Re: [Xen-devel] gnttab: don't use domain lock for serialization

[tupeng212 <tupeng212@xxxxxxxxx>]

xen/common/grant_table.c

174 static inline void 

175 double_gt_lock(struct grant_table *lgt, struct grant_table *rgt) 

176 { 

177 if ( lgt < rgt ) 

178 { 

179 spin_lock(&lgt->lock); 

180 spin_lock(&rgt->lock); 

181 } 

182 else 

183 { 

184 if ( lgt != rgt ) 

185     spin_lock(&rgt->lock); 

186 spin_lock(&lgt->lock); //here if the same, we just lock once.

187 } 

188 }

 

I have a question, when lgt == rgt ?

remote domain's grant_table is created by itself, so how they get the same?

Thanks a lot!

 

---

tupeng212

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