24 lines
783 B
Diff
24 lines
783 B
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Mon, 11 Mar 2013 17:09:55 +0100
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Subject: x86/highmem: Add a "already used pte" check
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.1-rt3.tar.xz
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This is a copy from kmap_atomic_prot().
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/x86/mm/iomap_32.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/arch/x86/mm/iomap_32.c
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+++ b/arch/x86/mm/iomap_32.c
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@@ -69,6 +69,8 @@ void *kmap_atomic_prot_pfn(unsigned long
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type = kmap_atomic_idx_push();
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idx = type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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+ WARN_ON(!pte_none(*(kmap_pte - idx)));
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+
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#ifdef CONFIG_PREEMPT_RT_FULL
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current->kmap_pte[type] = pte;
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#endif
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