From a3e5089d38487019199ed908d9720d9ce24deef3 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 11 Mar 2013 17:09:55 +0100 Subject: [PATCH 262/365] x86/highmem: Add a "already used pte" check This is a copy from kmap_atomic_prot(). Signed-off-by: Sebastian Andrzej Siewior --- arch/x86/mm/iomap_32.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c index 2620fb55ece1..585f6829653b 100644 --- a/arch/x86/mm/iomap_32.c +++ b/arch/x86/mm/iomap_32.c @@ -66,6 +66,8 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + WARN_ON(!pte_none(*(kmap_pte - idx))); + #ifdef CONFIG_PREEMPT_RT_FULL current->kmap_pte[type] = pte; #endif -- 2.28.0