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Date: Fri, 14 Feb 2020 10:44:46 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Arnd Bergmann <arnd@...db.de>, Adhemerval Zanella <adhemerval.zanella@...aro.org>, Saeed Mahameed <saeedm@...lanox.com>, Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org, linux-rdma@...r.kernel.org Subject: [PATCH AUTOSEL 5.5 294/542] mlx5: work around high stack usage with gcc From: Arnd Bergmann <arnd@...db.de> [ Upstream commit 42ae1a5c76691928ed217c7e40269db27f5225e9 ] In some configurations, gcc tries too hard to optimize this code: drivers/net/ethernet/mellanox/mlx5/core/en_stats.c: In function 'mlx5e_grp_sw_update_stats': drivers/net/ethernet/mellanox/mlx5/core/en_stats.c:302:1: error: the frame size of 1336 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] As was stated in the bug report, the reason is that gcc runs into a corner case in the register allocator that is rather hard to fix in a good way. As there is an easy way to work around it, just add a comment and the barrier that stops gcc from trying to overoptimize the function. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92657 Cc: Adhemerval Zanella <adhemerval.zanella@...aro.org> Signed-off-by: Arnd Bergmann <arnd@...db.de> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/ethernet/mellanox/mlx5/core/en_stats.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c index 9f09253f9f466..a05158472ed11 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c @@ -297,6 +297,9 @@ static void mlx5e_grp_sw_update_stats(struct mlx5e_priv *priv) s->tx_tls_drop_bypass_req += sq_stats->tls_drop_bypass_req; #endif s->tx_cqes += sq_stats->cqes; + + /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92657 */ + barrier(); } } } -- 2.20.1
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