powerpc/mm: Warn on flushing tlb page in kernel context
Function __flush_tlb_page() must only be called for user contexts, so put in extra hardening to warn on calling it for kernel context. Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -284,7 +284,11 @@ void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
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struct cpumask *cpu_mask;
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unsigned int pid;
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if (unlikely(!mm))
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/*
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* This function as well as __local_flush_tlb_page() must only be called
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* for user contexts.
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*/
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if (unlikely(WARN_ON(!mm)))
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return;
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preempt_disable();
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