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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Sat, Mar 21, 2020 at 09:43:17AM +0100, Christoph Hellwig wrote: > On Fri, Mar 20, 2020 at 01:49:04PM -0300, Jason Gunthorpe wrote: > > From: Jason Gunthorpe > > > > This code can be compiled when CONFIG_TRANSPARENT_HUGEPAGE is off, so > > remove the ifdef. > > It can compile, but will the compiler optimize it away? Yes, the enclosing conditional: if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) { is statically false if !CONFIG_TRANSPARENT_HUGEPAGE This is proven today, as the fallback stub is a function prototype with no implementation: -int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr, - unsigned long end, uint64_t *pfns, pmd_t pmd); If the compiler wasn't optimizing the above branch we'd get link failures. Jason _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel