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From: FUJITA Tomonori on 9 May 2010 23:40
'protect4gb' boot parameter was introduced to avoid allocating dma
space acrossing 4GB boundary in 2007 (the commit
569975591c5530fdc9c7a3c45122e5e46f075a74).

In 2008, the IOMMU was fixed to use the boundary_mask parameter per
device properly. So 'protect4gb' workaround was removed (the
383af9525bb27f927511874f6306247ec13f1c28). But somehow I messed the
'protect4gb' boot parameter that was used to enable the
workaround.

Signed-off-by: FUJITA Tomonori <fujita.tomonori(a)lab.ntt.co.jp>
---
arch/powerpc/kernel/iommu.c | 12 ------------
1 files changed, 0 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index ec94f90..d583917 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -43,20 +43,9 @@
#define DBG(...)

static int novmerge;
-static int protect4gb = 1;

static void __iommu_free(struct iommu_table *, dma_addr_t, unsigned int);

-static int __init setup_protect4gb(char *str)
-{
- if (strcmp(str, "on") == 0)
- protect4gb = 1;
- else if (strcmp(str, "off") == 0)
- protect4gb = 0;
-
- return 1;
-}
-
static int __init setup_iommu(char *str)
{
if (!strcmp(str, "novmerge"))
@@ -66,7 +55,6 @@ static int __init setup_iommu(char *str)
return 1;
}

-__setup("protect4gb=", setup_protect4gb);
__setup("iommu=", setup_iommu);

static unsigned long iommu_range_alloc(struct device *dev,
--
1.6.5

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