30 lines
1.1 KiB
Diff
30 lines
1.1 KiB
Diff
From e2ca4d092d9c6e6b07b465b4d81da207bbcc7437 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 21:37:27 +0100
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Subject: [PATCH 3/6] arm/highmem: flush tlb on unmap
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.14/patches-3.14.0-rt1.tar.xz
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The tlb should be flushed on unmap and thus make the mapping entry
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invalid. This is only done in the non-debug case which does not look
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right.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/arm/mm/highmem.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/arm/mm/highmem.c
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+++ b/arch/arm/mm/highmem.c
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@@ -95,10 +95,10 @@ void __kunmap_atomic(void *kvaddr)
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__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
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#ifdef CONFIG_DEBUG_HIGHMEM
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BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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- set_top_pte(vaddr, __pte(0));
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#else
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(void) idx; /* to kill a warning */
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#endif
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+ set_top_pte(vaddr, __pte(0));
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kmap_atomic_idx_pop();
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} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
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/* this address was obtained through kmap_high_get() */
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