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x86, AMD IOMMU: replace memset with __GFP_ZERO for table allocation

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This patch removes the memset from the data structure initialization code and
allocate the structures with the __GFP_ZERO flag.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: robert.richter@amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-07-11 17:14:32 +02:00 committed by Ingo Molnar
parent 2e22847fbe
commit 5dc8bff0f6
1 changed files with 5 additions and 9 deletions
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14
arch/x86/kernel/amd_iommu_init.c
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@ -890,7 +890,7 @@ int __init amd_iommu_init(void)
ret = -ENOMEM;
/* Device table - directly used by all IOMMUs */
amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL,
amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(dev_table_size));
if (amd_iommu_dev_table == NULL)
goto out;
@ -914,27 +914,23 @@ int __init amd_iommu_init(void)
* Protection Domain table - maps devices to protection domains
* This table has the same size as the rlookup_table
*/
amd_iommu_pd_table = (void *)__get_free_pages(GFP_KERNEL,
amd_iommu_pd_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(rlookup_table_size));
if (amd_iommu_pd_table == NULL)
goto free;
amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(GFP_KERNEL,
amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
GFP_KERNEL | __GFP_ZERO,
get_order(MAX_DOMAIN_ID/8));
if (amd_iommu_pd_alloc_bitmap == NULL)
goto free;
/*
* memory is allocated now; initialize the device table with all zeroes
* and let all alias entries point to itself
* let all alias entries point to itself
*/
memset(amd_iommu_dev_table, 0, dev_table_size);
for (i = 0; i < amd_iommu_last_bdf; ++i)
amd_iommu_alias_table[i] = i;
memset(amd_iommu_pd_table, 0, rlookup_table_size);
memset(amd_iommu_pd_alloc_bitmap, 0, MAX_DOMAIN_ID / 8);
/*
* never allocate domain 0 because its used as the non-allocated and
* error value placeholder