Hello Kan Liang,
This is a semi-automatic email about new static checker warnings.
The patch deb27519bf1f: "perf/x86/intel: Fix LBR callstack issue
caused by FREEZE_LBRS_ON_PMI" from Aug 17, 2015, leads to the
following Smatch complaint:
arch/x86/kernel/cpu/perf_event_intel_lbr.c:155 __intel_pmu_lbr_enable()
warn: variable dereferenced before check 'cpuc->lbr_sel' (see line 154)
arch/x86/kernel/cpu/perf_event_intel_lbr.c
153 */
154 lbr_select = cpuc->lbr_sel->config;
^^^^^^^^^^^^^^^^^^^^^
New unchecked dereference.
155 if (cpuc->lbr_sel && !pmi)
^^^^^^^^^^^^^
Old code assumes it can be NULL.
156 wrmsrl(MSR_LBR_SELECT, lbr_select);
157
regards,
dan carpenter
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