linux-kernel - Re: [PATCH] net: sparx5: fix bitmask check

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Date:   Mon, 2 Aug 2021 08:02:05 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sparx5: fix bitmask check

On Mon,  2 Aug 2021 16:54:37 +0200 Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Older compilers such as gcc-5.5 produce a warning in this driver
> when ifh_encode_bitfield() is not getting inlined:
> 
> drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c: In function 'ifh_encode_bitfield':
> include/linux/compiler_types.h:333:38: error: call to '__compiletime_assert_545' declared with attribute error: Unsupported width, must be <= 40
> drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c:28:2: note: in expansion of macro 'compiletime_assert'
>   compiletime_assert(width <= 40, "Unsupported width, must be <= 40");
>   ^
> 
> Mark the function as __always_inline to make the check work correctly
> on all compilers. 

I fixed this by moving the check out to a macro wrapper in net:
6387f65e2acb ("net: sparx5: fix compiletime_assert for GCC 4.9")

> To make this also work on 32-bit architectures, change
> the GENMASK() to GENMASK_ULL().

Would you mind resending just that part against net/master?

> Fixes: f3cad2611a77 ("net: sparx5: add hostmode with phylink support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>