mlx4: avoid large stack usage in mlx4_init_hca()

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The mlx4_dev_cap and mlx4_init_hca_param are really too large
to be put on the kernel stack, as shown by this clang warning:

drivers/net/ethernet/mellanox/mlx4/main.c:3304:12: error: stack frame size of 1088 bytes in function 'mlx4_load_one' [-Werror,-Wframe-larger-than=]

With gcc, the problem is the same, but it does not warn because
it does not inline this function, and therefore stays just below
the warning limit, while clang is just above it.

Use kzalloc for dynamic allocation instead of putting them
on stack. This gets the combined stack frame down to 424 bytes.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Arnd Bergmann 2019-07-22 17:01:55 +02:00 • committed by David S. Miller

parent 7c116e02a4

commit 9eed21c01c

1 changed files with 39 additions and 27 deletions

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drivers/net/ethernet/mellanox/mlx4/main.c

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