[PATCH 28/31] Add debugger entry points for MN10300

[PATCH 28/31] Add debugger entry points for MN10300

[Jeffrey Merkey]

This patch series adds an export which can be set by system debuggers to
direct the hard lockup and soft lockup detector to trigger a breakpoint
exception and enter a debugger if one is active.  It is assumed that if
someone sets this variable, then an breakpoint handler of some sort will
be actively loaded or registered via the notify die handler chain.

This addition is extremely useful for debugging hard and soft lockups
real time and quickly from a console debugger.

Signed-off-by: Jeffrey Merkey <jeffmerkey@gmail.com>
---
 arch/mn10300/include/asm/kdebug.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/mn10300/include/asm/kdebug.h b/arch/mn10300/include/asm/kdebug.h
index 0f47e11..307b8a1 100644
--- a/arch/mn10300/include/asm/kdebug.h
+++ b/arch/mn10300/include/asm/kdebug.h
@@ -19,4 +19,11 @@ enum die_val {
 	DIE_GPF,
 };
 
+static inline void arch_breakpoint(void)
+{
+	asm(".globl __arch_breakpoint; __arch_breakpoint: break");
+}
+extern u8 __arch_breakpoint;
+
+
 #endif /* _ASM_KDEBUG_H */
-- 
1.8.3.1

Re: [PATCH 28/31] Add debugger entry points for MN10300

[kbuild test robot]

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Hi Jeffrey,

[auto build test ERROR on v4.5-rc1]
[also build test ERROR on next-20160128]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Jeffrey-Merkey/Add-hard-soft-lockup-debugger-entry-points/20160129-035852
config: mn10300-asb2364_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mn10300 

All errors (new ones prefixed by >>):

   In file included from include/linux/kdebug.h:4:0,
                    from kernel/notifier.c:1:
>> arch/mn10300/include/asm/kdebug.h:26:8: error: unknown type name 'u8'
    extern u8 __arch_breakpoint;
           ^

vim +/u8 +26 arch/mn10300/include/asm/kdebug.h

    20	};
    21	
    22	static inline void arch_breakpoint(void)
    23	{
    24		asm(".globl __arch_breakpoint; __arch_breakpoint: break");
    25	}
  > 26	extern u8 __arch_breakpoint;
    27	
    28	
    29	#endif /* _ASM_KDEBUG_H */

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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