linux-kernel - Re: [PATCH v2 3/4] memory: tegra124-emc: Fix compilation warnings on 64bit platforms

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Message-ID: <936cfc7d-737e-a582-ea60-ad2ba5b4ca72@canonical.com>
Date:   Mon, 17 May 2021 07:28:31 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Mikko Perttunen <mperttunen@...dia.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 3/4] memory: tegra124-emc: Fix compilation warnings on
 64bit platforms

On 16/05/2021 12:12, Dmitry Osipenko wrote:
> Fix compilation warning on 64bit platforms caused by implicit promotion
> of 32bit signed integer to a 64bit unsigned value which happens after
> enabling compile-testing of the driver.
> 
> Suggested-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/memory/tegra/tegra124-emc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
> index 5699d909abc2..c9eb948cf4df 100644
> --- a/drivers/memory/tegra/tegra124-emc.c
> +++ b/drivers/memory/tegra/tegra124-emc.c
> @@ -272,8 +272,8 @@
>  #define EMC_PUTERM_ADJ				0x574
>  
>  #define DRAM_DEV_SEL_ALL			0
> -#define DRAM_DEV_SEL_0				(2 << 30)
> -#define DRAM_DEV_SEL_1				(1 << 30)
> +#define DRAM_DEV_SEL_0				(2u << 30)
> +#define DRAM_DEV_SEL_1				(1u << 30)

Why not using BIT()? This would make even this 2<<30 less awkard...

Best regards,
Krzysztof