netdev - Re: [PATCH] drivers/net/ethernet/sfc/: Simplify code

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Message-ID: <79eee958-818e-9fb4-6b61-4b510d040a64@gmail.com>
Date:   Mon, 22 Nov 2021 16:17:33 +0000
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Alejandro Colomar <alx.manpages@...il.com>, netdev@...r.kernel.org
Cc:     Martin Habets <habetsm.xilinx@...il.com>
Subject: Re: [PATCH] drivers/net/ethernet/sfc/: Simplify code

On 20/11/2021 20:14, Alejandro Colomar wrote:
> That ternary operator has
> the same exact code in both of the branches.
> 
> Unless there's some hidden magic in the condition,
> there's no reason for it to be,
> and it can be replaced
> by the code in one of the branches.
> 
> That code has been untouched since it was added,
> so there's no information in git about
> why it was written that way.
> 
> Signed-off-by: Alejandro Colomar <alx.manpages@...il.com>
> Cc: Edward Cree <ecree.xilinx@...il.com>
> Cc: Martin Habets <habetsm.xilinx@...il.com>
> Cc: netdev@...r.kernel.org

I guess it's there for type-checking — essentially as an assert that
 field_type == typeof(efx_##source_name.field).  Probably when it was
 added there was no standard way to do this; now we could probably
 use <linux/typecheck.h> or some such.
The comment just above the macro does mention "with type-checking".

-ed