Commit c2c896be authored Feb 04, 2015 by Arseny Solokha Committed by Michael Ellerman Feb 04, 2015

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>

parent 7f43e71e

arch/powerpc/mm/tlb_nohash.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -284,7 +284,11 @@ void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
		struct cpumask *cpu_mask;
		unsigned int pid;

		if (unlikely(!mm))
		/*
		* This function as well as __local_flush_tlb_page() must only be called
		* for user contexts.
		*/
		if (unlikely(WARN_ON(!mm)))
		return;

		preempt_disable();