x86, AMD IOMMU: replace self made size parsing with memparse call

This patch replaces the self-made parsing of the amd_iommu_size option with the
generic memparse function call.

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>

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 2efc3d59b7e60cd9aa3b1767f70e29e0028528e4..e0ff9404e6c94bd7e4fbd24f41bbd2ae65db1168 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1042,20 +1042,10 @@ static int __init parse_amd_iommu_options(char *str)
 
 static int __init parse_amd_iommu_size_options(char *str)
 {
-       for (; *str; ++str) {
-               if (strcmp(str, "32M") == 0)
-                       amd_iommu_aperture_order = 25;
-               if (strcmp(str, "64M") == 0)
-                       amd_iommu_aperture_order = 26;
-               if (strcmp(str, "128M") == 0)
-                       amd_iommu_aperture_order = 27;
-               if (strcmp(str, "256M") == 0)
-                       amd_iommu_aperture_order = 28;
-               if (strcmp(str, "512M") == 0)
-                       amd_iommu_aperture_order = 29;
-               if (strcmp(str, "1G") == 0)
-                       amd_iommu_aperture_order = 30;
-       }
+       unsigned order = PAGE_SHIFT + get_order(memparse(str, &str));
+
+       if ((order > 24) && (order < 31))
+               amd_iommu_aperture_order = order;
 
        return 1;
 }