| To: | Hollis Blanchard <hollisb@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Take a writer lock for mmap_sem. |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | 2007年7月09日 17:18:27 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-ppc-devel <xen-ppc-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | 2007年7月09日 09:16:28 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] Take a writer lock for mmap_sem. |
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On 9/7/07 16:45, "Hollis Blanchard" <hollisb@xxxxxxxxxx> wrote: > > My mistake, I meant to send this separately. > > In 2.6.17, we did our own locking inside direct_remap_pfn_range(). In > the current Linux tree though, the locking is done in privcmd_ioctl(). > > However, since direct_remap_pfn_range() is modifying the mm_struct, > shouldn't that be a a write lock rather than a read lock? Ah yes, agreed. All other callers seem to get this implicitly because they are ->mmap handlers. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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