[Xen-devel] [PATCH 2/2] x86/SVM-IOMMU: Drop get_field_from_byte()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

It is MASK_EXTR() in disguise, but less flexible.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
CC: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
CC: Brian Woods <brian.woods@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_map.c       | 2 +-
 xen/include/asm-x86/hvm/svm/amd-iommu-proto.h | 5 -----
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_map.c 
b/xen/drivers/passthrough/amd/iommu_map.c
index 70b4345..ded2cc7 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -220,7 +220,7 @@ void __init iommu_dte_add_device_entry(u32 *dte, struct 
ivrs_mappings *ivrs_dev)
     dte[7] = dte[6] = dte[4] = dte[2] = dte[1] = dte[0] = 0;
 
     flags = ivrs_dev->device_flags;
-    sys_mgt = get_field_from_byte(flags, ACPI_IVHD_SYSTEM_MGMT);
+    sys_mgt = MASK_EXTR(flags, ACPI_IVHD_SYSTEM_MGMT);
     dev_ex = ivrs_dev->dte_allow_exclusion;
 
     flags &= mask;
diff --git a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h 
b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
index 99bc21c..1b965e1 100644
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -155,11 +155,6 @@ static inline u32 set_field_in_reg_u32(u32 field, u32 
reg_value,
     return reg_value;
 }
 
-static inline u8 get_field_from_byte(u8 value, u8 mask)
-{
-    return (value & mask) / (mask & -mask);
-}
-
 static inline unsigned long region_to_pages(unsigned long addr, unsigned long 
size)
 {
     return (PAGE_ALIGN(addr + size) - (addr & PAGE_MASK)) >> PAGE_SHIFT;
-- 
2.1.4


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