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SubjectRe: [PATCH -tip] [BUGFIX] kprobes/x86: Do not jump-optimize kprobes on irq entry code
Hi Masami,

[auto build test ERROR on tip/x86/core]
[also build test ERROR on v4.13-rc2 next-20170724]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/kprobes-x86-Do-not-jump-optimize-kprobes-on-irq-entry-code/20170725-121438
config: i386-randconfig-x019-201730 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

arch/x86/kernel/unwind_frame.c: In function 'in_entry_code':
>> arch/x86/kernel/unwind_frame.c:95:14: error: '__irqentry_text_start' undeclared (first use in this function)
if (addr >= __irqentry_text_start && addr < __irqentry_text_end)
^~~~~~~~~~~~~~~~~~~~~
arch/x86/kernel/unwind_frame.c:95:14: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/kernel/unwind_frame.c:95:46: error: '__irqentry_text_end' undeclared (first use in this function)
if (addr >= __irqentry_text_start && addr < __irqentry_text_end)
^~~~~~~~~~~~~~~~~~~

vim +/__irqentry_text_start +95 arch/x86/kernel/unwind_frame.c

24d86f59 Josh Poimboeuf 2016-10-27 86
6b4d2348 Masami Hiramatsu 2017-07-24 87 bool in_entry_code(unsigned long ip)
a8b7a923 Josh Poimboeuf 2017-04-12 88 {
a8b7a923 Josh Poimboeuf 2017-04-12 89 char *addr = (char *)ip;
a8b7a923 Josh Poimboeuf 2017-04-12 90
a8b7a923 Josh Poimboeuf 2017-04-12 91 if (addr >= __entry_text_start && addr < __entry_text_end)
a8b7a923 Josh Poimboeuf 2017-04-12 92 return true;
a8b7a923 Josh Poimboeuf 2017-04-12 93
6b4d2348 Masami Hiramatsu 2017-07-24 94 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) || defined(CONFIG_KPROBES)
a8b7a923 Josh Poimboeuf 2017-04-12 @95 if (addr >= __irqentry_text_start && addr < __irqentry_text_end)
a8b7a923 Josh Poimboeuf 2017-04-12 96 return true;
a8b7a923 Josh Poimboeuf 2017-04-12 97 #endif
a8b7a923 Josh Poimboeuf 2017-04-12 98
a8b7a923 Josh Poimboeuf 2017-04-12 99 return false;
a8b7a923 Josh Poimboeuf 2017-04-12 100 }
a8b7a923 Josh Poimboeuf 2017-04-12 101

:::::: The code at line 95 was first introduced by commit
:::::: a8b7a92318b6d7779f6d8e9aa6ba0e3de01a8943 x86/unwind: Silence entry-related warnings

:::::: TO: Josh Poimboeuf <jpoimboe@redhat.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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