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 <[email protected]> --- arch/powerpc/mm/tlb_nohash.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c index f38ea4d..cbd3d06 100644 --- a/arch/powerpc/mm/tlb_nohash.c +++ b/arch/powerpc/mm/tlb_nohash.c @@ -284,8 +284,15 @@ void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr, struct cpumask *cpu_mask; unsigned int pid; + /* + * This function as well as __local_flush_tlb_page() must only be called + * for user contexts. + */ + if (unlikely(WARN_ON(!mm))) + return; + preempt_disable(); - pid = mm ? mm->context.id : 0; + pid = mm->context.id; if (unlikely(pid == MMU_NO_CONTEXT)) goto bail; cpu_mask = mm_cpumask(mm); -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
