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SubjectRe: [PATCH v12 3/7] kasan: Add report for async mode
Hi Vincenzo,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20210125]
[cannot apply to arm64/for-next/core xlnx/master arm/for-next soc/for-next kvmarm/next linus/master hnaz-linux-mm/master v5.11-rc6 v5.11-rc5 v5.11-rc4 v5.11-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in]

base: 59fa6a163ffabc1bf25c5e0e33899e268a96d3cc
config: x86_64-randconfig-s021-20210209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
# apt-get install sparse
# sparse version: v0.6.3-215-g0fb77bb6-dirty
git remote add linux-review
git fetch --no-tags linux-review Vincenzo-Frascino/arm64-ARMv8-5-A-MTE-Add-async-mode-support/20210209-080907
git checkout 93bd347e4877e3616f7db64f488ebb469718dd68
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

ld: mm/kasan/report.o: in function `end_report':
>> mm/kasan/report.c:90: undefined reference to `kasan_flag_async'
>> ld: mm/kasan/report.c:90: undefined reference to `kasan_flag_async'

vim +90 mm/kasan/report.c

88 static void end_report(unsigned long *flags, unsigned long addr)
89 {
> 90 if (!kasan_flag_async)
91 trace_error_report_end(ERROR_DETECTOR_KASAN, addr);
92 pr_err("==================================================================\n");
94 spin_unlock_irqrestore(&report_lock, *flags);
95 if (panic_on_warn && !test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags)) {
96 /*
97 * This thread may hit another WARN() in the panic path.
98 * Resetting this prevents additional WARN() from panicking the
99 * system on this thread. Other threads are blocked by the
100 * panic_mutex in panic().
101 */
102 panic_on_warn = 0;
103 panic("panic_on_warn set ...\n");
104 }
106 if (kasan_flag_panic)
107 panic("kasan.fault=panic set ...\n");
108 #endif
109 kasan_enable_current();
110 }

0-DAY CI Kernel Test Service, Intel Corporation
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