On Fri, 2013-05-24 at 08:22 +0800, Li, Zhen-Hua wrote:
> There is a structure named context_entry used by intel iommu, and there
> are some bit operations on it. Use bit structure may make these operations
> easy.
[]
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
[]
> @@ -221,55 +221,28 @@ get_context_addr_from_root(struct root_entry *root)
> * 8-23: domain id
> */
> struct context_entry {
> - u64 lo;
> - u64 hi;
> + union {
> + struct {
> + u64 present:1,
why use struct and union at all?
Why not just:
struct context_entry {
u64 present:1,
fpd:1,
translation_type:2,
reserved_l:8,
asr:52;
u64 aw:3,
avail:4,
reserved_h1:1,
did:16,
reserved_h2:40;
};
> @@ -743,7 +716,8 @@ static void clear_context_table(struct intel_iommu
> *iommu, u8 bus, u8 devfn)
[]
> if (context) {
> - context_clear_entry(&context[devfn]);
> + context[devfn].lo = 0;
> + context[devfn].hi = 0;
memset(&context[devfn], 0, sizeof(...))
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