nvme: Fixes u64 division which breaks i386 builds
Uses div_u64 for u64 division and round_down, a bitwise operation,
instead of rounddown, which uses a modulus.
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 82b4ffb..666e994f 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1454,8 +1454,9 @@
unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size);
if (q_size_aligned * nr_io_queues > dev->cmb_size) {
- q_depth = rounddown(dev->cmb_size / nr_io_queues,
- dev->page_size) / entry_size;
+ u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
+ mem_per_q = round_down(mem_per_q, dev->page_size);
+ q_depth = div_u64(mem_per_q, entry_size);
/*
* Ensure the reduced q_depth is above some threshold where it