55:22 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.x86/apic 37/46] arch/x86/kernel/traps.c:892:1: error: 'xo'
 undeclared

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/apic
head:   6acaab8814cf6c7f77c1ee2e1ed266509573d5b4
commit: 8f1d566bc1f0f6e055a46728bfd906dd74a3f74c [37/46] x86/idt: Switch early trap init to IDT tables
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 8f1d566bc1f0f6e055a46728bfd906dd74a3f74c
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   arch/x86/kernel/traps.c: In function 'do_device_not_available':
>> arch/x86/kernel/traps.c:892:1: error: 'xo' undeclared (first use in this function)
    xo if (WARN(cr0 & X86_CR0_TS, "CR0.TS was set")) {
    ^~
   arch/x86/kernel/traps.c:892:1: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/kernel/traps.c:892:4: error: expected ';' before 'if'
    xo if (WARN(cr0 & X86_CR0_TS, "CR0.TS was set")) {
       ^~
   arch/x86/kernel/traps.c: At top level:
>> arch/x86/kernel/traps.c:926:1: warning: data definition has no type or storage class
    xovoid __init trap_init(void)
    ^~~~~~
>> arch/x86/kernel/traps.c:926:1: error: type defaults to 'int' in declaration of 'xovoid' [-Werror=implicit-int]
>> arch/x86/kernel/traps.c:926:1: warning: '__cold__' attribute ignored [-Wattributes]
>> arch/x86/kernel/traps.c:926:15: error: expected ',' or ';' before 'trap_init'
    xovoid __init trap_init(void)
                  ^~~~~~~~~
   cc1: some warnings being treated as errors

vim +/xo +892 arch/x86/kernel/traps.c

   889	
   890		/* This should not happen. */
   891		cr0 = read_cr0();
 > 892	xo	if (WARN(cr0 & X86_CR0_TS, "CR0.TS was set")) {
   893			/* Try to fix it up and carry on. */
   894			write_cr0(cr0 & ~X86_CR0_TS);
   895		} else {
   896			/*
   897			 * Something terrible happened, and we're better off trying
   898			 * to kill the task than getting stuck in a never-ending
   899			 * loop of #NM faults.
   900			 */
   901			die("unexpected #NM exception", regs, error_code);
   902		}
   903	}
   904	NOKPROBE_SYMBOL(do_device_not_available);
   905	
   906	#ifdef CONFIG_X86_32
   907	dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
   908	{
   909		siginfo_t info;
   910	
   911		RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
   912		local_irq_enable();
   913	
   914		info.si_signo = SIGILL;
   915		info.si_errno = 0;
   916		info.si_code = ILL_BADSTK;
   917		info.si_addr = NULL;
   918		if (notify_die(DIE_TRAP, "iret exception", regs, error_code,
   919				X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) {
   920			do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code,
   921				&info);
   922		}
   923	}
   924	#endif
   925	
 > 926	xovoid __init trap_init(void)
   927	{
   928		int i;
   929	
   930		set_intr_gate(X86_TRAP_DE, divide_error);
   931		set_intr_gate_ist(X86_TRAP_NMI, &nmi, NMI_STACK);
   932		/* int4 can be called from all */
   933		set_system_intr_gate(X86_TRAP_OF, &overflow);
   934		set_intr_gate(X86_TRAP_BR, bounds);
   935		set_intr_gate(X86_TRAP_UD, invalid_op);
   936		set_intr_gate(X86_TRAP_NM, device_not_available);
   937	#ifdef CONFIG_X86_32
   938		set_task_gate(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS);
   939	#else
   940		set_intr_gate_ist(X86_TRAP_DF, &double_fault, DOUBLEFAULT_STACK);
   941	#endif
   942		set_intr_gate(X86_TRAP_OLD_MF, coprocessor_segment_overrun);
   943		set_intr_gate(X86_TRAP_TS, invalid_TSS);
   944		set_intr_gate(X86_TRAP_NP, segment_not_present);
   945		set_intr_gate(X86_TRAP_SS, stack_segment);
   946		set_intr_gate(X86_TRAP_GP, general_protection);
   947		set_intr_gate(X86_TRAP_SPURIOUS, spurious_interrupt_bug);
   948		set_intr_gate(X86_TRAP_MF, coprocessor_error);
   949		set_intr_gate(X86_TRAP_AC, alignment_check);
   950	#ifdef CONFIG_X86_MCE
   951		set_intr_gate_ist(X86_TRAP_MC, &machine_check, MCE_STACK);
   952	#endif
   953		set_intr_gate(X86_TRAP_XF, simd_coprocessor_error);
   954	
   955		/* Reserve all the builtin and the syscall vector: */
   956		for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
   957			set_bit(i, used_vectors);
   958	

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