30 lines
1002 B
Diff
30 lines
1002 B
Diff
From cd3614855e4c65eaa6be98bb350080ec58373cde Mon Sep 17 00:00:00 2001
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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: [PATCH 219/266] 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-4.19.31-rt18.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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diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
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index d5a48210d0f6..c0ec8d430c02 100644
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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 pfn, pgprot_t prot)
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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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--
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2.20.1
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