4.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arnd Bergmann arnd@arndb.de
[ Upstream commit 1b19b95169cd52fe82cd442fec0b279fe25cc838 ]
A warning that I thought I had fixed before occasionally comes back in rare randconfig builds (I found 7 instances in the last 100000 builds, originally it was much more frequent):
drivers/infiniband/hw/mlx5/mr.c: In function 'mlx5_ib_reg_user_mr': drivers/infiniband/hw/mlx5/mr.c:1229:5: error: 'order' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (order <= mr_cache_max_order(dev)) { ^ drivers/infiniband/hw/mlx5/mr.c:1247:8: error: 'ncont' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/infiniband/hw/mlx5/mr.c:1247:8: error: 'page_shift' may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/infiniband/hw/mlx5/mr.c:1260:2: error: 'npages' may be used uninitialized in this function [-Werror=maybe-uninitialized]
I've looked at all those findings again and noticed that they are all with CONFIG_INFINIBAND_USER_MEM=n, which means ib_umem_get() returns an error unconditionally and we never initialize or use those variables. This triggers a condition in gcc iff mr_umem_get() is partially but not entirely inlined, which in turn depends on the exact combination of optimization settings. This is a known problem with gcc, with no easy solution in the compiler, so this adds another workaround that should be more reliable than my previous attempt.
Returning an error from mlx5_ib_reg_user_mr() earlier means that we can completely bypass the logic that caused the warning, the compiler can now see that the variable is never accessed.
Fixes: 14ab8896f5d9 ("IB/mlx5: avoid bogus -Wmaybe-uninitialized warning") Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/infiniband/hw/mlx5/mr.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1206,6 +1206,9 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct int err; bool use_umr = true;
+ if (!IS_ENABLED(CONFIG_INFINIBAND_USER_MEM)) + return ERR_PTR(-EINVAL); + mlx5_ib_dbg(dev, "start 0x%llx, virt_addr 0x%llx, length 0x%llx, access_flags 0x%x\n", start, virt_addr, length, access_flags);