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x86, AMD IOMMU: remove unneeded initializations from command buffer allocation

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This patch removes an unneeded initialization from the alloc_command_buffer
function and replaces a memset with __GFP_ZERO.

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 17:14:29 +02:00 committed by Ingo Molnar
parent d64495366f
commit d0312b2142
1 changed files with 2 additions and 4 deletions
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6
arch/x86/kernel/amd_iommu_init.c
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@ -394,17 +394,15 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table)
*/
static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
{
u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL,
u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(CMD_BUFFER_SIZE));
u64 entry = 0;
u64 entry;
if (cmd_buf == NULL)
return NULL;
iommu->cmd_buf_size = CMD_BUFFER_SIZE;
memset(cmd_buf, 0, CMD_BUFFER_SIZE);
entry = (u64)virt_to_phys(cmd_buf);
entry |= MMIO_CMD_SIZE_512;
memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,