linux-kernel - [tip:perf/urgent 4/5] arch/x86//events/amd/core.c:542:9: error: 'NMI_HANDLED' undeclared; did you mean 'IRQ

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Date:   Wed, 3 Apr 2019 22:47:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Lendacky, Thomas" <Thomas.Lendacky@....com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Ingo Molnar <mingo@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [tip:perf/urgent 4/5] arch/x86//events/amd/core.c:542:9: error:
 'NMI_HANDLED' undeclared; did you mean 'IRQ_HANDLED'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/urgent
head:   60f52ab61c7dc0a991125903ae06a35d1812698c
commit: 6d3edaae16c6c7d238360f2841212c2b26774d5e [4/5] x86/perf/amd: Resolve NMI latency issues for active PMCs
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 6d3edaae16c6c7d238360f2841212c2b26774d5e
        # save the attached .config to linux build tree
        make ARCH=i386 

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

   arch/x86//events/amd/core.c: In function 'amd_pmu_handle_irq':
   arch/x86//events/amd/core.c:538:10: error: 'NMI_DONE' undeclared (first use in this function); did you mean 'EM_NONE'?
      return NMI_DONE;
             ^~~~~~~~
             EM_NONE
   arch/x86//events/amd/core.c:538:10: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86//events/amd/core.c:542:9: error: 'NMI_HANDLED' undeclared (first use in this function); did you mean 'IRQ_HANDLED'?
     return NMI_HANDLED;
            ^~~~~~~~~~~
            IRQ_HANDLED
>> arch/x86//events/amd/core.c:543:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +542 arch/x86//events/amd/core.c

   493	
   494	/*
   495	 * Because of NMI latency, if multiple PMC counters are active or other sources
   496	 * of NMIs are received, the perf NMI handler can handle one or more overflowed
   497	 * PMC counters outside of the NMI associated with the PMC overflow. If the NMI
   498	 * doesn't arrive at the LAPIC in time to become a pending NMI, then the kernel
   499	 * back-to-back NMI support won't be active. This PMC handler needs to take into
   500	 * account that this can occur, otherwise this could result in unknown NMI
   501	 * messages being issued. Examples of this is PMC overflow while in the NMI
   502	 * handler when multiple PMCs are active or PMC overflow while handling some
   503	 * other source of an NMI.
   504	 *
   505	 * Attempt to mitigate this by using the number of active PMCs to determine
   506	 * whether to return NMI_HANDLED if the perf NMI handler did not handle/reset
   507	 * any PMCs. The per-CPU perf_nmi_counter variable is set to a minimum of the
   508	 * number of active PMCs or 2. The value of 2 is used in case an NMI does not
   509	 * arrive at the LAPIC in time to be collapsed into an already pending NMI.
   510	 */
   511	static int amd_pmu_handle_irq(struct pt_regs *regs)
   512	{
   513		struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
   514		int active, handled;
   515	
   516		/*
   517		 * Obtain the active count before calling x86_pmu_handle_irq() since
   518		 * it is possible that x86_pmu_handle_irq() may make a counter
   519		 * inactive (through x86_pmu_stop).
   520		 */
   521		active = __bitmap_weight(cpuc->active_mask, X86_PMC_IDX_MAX);
   522	
   523		/* Process any counter overflows */
   524		handled = x86_pmu_handle_irq(regs);
   525	
   526		/*
   527		 * If a counter was handled, record the number of possible remaining
   528		 * NMIs that can occur.
   529		 */
   530		if (handled) {
   531			this_cpu_write(perf_nmi_counter,
   532				       min_t(unsigned int, 2, active));
   533	
   534			return handled;
   535		}
   536	
   537		if (!this_cpu_read(perf_nmi_counter))
 > 538			return NMI_DONE;
   539	
   540		this_cpu_dec(perf_nmi_counter);
   541	
 > 542		return NMI_HANDLED;
 > 543	}
   544	

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