First of all, I think this little slice of code is a bit under-documented. Perhaps this will help clarify things.
I'm pretty confident the page_count() check in the first patch is right, which is why I removed it outright. The xas_load() check is a bit murkier, so I just left a warning in for it. Cc: Nicholas Piggin <npig...@gmail.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Matthew Wilcox (Oracle) <wi...@infradead.org> Cc: Yang Shi <yang....@linux.alibaba.com> Cc: linux...@kvack.org Cc: linux-kernel@vger.kernel.org
