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[ Upstream commitceb7b62eaa] This reverts commit18d7de823b. We cannot use vmap_pfn() in vmap_udmabuf() as it would fail the pfn_valid() check in vmap_pfn_apply(). This is because vmap_pfn() is intended to be used for mapping non-struct-page memory such as PCIe BARs. Since, udmabuf mostly works with pages/folios backed by shmem/hugetlbfs/THP, vmap_pfn() is not the right tool or API to invoke for implementing vmap. Signed-off-by: Huan Yang <link@vivo.com> Suggested-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Reported-by: Bingbu Cao <bingbu.cao@linux.intel.com> Closes: https://lore.kernel.org/dri-devel/eb7e0137-3508-4287-98c4-816c5fd98e10@vivo.com/T/#mbda4f64a3532b32e061f4e8763bc8e307bea3ca8 Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Link: https://lore.kernel.org/r/20250428073831.19942-2-link@vivo.com Signed-off-by: Sasha Levin <sashal@kernel.org>