Re: linux-next build error "call to ‘__compiletime_assert_341’ declared with attribute error: BUILD_BUG_ON failed: __mlx5_bit_off(manage_pages_out, pas[i]) % 64"

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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On Tue, Aug 16, 2016 at 11:57:23AM -0700, Vinson Lee wrote:
> Hi.
> 
> Commit a533ed5e179c "net/mlx5: Pages management commands via mlx5 ifc"
> introduced this build error with GCC 4.4.

Hi Vinson,

Fenggauang reported this issue a couple of days before [1] and from our
investigation, we didn't find any reason for such failure [2]. It is
caused for specific compiler for structure which is aligned.

Any suggestions?

> 
>   CC [M]  drivers/net/ethernet/mellanox/mlx5/core/pagealloc.o
> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c: In function
> ‘reclaim_pages_cmd.clone.0’:
> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c:341: error: call
> to ‘__compiletime_assert_341’ declared with attribute error:
> BUILD_BUG_ON failed: __mlx5_bit_off(manage_pages_out, pas[i]) % 64
> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c: In function ‘give_pages’:
> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c:290: error: call
> to ‘__compiletime_assert_290’ declared with attribute error:
> BUILD_BUG_ON failed: __mlx5_bit_off(manage_pages_in, pas[i]) % 64
> make[5]: *** [drivers/net/ethernet/mellanox/mlx5/core/pagealloc.o] Error 1

[1] https://lists.01.org/pipermail/kbuild-all/2016-August/023040.html
[2] https://lists.01.org/pipermail/kbuild-all/2016-August/023050.html

> 
> Cheers,
> Vinson
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