IB/core: Drop WARN_ON() from ib_umem_find_best_pgsz()

The WARN_ON() issued as part of ib_umem_find_best_pgsz() blocked cases
when only page sizes larger than PAGE_SIZE were set, drop it to enable
those cases.

In addition, there is no need to have a specific check for zero
pgsz_bitmap, the function will do its job and return 0 at the end if
nothing match will be found.

Link: https://lore.kernel.org/r/20210304130501.1102577-2-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 2dde99a..2cd6464 100644 (file)
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -100,10 +100,6 @@ unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
         */
        pgsz_bitmap &= GENMASK(BITS_PER_LONG - 1, PAGE_SHIFT);
 
-       /* At minimum, drivers must support PAGE_SIZE or smaller */
-       if (WARN_ON(!(pgsz_bitmap & GENMASK(PAGE_SHIFT, 0))))
-               return 0;
-
        umem->iova = va = virt;
        /* The best result is the smallest page size that results in the minimum
         * number of required pages. Compute the largest page size that could