netdev - RE: [PATCH net-next] mlx5: Add MLX5_SET64_VCHK to fix BUILD_BUG

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Date:   Tue, 11 Oct 2016 10:50:07 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Tom Herbert' <tom@...bertland.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>
CC:     "kernel-team@...com" <kernel-team@...com>
Subject: RE: [PATCH net-next] mlx5: Add MLX5_SET64_VCHK to fix BUILD_BUG_ON

From: Tom Herbert
> Sent: 11 October 2016 05:22
...
> Fix is to create MLX5_SET64_VCHK that takes an additional argument
> that is a constant. There are two callers of MLX5_SET64 that are
> trying to get a variable offset, change those to call MLX5_SET64_VCHK
> passing pas[0] as the argument to use in the offset check.

I think I'd separate the array index instead.
Something like:

#define MLX5_SET64_INDEXED(typ, p, fld, ndx, v) do { \
	BUILD_BUG_ON(__mlx5_bit_off(typ, fld) % 64); \
	__MLX5_SET64(typ, p, fld[ndx], v); \
} while (0)

	David