[ash:perf-aux-sampling 5/20] arch/x86/events/intel/pt.c:495:2: note: in expansion of macro 'if'

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ash/linux.git perf-aux-sampling
head:   b08efd75924e19b3590a7fb607e266ad372dfa06
commit: d1f97c3e2169ac8cb52e8f57716b3e21d524536d [5/20] perf/x86/intel/pt: Opportunistically use single range output mode
config: x86_64-randconfig-a001-201942 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-14) 7.4.0
reproduce:
        git checkout d1f97c3e2169ac8cb52e8f57716b3e21d524536d
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:5:0,
                    from arch/x86/include/asm/bug.h:83,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:15,
                    from arch/x86/events/intel/pt.c:16:
   arch/x86/events/intel/pt.c: In function 'pt_config':
   arch/x86/events/intel/pt.c:495:7: error: 'buf' undeclared (first use in this function); did you mean 'btf'?
     if (!buf->single)
          ^
   include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                       ^~~~
>> arch/x86/events/intel/pt.c:495:2: note: in expansion of macro 'if'
     if (!buf->single)
     ^~
   arch/x86/events/intel/pt.c:495:7: note: each undeclared identifier is reported only once for each function it appears in
     if (!buf->single)
          ^
   include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                       ^~~~
>> arch/x86/events/intel/pt.c:495:2: note: in expansion of macro 'if'
     if (!buf->single)
     ^~

vim +/if +495 arch/x86/events/intel/pt.c

   482	
   483	static void pt_config(struct perf_event *event)
   484	{
   485		u64 reg;
   486	
   487		/* First round: clear STATUS, in particular the PSB byte counter. */
   488		if (!event->hw.config) {
   489			perf_event_itrace_started(event);
   490			wrmsrl(MSR_IA32_RTIT_STATUS, 0);
   491		}
   492	
   493		reg = pt_config_filters(event);
   494		reg |= RTIT_CTL_TRACEEN;
 > 495		if (!buf->single)
   496			reg |= RTIT_CTL_TOPA;
   497	
   498		/*
   499		 * Previously, we had BRANCH_EN on by default, but now that PT has
   500		 * grown features outside of branch tracing, it is useful to allow
   501		 * the user to disable it. Setting bit 0 in the event's attr.config
   502		 * allows BRANCH_EN to pass through instead of being always on. See
   503		 * also the comment in pt_event_valid().
   504		 */
   505		if (event->attr.config & BIT(0)) {
   506			reg |= event->attr.config & RTIT_CTL_BRANCH_EN;
   507		} else {
   508			reg |= RTIT_CTL_BRANCH_EN;
   509		}
   510	
   511		if (!event->attr.exclude_kernel)
   512			reg |= RTIT_CTL_OS;
   513		if (!event->attr.exclude_user)
   514			reg |= RTIT_CTL_USR;
   515	
   516		reg |= (event->attr.config & PT_CONFIG_MASK);
   517	
   518		event->hw.config = reg;
   519		pt_config_start(event);
   520	}
   521	

---
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