------- Comment From [email protected] 2017-08-30 04:53 EDT-------
The upstream version of __tlb_flush_mm has this:
static inline void __tlb_flush_mm(struct mm_struct *mm)
{
...
/* Reset TLB flush mask */
cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
...
}
The difference is because of git commit 64f31d5802af11fd
"s390/mm: simplify the TLB flushing code" which removed the
check for MACHINE_HAS_TLB_LC and simply always does the
copy.
Imho the patch is correct.
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https://bugs.launchpad.net/bugs/1708399
Title:
kernel panic -not syncing: Fatal exception: panic_on_oops
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