[PATCH 12/12] amd-iommu: don't free dma adresses below 512MB with CONFIG_IOMMU_STRESS

[Joerg Roedel]

[ impact: stress test automatic aperture enlargement code ]

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 arch/x86/kernel/amd_iommu.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 33434c4..04ff5ec 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -824,6 +824,11 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
 
 	BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
 
+#ifdef CONFIG_IOMMU_STRESS
+	if (i < 4)
+		return;
+#endif
+
 	if (address >= dom->next_address)
 		dom->need_flush = true;
 
-- 
1.6.3.1


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