[PATCH] nvme-pci: another 64-bit division for the host memory buffer code

[Christoph Hellwig]

[to be folded into "nvme-pci: implement host memory buffer support"]

Signed-off-by: Christoph Hellwig <hch at lst.de>

---

Now tested with a full i386 build, sigh..
---
 drivers/nvme/host/pci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 788bb2c479d0..4b50fef1fa1b 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1591,12 +1591,14 @@ static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
 	struct nvme_host_mem_buf_desc *descs;
 	u32 chunk_size, max_entries, i = 0;
 	void **bufs;
-	u64 size;
+	u64 size, tmp;
 
 	/* start big and work our way down */
 	chunk_size = min(preferred, (u64)PAGE_SIZE << MAX_ORDER);
 retry:
-	max_entries = DIV_ROUND_UP(preferred, chunk_size);
+	tmp = (preferred + chunk_size - 1);
+	do_div(tmp, chunk_size);
+	max_entries = tmp;
 	descs = kcalloc(max_entries, sizeof(*descs), GFP_KERNEL);
 	if (!descs)
 		goto out;
-- 
2.11.0