On Tue, 05 Jan 2016, Bueso wrote:
On Tue, 05 Jan 2016, Peter Zijlstra wrote:
On Tue, Jan 05, 2016 at 12:23:55PM -0800, Davidlohr Bueso wrote:
+ if (unlikely(!mapping)) {
+ int shmem_swizzled;
+
+ /*
+ * Page lock is required to identify which special case above
+ * applies. If this is really a shmem page then the page lock
+ * will prevent unexpected transitions.
+ */
+ lock_page(page);
+ shmem_swizzled = PageSwapCache(page);
unlock_page(page);
put_page(page);
+ WARN_ON_ONCE(mapping);
We've not re-loaded mapping, so how could this possibly be?
Yep, this wants to be page->mapping.
Actually under compound_head() afaict, along with the rest of the page->mapping
loads.
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