tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/stackguards
head:   f06282dacdf39de480ede989a689743402e1110c
commit: 2e2333a2ed97c5df6bac64f689a1d4695e8e9ec9 [19/29] x86/exceptions: Split debug IST stack
config: x86_64-randconfig-x002-201913 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 2e2333a2ed97c5df6bac64f689a1d4695e8e9ec9
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from include/asm-generic/percpu.h:7:0,
                    from arch/x86/include/asm/percpu.h:544,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from arch/x86/kernel/nmi.c:13:
   arch/x86/kernel/nmi.c: In function 'is_debug_stack':
   arch/x86/kernel/nmi.c:493:52: error: 'cea_exception_stacks' undeclared (first use in this function)
     struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
                                                       ^
   include/linux/percpu-defs.h:318:9: note: in definition of macro '__pcpu_size_call_return'
     typeof(variable) pscr_ret__;     \
            ^~~~~~~~
   include/linux/percpu-defs.h:446:2: note: in expansion of macro 'raw_cpu_read'
     raw_cpu_read(pcp);      \
     ^~~~~~~~~~~~
   arch/x86/kernel/nmi.c:493:36: note: in expansion of macro '__this_cpu_read'
     struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
                                       ^~~~~~~~~~~~~~~
   arch/x86/kernel/nmi.c:493:52: note: each undeclared identifier is reported only once for each function it appears in
     struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
                                                       ^
   include/linux/percpu-defs.h:318:9: note: in definition of macro '__pcpu_size_call_return'
     typeof(variable) pscr_ret__;     \
            ^~~~~~~~
   include/linux/percpu-defs.h:446:2: note: in expansion of macro 'raw_cpu_read'
     raw_cpu_read(pcp);      \
     ^~~~~~~~~~~~
   arch/x86/kernel/nmi.c:493:36: note: in expansion of macro '__this_cpu_read'
     struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
                                       ^~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:444:1: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
    ({         \
    ^
   arch/x86/kernel/nmi.c:493:36: note: in expansion of macro '__this_cpu_read'
     struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
                                       ^~~~~~~~~~~~~~~
   arch/x86/kernel/nmi.c:494:22: error: implicit declaration of function 'CEA_ESTACK_TOP'; did you mean 'STACK_TOP'? [-Werror=implicit-function-declaration]
     unsigned long top = CEA_ESTACK_TOP(cs, DB);
                         ^~~~~~~~~~~~~~
                         STACK_TOP
   arch/x86/kernel/nmi.c:494:41: error: 'DB' undeclared (first use in this function)
     unsigned long top = CEA_ESTACK_TOP(cs, DB);
                                            ^~
>> arch/x86/kernel/nmi.c:495:22: error: implicit declaration of function 'CEA_ESTACK_BOT'; did you mean 'CUR_STACK_SIZE'? [-Werror=implicit-function-declaration]
     unsigned long bot = CEA_ESTACK_BOT(cs, DB1);
                         ^~~~~~~~~~~~~~
                         CUR_STACK_SIZE
   arch/x86/kernel/nmi.c:495:41: error: 'DB1' undeclared (first use in this function); did you mean 'DB'?
     unsigned long bot = CEA_ESTACK_BOT(cs, DB1);
                                            ^~~
                                            DB
   cc1: some warnings being treated as errors

vim +495 arch/x86/kernel/nmi.c

   490	
   491	static bool notrace is_debug_stack(unsigned long addr)
   492	{
   493		struct cea_exception_stacks *cs = __this_cpu_read(cea_exception_stacks);
 > 494		unsigned long top = CEA_ESTACK_TOP(cs, DB);
 > 495		unsigned long bot = CEA_ESTACK_BOT(cs, DB1);
   496	
   497		if (__this_cpu_read(debug_stack_usage))
   498			return true;
   499		/*
   500		 * Note, this covers the guard page between DB and DB1 as well to
   501		 * avoid two checks. But by all means @addr can never point into
   502		 * the guard page.
   503		 */
   504		return addr > bot && addr < top;
   505	}
   506	NOKPROBE_SYMBOL(is_debug_stack);
   507	#endif
   508	

---
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